diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 5a5350b..604d972 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -34,13 +34,13 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install pandas==1.3.5 numpy==1.22.3 tqdm==4.62.3 psutil==5.9.0
+        pip install pytest
         pip install .
         
     - name: Test with pytest
       run: |
         cd tests
-        python global-unit-test.py
+        python -m pytest . -s --disable-warnings
   linting:
     needs: unit-tests
     
diff --git a/Makefile b/Makefile
index ab7f41a..168bbb7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 test:
-	cd tests && python global-unit-test.py
+	cd tests && python -m pytest . -s --disable-warnings
 
 lint:
 	python -m pylint chefboost/ --fail-under=10
\ No newline at end of file
diff --git a/chefboost/Chefboost.py b/chefboost/Chefboost.py
index bd9ef1e..9cf0e1a 100644
--- a/chefboost/Chefboost.py
+++ b/chefboost/Chefboost.py
@@ -24,6 +24,7 @@ def fit(
     config: Optional[dict] = None,
     target_label: str = "Decision",
     validation_df: Optional[pd.DataFrame] = None,
+    silent: bool = False,
 ) -> Dict[str, Any]:
     """
     Build (a) decision tree model(s)
@@ -55,6 +56,9 @@ def fit(
                 if nothing is passed to validation data frame, then the function validates
                 built trees for training data frame
 
+            silent (bool): set this to True if you do not want to see
+                any informative logs
+
     Returns:
             chefboost model
     """
@@ -139,7 +143,8 @@ def fit(
 
     if enableParallelism == True:
         num_cores = config["num_cores"]
-        logger.info(f"[INFO]: {num_cores} CPU cores will be allocated in parallel running")
+        if silent is False:
+            logger.info(f"[INFO]: {num_cores} CPU cores will be allocated in parallel running")
 
         from multiprocessing import set_start_method, freeze_support
 
@@ -169,7 +174,8 @@ def fit(
         config["algorithm"] = "Regression"
 
     if enableGBM == True:
-        logger.info("Gradient Boosting Machines...")
+        if silent is False:
+            logger.info("Gradient Boosting Machines...")
         algorithm = "Regression"
         config["algorithm"] = "Regression"
 
@@ -184,7 +190,8 @@ def fit(
 
     # -------------------------
 
-    logger.info(f"{algorithm} tree is going to be built...")
+    if silent is False:
+        logger.info(f"{algorithm} tree is going to be built...")
 
     # initialize a dictionary. this is going to be used to check features numeric or nominal.
     # numeric features should be transformed to nominal values based on scales.
@@ -212,7 +219,13 @@ def fit(
 
     if enableAdaboost == True:
         trees, alphas = adaboost_clf.apply(
-            df, config, header, dataset_features, validation_df=validation_df, process_id=process_id
+            df,
+            config,
+            header,
+            dataset_features,
+            validation_df=validation_df,
+            process_id=process_id,
+            silent=silent,
         )
 
     elif enableGBM == True:
@@ -224,6 +237,7 @@ def fit(
                 dataset_features,
                 validation_df=validation_df,
                 process_id=process_id,
+                silent=silent,
             )
             # classification = True
 
@@ -235,12 +249,19 @@ def fit(
                 dataset_features,
                 validation_df=validation_df,
                 process_id=process_id,
+                silent=silent,
             )
             # classification = False
 
     elif enableRandomForest == True:
         trees = randomforest.apply(
-            df, config, header, dataset_features, validation_df=validation_df, process_id=process_id
+            df,
+            config,
+            header,
+            dataset_features,
+            validation_df=validation_df,
+            process_id=process_id,
+            silent=silent,
         )
     else:  # regular decision tree building
         root = 1
@@ -264,8 +285,9 @@ def fit(
             main_process_id=process_id,
         )
 
-    logger.info("-------------------------")
-    logger.info(f"finished in {time.time() - begin} seconds")
+    if silent is False:
+        logger.info("-------------------------")
+        logger.info(f"finished in {time.time() - begin} seconds")
 
     obj = {"trees": trees, "alphas": alphas, "config": config, "nan_values": nan_values}
 
@@ -273,13 +295,13 @@ def fit(
 
     # train set accuracy
     df = base_df.copy()
-    evaluate(obj, df, task="train")
+    trainset_evaluation = evaluate(obj, df, task="train", silent=silent)
+    obj["evaluation"] = {"train": trainset_evaluation}
 
     # validation set accuracy
     if isinstance(validation_df, pd.DataFrame):
-        evaluate(obj, validation_df, task="validation")
-
-    # -----------------------------------------
+        validationset_evaluation = evaluate(obj, validation_df, task="validation", silent=silent)
+        obj["evaluation"]["validation"] = validationset_evaluation
 
     return obj
 
@@ -455,31 +477,38 @@ def restoreTree(module_name) -> Any:
     return functions.restoreTree(module_name)
 
 
-def feature_importance(rules: Union[str, list]) -> pd.DataFrame:
+def feature_importance(rules: Union[str, list], silent: bool = False) -> pd.DataFrame:
     """
     Show the feature importance values of a built model
     Args:
-            rules (str or list): e.g. decision_rules = "outputs/rules/rules.py"
+        rules (str or list): e.g. decision_rules = "outputs/rules/rules.py"
             or this could be retrieved from built model as shown below.
 
-                    decision_rules = []
-                    for tree in model["trees"]:
-                       rule = .__dict__["__spec__"].origin
-                       decision_rules.append(rule)
+            ```python
+            decision_rules = []
+            for tree in model["trees"]:
+               rule = .__dict__["__spec__"].origin
+               decision_rules.append(rule)
+            ```
+        silent (bool): set this to True if you do want to see
+            any informative logs.
     Returns:
             feature importance (pd.DataFrame)
     """
 
     if not isinstance(rules, list):
         rules = [rules]
-    logger.info(f"rules: {rules}")
+
+    if silent is False:
+        logger.info(f"rules: {rules}")
 
     # -----------------------------
 
     dfs = []
 
     for rule in rules:
-        logger.info("Decision rule: {rule}")
+        if silent is False:
+            logger.info(f"Decision rule: {rule}")
 
         with open(rule, "r", encoding="UTF-8") as file:
             lines = file.readlines()
@@ -564,8 +593,12 @@ def feature_importance(rules: Union[str, list]) -> pd.DataFrame:
 
 
 def evaluate(
-    model: dict, df: pd.DataFrame, target_label: str = "Decision", task: str = "test"
-) -> None:
+    model: dict,
+    df: pd.DataFrame,
+    target_label: str = "Decision",
+    task: str = "test",
+    silent: bool = False,
+) -> dict:
     """
     Evaluate the performance of a built model on a data set
     Args:
@@ -573,8 +606,10 @@ def evaluate(
         df (pandas data frame): data frame you would like to evaluate
         target_label (str): target label
         task (string): set this to train, validation or test
+        silent (bool): set this to True if you do not want to see
+            any informative logs
     Returns:
-        None
+        evaluation results (dict)
     """
 
     # --------------------------
@@ -598,4 +633,4 @@ def evaluate(
         df["Decision"] = df["Decision"].astype(str)
         df["Prediction"] = df["Prediction"].astype(str)
 
-    cb_eval.evaluate(df, task=task)
+    return cb_eval.evaluate(df, task=task, silent=silent)
diff --git a/chefboost/commons/evaluate.py b/chefboost/commons/evaluate.py
index 44eba39..2cb480d 100644
--- a/chefboost/commons/evaluate.py
+++ b/chefboost/commons/evaluate.py
@@ -1,4 +1,5 @@
 import math
+import pandas as pd
 from chefboost.commons.logger import Logger
 
 # pylint: disable=broad-except
@@ -6,25 +7,38 @@
 logger = Logger(module="chefboost/commons/evaluate.py")
 
 
-def evaluate(df, task="train"):
+def evaluate(df: pd.DataFrame, task: str = "train", silent: bool = False) -> dict:
+    """
+    Evaluate results
+    Args:
+        df (pd.DataFrame): data frame
+        task (str): train, test
+        silent (bool): set this to True if you do not want to
+            see any informative logs
+    Returns:
+        evaluation results (dict)
+    """
     if df["Decision"].dtypes == "object":
         problem_type = "classification"
     else:
         problem_type = "regression"
 
-    # -------------------------------------
-
+    evaluation_results = {}
     instances = df.shape[0]
 
-    logger.info("-------------------------")
-    logger.info(f"Evaluate {task} set")
-    logger.info("-------------------------")
+    if silent is False:
+        logger.info("-------------------------")
+        logger.info(f"Evaluate {task} set")
+        logger.info("-------------------------")
 
     if problem_type == "classification":
         idx = df[df["Prediction"] == df["Decision"]].index
         accuracy = 100 * len(idx) / df.shape[0]
-        logger.info(f"Accuracy: {accuracy}% on {instances} instances")
+        if silent is False:
+            logger.info(f"Accuracy: {accuracy}% on {instances} instances")
 
+        evaluation_results["Accuracy"] = accuracy
+        evaluation_results["Instances"] = instances
         # -----------------------------
 
         predictions = df.Prediction.values
@@ -48,8 +62,12 @@ def evaluate(df, task="train"):
                 confusion_row.append(item)
             confusion_matrix.append(confusion_row)
 
-        logger.info(f"Labels: {labels}")
-        logger.info(f"Confusion matrix: {confusion_matrix}")
+        if silent is False:
+            logger.info(f"Labels: {labels}")
+            logger.info(f"Confusion matrix: {confusion_matrix}")
+
+        evaluation_results["Labels"] = labels
+        evaluation_results["Confusion matrix"] = confusion_matrix
 
         # -----------------------------
         # precision and recall
@@ -79,11 +97,19 @@ def evaluate(df, task="train"):
             accuracy = round(100 * (tp + tn) / (tp + tn + fp + fn + epsilon), 4)
 
             if len(labels) >= 3:
-                logger.info(f"Decision {decision_class}")
-                logger.info(f"Accuray: {accuracy}")
+                if silent is False:
+                    logger.info(f"Decision {decision_class}")
+                    logger.info(f"Accuracy: {accuracy}")
+
+                evaluation_results[f"Decision {decision_class}'s Accuracy"] = accuracy
 
-            logger.info(f"Precision: {precision}%, Recall: {recall}%, F1: {f1_score}%")
-            logger.debug(f"TP: {tp}, TN: {tn}, FP: {fp}, FN: {fn}")
+            if silent is False:
+                logger.info(f"Precision: {precision}%, Recall: {recall}%, F1: {f1_score}%")
+                logger.debug(f"TP: {tp}, TN: {tn}, FP: {fp}, FN: {fn}")
+
+            evaluation_results["Precision"] = precision
+            evaluation_results["Recall"] = recall
+            evaluation_results["F1"] = f1_score
 
             if len(labels) < 3:
                 break
@@ -99,13 +125,17 @@ def evaluate(df, task="train"):
 
         if instances > 0:
             mae = df["Absolute_Error"].sum() / instances
-            logger.info(f"MAE: {mae}")
-
             mse = df["Absolute_Error_Squared"].sum() / instances
-            logger.info(f"MSE: {mse}")
-
             rmse = math.sqrt(mse)
-            logger.info(f"RMSE: {rmse}")
+
+            evaluation_results["MAE"] = mae
+            evaluation_results["MSE"] = mse
+            evaluation_results["RMSE"] = rmse
+
+            if silent is False:
+                logger.info(f"MAE: {mae}")
+                logger.info(f"MSE: {mse}")
+                logger.info(f"RMSE: {rmse}")
 
             rae = 0
             rrse = 0
@@ -122,12 +152,26 @@ def evaluate(df, task="train"):
             except Exception as err:
                 logger.error(str(err))
 
-            logger.info(f"RAE: {rae}")
-            logger.info(f"RRSE {rrse}")
+            if silent is False:
+                logger.info(f"RAE: {rae}")
+                logger.info(f"RRSE {rrse}")
+
+            evaluation_results["RAE"] = rae
+            evaluation_results["RRSE"] = rrse
 
             mean = df["Decision"].mean()
-            logger.info(f"Mean: {mean}")
+
+            if silent is False:
+                logger.info(f"Mean: {mean}")
+
+            evaluation_results["Mean"] = mean
 
             if mean > 0:
-                logger.info(f"MAE / Mean: {100 * mae / mean}%")
-                logger.info(f"RMSE / Mean: {100 * rmse / mean}%")
+                if silent is False:
+                    logger.info(f"MAE / Mean: {100 * mae / mean}%")
+                    logger.info(f"RMSE / Mean: {100 * rmse / mean}%")
+
+                evaluation_results["MAE / Mean"] = 100 * mae / mean
+                evaluation_results["RMSE / Mean"] = 100 * rmse / mean
+
+    return evaluation_results
diff --git a/chefboost/training/Training.py b/chefboost/training/Training.py
index ee37ca7..b7c6e06 100644
--- a/chefboost/training/Training.py
+++ b/chefboost/training/Training.py
@@ -510,16 +510,10 @@ def buildDecisionTree(
     # add else condition in the decision tree
 
     if df.Decision.dtypes == "object":  # classification
-        pivot = pd.DataFrame(subdataset.Decision.value_counts()).reset_index()
-
-        if pd.__version__.split(".")[0] == "1":
-            pivot = pivot.rename(columns={"Decision": "Instances", "index": "Decision"})
-        else:  # if pd.__version__.split(".")[0] == "2":
-            pivot = pivot.rename(columns={"Decision": "Instances", "count": "Decision"})
-
-        pivot = pivot.sort_values(by=["Instances"], ascending=False).reset_index()
-
-        else_decision = f"return '{pivot.iloc[0].Decision}'"
+        pivot = pd.DataFrame(subdataset.Decision.value_counts()).sort_values(
+            by=["count"], ascending=False
+        )
+        else_decision = f"return '{str(pivot.iloc[0].name)}'"
 
         if enableParallelism != True:
             functions.storeRule(file, (functions.formatRule(root), "else:"))
@@ -669,7 +663,7 @@ def buildDecisionTree(
             # this is reguler decision tree. find accuracy here.
 
             module_name = "outputs/rules/rules"
-            myrules = load_module(module_name) # rules0
+            myrules = load_module(module_name)  # rules0
             models.append(myrules)
 
     return models
@@ -682,7 +676,7 @@ def findPrediction(row):
         params.append(row[j])
 
     module_name = "outputs/rules/rules"
-    myrules = load_module(module_name) # rules0
+    myrules = load_module(module_name)  # rules0
 
     prediction = myrules.findDecision(params)
     return prediction
diff --git a/chefboost/tuning/adaboost.py b/chefboost/tuning/adaboost.py
index cda488e..3623347 100644
--- a/chefboost/tuning/adaboost.py
+++ b/chefboost/tuning/adaboost.py
@@ -31,7 +31,9 @@ def findPrediction(row):
     return prediction
 
 
-def apply(df, config, header, dataset_features, validation_df=None, process_id=None):
+def apply(
+    df, config, header, dataset_features, validation_df=None, process_id=None, silent: bool = False
+):
     models = []
     alphas = []
 
@@ -53,8 +55,7 @@ def apply(df, config, header, dataset_features, validation_df=None, process_id=N
     best_epoch_idx = 0
     best_epoch_value = 1000000
 
-    # for i in range(0, num_of_weak_classifier):
-    pbar = tqdm(range(0, num_of_weak_classifier), desc="Adaboosting")
+    pbar = tqdm(range(0, num_of_weak_classifier), desc="Adaboosting", disable=silent)
     for i in pbar:
         worksheet["Decision"] = worksheet["Weight"] * worksheet["Decision"]
 
@@ -139,8 +140,8 @@ def apply(df, config, header, dataset_features, validation_df=None, process_id=N
         pbar.set_description(f"Epoch {i + 1}. Loss: {mae}. Process: ")
 
     # ------------------------------
-
-    logger.info(f"The best epoch is {best_epoch_idx} with the {best_epoch_value} MAE score")
+    if silent is False:
+        logger.info(f"The best epoch is {best_epoch_idx} with the {best_epoch_value} MAE score")
 
     models = models[0 : best_epoch_idx + 1]
     alphas = alphas[0 : best_epoch_idx + 1]
diff --git a/chefboost/tuning/gbm.py b/chefboost/tuning/gbm.py
index 95bb17f..85ac99b 100644
--- a/chefboost/tuning/gbm.py
+++ b/chefboost/tuning/gbm.py
@@ -1,4 +1,5 @@
 import gc
+from typing import Optional, Union
 
 import pandas as pd
 import numpy as np
@@ -14,7 +15,7 @@
 logger = Logger(module="chefboost/tuning/gbm.py")
 
 
-def findPrediction(row):
+def findPrediction(row: pd.Series) -> Union[str, float]:
     epoch = row["Epoch"]
     row = row.drop(labels=["Epoch"])
     columns = row.shape[0]
@@ -32,7 +33,15 @@ def findPrediction(row):
     return prediction
 
 
-def regressor(df, config, header, dataset_features, validation_df=None, process_id=None):
+def regressor(
+    df: pd.DataFrame,
+    config: dict,
+    header: str,
+    dataset_features: dict,
+    validation_df: Optional[pd.DataFrame] = None,
+    process_id: Optional[int] = None,
+    silent: bool = False,
+) -> list:
     models = []
 
     # we will update decisions in every epoch, this will be used to restore
@@ -69,10 +78,7 @@ def regressor(df, config, header, dataset_features, validation_df=None, process_
     best_epoch_idx = 0
     best_epoch_loss = 1000000
 
-    pbar = tqdm(range(1, epochs + 1), desc="Boosting")
-
-    # for index in range(1,epochs+1):
-    # for index in tqdm(range(1,epochs+1), desc='Boosting'):
+    pbar = tqdm(range(1, epochs + 1), desc="Boosting", disable=silent)
     for index in pbar:
         logger.debug(f"epoch {index} - ")
         loss = 0
@@ -155,22 +161,33 @@ def regressor(df, config, header, dataset_features, validation_df=None, process_
 
     # ---------------------------------
 
-    logger.info(f"The best epoch is {best_epoch_idx} with {best_epoch_loss} loss value")
+    if silent is False:
+        logger.info(f"The best epoch is {best_epoch_idx} with {best_epoch_loss} loss value")
     models = models[0:best_epoch_idx]
     config["epochs"] = best_epoch_idx
 
-    logger.info(
-        f"MSE of {num_of_instances} instances are boosted from {boosted_from}"
-        f"to {best_epoch_loss} in {epochs} epochs"
-    )
+    if silent is False:
+        logger.info(
+            f"MSE of {num_of_instances} instances are boosted from {boosted_from}"
+            f"to {best_epoch_loss} in {epochs} epochs"
+        )
 
     return models
 
 
-def classifier(df, config, header, dataset_features, validation_df=None, process_id=None):
+def classifier(
+    df: pd.DataFrame,
+    config: dict,
+    header: str,
+    dataset_features: dict,
+    validation_df: Optional[pd.DataFrame] = None,
+    process_id: Optional[int] = None,
+    silent: bool = False,
+) -> tuple:
     models = []
 
-    logger.info("gradient boosting for classification")
+    if silent is False:
+        logger.info("gradient boosting for classification")
 
     epochs = config["epochs"]
     enableParallelism = config["enableParallelism"]
@@ -182,7 +199,7 @@ def classifier(df, config, header, dataset_features, validation_df=None, process
 
     boosted_predictions = np.zeros([df.shape[0], len(classes)])
 
-    pbar = tqdm(range(0, epochs), desc="Boosting")
+    pbar = tqdm(range(0, epochs), desc="Boosting", disable=silent)
 
     # store actual set, we will use this to calculate loss
     actual_set = pd.DataFrame(np.zeros([df.shape[0], len(classes)]), columns=classes)
@@ -317,9 +334,11 @@ def classifier(df, config, header, dataset_features, validation_df=None, process
 
     # --------------------------------
 
-    logger.info(
-        f"The best accuracy got in {best_accuracy_idx} epoch with the score {best_accuracy_value}"
-    )
+    if silent is False:
+        logger.info(
+            f"The best accuracy got in {best_accuracy_idx} epoch"
+            f" with the score {best_accuracy_value}"
+        )
 
     models = models[0 : best_accuracy_idx * len(classes) + len(classes)]
 
diff --git a/chefboost/tuning/randomforest.py b/chefboost/tuning/randomforest.py
index d6dfe6e..a8a1c40 100644
--- a/chefboost/tuning/randomforest.py
+++ b/chefboost/tuning/randomforest.py
@@ -1,7 +1,9 @@
+from typing import Optional
 import multiprocessing
 from contextlib import closing
 
 from tqdm import tqdm
+import pandas as pd
 
 from chefboost.commons import functions
 from chefboost.training import Training
@@ -10,7 +12,15 @@
 # pylint: disable=unused-argument
 
 
-def apply(df, config, header, dataset_features, validation_df=None, process_id=None):
+def apply(
+    df: pd.DataFrame,
+    config: dict,
+    header: str,
+    dataset_features: dict,
+    validation_df: Optional[pd.DataFrame] = None,
+    process_id: Optional[int] = None,
+    silent: bool = False,
+):
     models = []
 
     num_of_trees = config["num_of_trees"]
@@ -24,9 +34,10 @@ def apply(df, config, header, dataset_features, validation_df=None, process_id=N
 
     input_params = []
 
-    pbar = tqdm(range(0, num_of_trees), desc="Bagging")
+    pbar = tqdm(range(0, num_of_trees), desc="Bagging", disable=silent)
     for i in pbar:
-        pbar.set_description(f"Sub decision tree {i + 1} is processing")
+        if silent is False:
+            pbar.set_description(f"Sub decision tree {i + 1} is processing")
         subset = df.sample(frac=1 / num_of_trees)
 
         root = 1
@@ -38,7 +49,19 @@ def apply(df, config, header, dataset_features, validation_df=None, process_id=N
 
         if parallelism_on:  # parallel run
             input_params.append(
-                (subset, root, file, config, dataset_features, 0, 0, "root", i, None, process_id)
+                (
+                    subset,
+                    root,
+                    file,
+                    config,
+                    dataset_features,
+                    0,
+                    0,
+                    "root",
+                    i,
+                    None,
+                    process_id,
+                )
             )
 
         else:  # serial run
@@ -75,7 +98,7 @@ def apply(df, config, header, dataset_features, validation_df=None, process_id=N
 
             # all functions registered here
             # results = []
-            for f in tqdm(funclist):
+            for f in tqdm(funclist, disable=silent):
                 _ = f.get(timeout=100000)  # this was branch_results
                 # results.append(branch_results)
 
diff --git a/tests/__pycache__/test_adaboost.cpython-38-pytest-7.1.2.pyc b/tests/__pycache__/test_adaboost.cpython-38-pytest-7.1.2.pyc
new file mode 100644
index 0000000..5469e37
Binary files /dev/null and b/tests/__pycache__/test_adaboost.cpython-38-pytest-7.1.2.pyc differ
diff --git a/tests/__pycache__/test_c45.cpython-38-pytest-7.1.2.pyc b/tests/__pycache__/test_c45.cpython-38-pytest-7.1.2.pyc
new file mode 100644
index 0000000..83ddd63
Binary files /dev/null and b/tests/__pycache__/test_c45.cpython-38-pytest-7.1.2.pyc differ
diff --git a/tests/__pycache__/test_cart.cpython-38-pytest-7.1.2.pyc b/tests/__pycache__/test_cart.cpython-38-pytest-7.1.2.pyc
new file mode 100644
index 0000000..8a45a50
Binary files /dev/null and b/tests/__pycache__/test_cart.cpython-38-pytest-7.1.2.pyc differ
diff --git a/tests/__pycache__/test_chaid.cpython-38-pytest-7.1.2.pyc b/tests/__pycache__/test_chaid.cpython-38-pytest-7.1.2.pyc
new file mode 100644
index 0000000..1a9c50c
Binary files /dev/null and b/tests/__pycache__/test_chaid.cpython-38-pytest-7.1.2.pyc differ
diff --git a/tests/__pycache__/test_gbm.cpython-38-pytest-7.1.2.pyc b/tests/__pycache__/test_gbm.cpython-38-pytest-7.1.2.pyc
new file mode 100644
index 0000000..5e9d7c0
Binary files /dev/null and b/tests/__pycache__/test_gbm.cpython-38-pytest-7.1.2.pyc differ
diff --git a/tests/__pycache__/test_id3.cpython-38-pytest-7.1.2.pyc b/tests/__pycache__/test_id3.cpython-38-pytest-7.1.2.pyc
new file mode 100644
index 0000000..f6454ca
Binary files /dev/null and b/tests/__pycache__/test_id3.cpython-38-pytest-7.1.2.pyc differ
diff --git a/tests/__pycache__/test_randomforest.cpython-38-pytest-7.1.2.pyc b/tests/__pycache__/test_randomforest.cpython-38-pytest-7.1.2.pyc
new file mode 100644
index 0000000..f961ab0
Binary files /dev/null and b/tests/__pycache__/test_randomforest.cpython-38-pytest-7.1.2.pyc differ
diff --git a/tests/__pycache__/test_regression.cpython-38-pytest-7.1.2.pyc b/tests/__pycache__/test_regression.cpython-38-pytest-7.1.2.pyc
new file mode 100644
index 0000000..4991e46
Binary files /dev/null and b/tests/__pycache__/test_regression.cpython-38-pytest-7.1.2.pyc differ
diff --git a/tests/global-unit-test.py b/tests/global-unit-test.py
deleted file mode 100644
index a519828..0000000
--- a/tests/global-unit-test.py
+++ /dev/null
@@ -1,339 +0,0 @@
-import gc
-import pandas as pd
-from chefboost import Chefboost as cb
-from chefboost.commons.logger import Logger
-
-pd.set_option("display.max_rows", 500)
-pd.set_option("display.max_columns", 500)
-pd.set_option("display.width", 1000)
-
-logger = Logger(module="tests/global-unit-test.py")
-
-# ----------------------------------------------
-
-parallelism_cases = [True]
-# parallelism_cases = [False]
-# parallelism_cases = [False, True]
-
-if __name__ == "__main__":
-
-    for enableParallelism in parallelism_cases:
-
-        logger.info("*************************")
-        logger.info(f"enableParallelism is set to {enableParallelism}")
-        logger.info("*************************")
-
-        logger.info("no config passed")
-        df = pd.read_csv("dataset/golf.txt")
-        model = cb.fit(df)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("Validation set case")
-
-        df = pd.read_csv("dataset/golf.txt")
-        validation_df = pd.read_csv("dataset/golf.txt")
-        config = {"algorithm": "ID3", "enableParallelism": enableParallelism}
-        model = cb.fit(df, config, validation_df=validation_df)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("Feature importance")
-        # decision_rules = model["trees"][0].__dict__["__name__"]+".py"
-        decision_rules = model["trees"][0].__dict__["__spec__"].origin
-        logger.info(cb.feature_importance(decision_rules))
-
-        logger.info("-------------------------")
-
-        logger.info("ID3 for nominal features and nominal target:")
-        df = pd.read_csv("dataset/golf.txt")
-
-        config = {"algorithm": "ID3", "enableParallelism": enableParallelism}
-        model = cb.fit(df, config)
-
-        validation_df = pd.read_csv("dataset/golf.txt")
-
-        logger.info("External validation")
-        cb.evaluate(model, validation_df)
-
-        cb.save_model(model)
-        logger.info("built model is saved to model.pkl")
-
-        restored_model = cb.load_model("model.pkl")
-        logger.info("built model is restored from model.pkl")
-
-        instance = ["Sunny", "Hot", "High", "Weak"]
-        prediction = cb.predict(restored_model, instance)
-
-        logger.info(f"prediction for {instance} is {prediction}")
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("ID3 for nominal/numeric features and nominal target:")
-        config = {"algorithm": "ID3", "enableParallelism": enableParallelism}
-        model = cb.fit(pd.read_csv("dataset/golf2.txt"), config)
-
-        instance = ["Sunny", 85, 85, "Weak"]
-        prediction = cb.predict(model, instance)
-        logger.info(f"prediction for {instance} is {prediction}")
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("C4.5 for nominal/numeric features and nominal target:")
-        config = {"algorithm": "C4.5", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/golf2.txt"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("CART for nominal/numeric features and nominal target:")
-        config = {"algorithm": "CART", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/golf2.txt"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("CHAID for nominal features and nominal target:")
-        config = {"algorithm": "CHAID", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/golf.txt"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("CHAID for nominal/numeric features and nominal target:")
-        config = {"algorithm": "CHAID", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/golf2.txt"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("regression tree for nominal features, numeric target")
-        config = {"algorithm": "Regression", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/golf3.txt"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("regression tree for nominal/numeric features, numeric target")
-        config = {"algorithm": "Regression", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/golf4.txt"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info(
-            "algorithm must be regression tree for numetic target. set any other algorithm."
-        )
-        config = {"algorithm": "ID3", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/golf4.txt"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("ID3 for nominal features and target (large data set)")
-        config = {"algorithm": "ID3", "enableParallelism": enableParallelism}
-        model = cb.fit(pd.read_csv("dataset/car.data"), config)
-
-        instance = ["vhigh", "vhigh", 2, "2", "small", "low"]
-        prediction = cb.predict(model, instance)
-        logger.info(prediction)
-
-        instance = ["high", "high", "4", "more", "big", "high"]
-        prediction = cb.predict(model, instance)
-        logger.info(prediction)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("C4.5 for nominal features and target (large data set)")
-        config = {"algorithm": "C4.5", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/car.data"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("CART for nominal features and target (large data set)")
-        config = {"algorithm": "CART", "enableParallelism": enableParallelism}
-        cb.fit(pd.read_csv("dataset/car.data"), config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("CHAID for nominal features and target (large data set)")
-        config = {"algorithm": "CHAID", "enableParallelism": enableParallelism}
-        df = pd.read_csv("dataset/car.data")
-        cb.fit(df, config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("Iris with regular decision tree")
-        config = {"algorithm": "ID3"}
-        df = pd.read_csv(
-            "dataset/iris.data",
-            names=["Sepal length", "Sepal width", "Petal length", "Petal width", "Decision"],
-        )
-        model = cb.fit(df, config)
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("Adaboost")
-        config = {
-            "algorithm": "ID3",
-            "enableAdaboost": True,
-            "num_of_weak_classifier": 10,
-            "enableParallelism": False,
-        }
-        df = pd.read_csv("dataset/adaboost.txt")
-        validation_df = df.copy()
-
-        model = cb.fit(df, config, validation_df=validation_df)
-
-        instance = [4, 3.5]
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("Regular GBM")
-        config = {
-            "algorithm": "CART",
-            "enableGBM": True,
-            "epochs": 10,
-            "learning_rate": 1,
-            "enableParallelism": enableParallelism,
-        }
-        df = pd.read_csv("dataset/golf4.txt")
-        validation_df = pd.read_csv("dataset/golf4.txt")
-        model = cb.fit(df, config, validation_df=validation_df)
-
-        instance = ["Sunny", 85, 85, "Weak"]
-        prediction = cb.predict(model, instance)
-        logger.info(f"prediction for {instance} is {prediction}")
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("GBM for classification")
-        config = {
-            "algorithm": "ID3",
-            "enableGBM": True,
-            "epochs": 10,
-            "learning_rate": 1,
-            "enableParallelism": enableParallelism,
-        }
-
-        df = pd.read_csv(
-            "dataset/iris.data",
-            names=["Sepal length", "Sepal width", "Petal length", "Petal width", "Decision"],
-        )
-        validation_df = df.copy()
-
-        model = cb.fit(df, config, validation_df=validation_df)
-
-        instance = [7.0, 3.2, 4.7, 1.4]
-        prediction = cb.predict(model, instance)
-        logger.info(f"prediction for {instance} is {prediction}")
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("Random forest")
-        config = {
-            "algorithm": "ID3",
-            "enableRandomForest": True,
-            "num_of_trees": 3,
-            "enableParallelism": enableParallelism,
-        }
-        df = pd.read_csv("dataset/car.data")
-        validation_df = pd.read_csv("dataset/car.data")
-        model = cb.fit(
-            pd.read_csv("dataset/car.data"),
-            config
-            # , validation_df = validation_df
-        )
-
-        logger.info("Feature importance of random forest")
-        decision_rules = []
-        for tree in model["trees"]:
-
-            decision_rule = tree.__dict__["__spec__"].origin
-            decision_rules.append(decision_rule)
-
-        df = cb.feature_importance(decision_rules)
-        logger.info(df)
-
-        instance = ["vhigh", "vhigh", 2, "2", "small", "low"]
-
-        prediction = cb.predict(model, instance)
-        logger.info(f"prediction for {instance} is {prediction}")
-
-        instance = ["high", "high", 4, "more", "big", "high"]
-
-        prediction = cb.predict(model, instance)
-        logger.info(f"prediction for {instance} is {prediction}")
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("Random forest for regression")
-
-        config = {
-            "algorithm": "ID3",
-            "enableRandomForest": True,
-            "num_of_trees": 5,
-            "enableMultitasking": False,
-            "enableParallelism": enableParallelism,
-        }
-
-        df = pd.read_csv("dataset/car_reg.data")
-        model = cb.fit(pd.read_csv("dataset/car_reg.data"), config)
-
-        validation_df = pd.read_csv("dataset/car_reg.data")
-        cb.evaluate(model, validation_df)
-
-        instance = ["high", "high", 4, "more", "big", "high"]
-        prediction = cb.predict(model, instance)
-        logger.info(f"prediction for {instance} is {prediction}")
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-        logger.info("Is there any none predictions?")
-        config = {"algorithm": "C4.5", "enableParallelism": enableParallelism}
-        model = cb.fit(pd.read_csv("dataset/none_train.txt"), config)
-        test_set = pd.read_csv("dataset/none_test.txt")
-        instance = test_set.iloc[3]
-        logger.info(f"{instance.values} -> {cb.predict(model, instance)}")
-
-        gc.collect()
-
-        logger.info("-------------------------")
-
-    logger.info("-------------------------")
-    logger.info("unit tests completed successfully...")
diff --git a/tests/test_adaboost.py b/tests/test_adaboost.py
new file mode 100644
index 0000000..25d928b
--- /dev/null
+++ b/tests/test_adaboost.py
@@ -0,0 +1,27 @@
+import pandas as pd
+from chefboost import Chefboost as cb
+from chefboost.commons.logger import Logger
+
+logger = Logger(module="tests/test_adaboost.py")
+
+
+def test_adaboost():
+    config = {
+        "algorithm": "Regression",
+        "enableAdaboost": True,
+        "num_of_weak_classifier": 10,
+        "enableParallelism": False,
+    }
+    df = pd.read_csv("dataset/adaboost.txt")
+    validation_df = df.copy()
+
+    model = cb.fit(df, config, validation_df=validation_df, silent=True)
+
+    instance = [4, 3.5]
+
+    prediction = cb.predict(model, instance)
+
+    assert prediction == -1
+    assert len(model["trees"]) > 1
+
+    logger.info("✅ adaboost model restoration test done")
diff --git a/tests/test_c45.py b/tests/test_c45.py
new file mode 100644
index 0000000..bec68ea
--- /dev/null
+++ b/tests/test_c45.py
@@ -0,0 +1,24 @@
+import pandas as pd
+from chefboost import Chefboost as cb
+from chefboost.commons.logger import Logger
+
+logger = Logger(module="tests/test_c45.py")
+
+
+def test_c45_for_nominal_features_and_nominal_target():
+    df = pd.read_csv("dataset/golf.txt")
+    model = cb.fit(df, config={"algorithm": "C4.5"}, silent=True)
+    assert model["config"]["algorithm"] == "C4.5"
+    logger.info("✅ build c4.5 for nominal and numeric features and nominal target test done")
+
+def test_c45_for_nominal_and_numeric_features_and_nominal_target():
+    df = pd.read_csv("dataset/golf2.txt")
+    model = cb.fit(df, config={"algorithm": "C4.5"}, silent=True)
+    assert model["config"]["algorithm"] == "C4.5"
+    logger.info("✅ build c4.5 for nominal and numeric features and nominal target test done")
+
+def test_large_dataset():
+    df = pd.read_csv("dataset/car.data")
+    model = cb.fit(df, config={"algorithm": "C4.5"}, silent=True)
+    assert model["config"]["algorithm"] == "C4.5"
+    logger.info("✅ build c4.5 for large dataset test done")
\ No newline at end of file
diff --git a/tests/test_cart.py b/tests/test_cart.py
new file mode 100644
index 0000000..8e1c6d9
--- /dev/null
+++ b/tests/test_cart.py
@@ -0,0 +1,25 @@
+import pandas as pd
+from chefboost import Chefboost as cb
+from chefboost.commons.logger import Logger
+
+logger = Logger(module="tests/test_cart.py")
+
+
+def test_cart_for_nominal_features_and_nominal_target():
+    df = pd.read_csv("dataset/golf.txt")
+    model = cb.fit(df, config={"algorithm": "CART"}, silent=True)
+    assert model["config"]["algorithm"] == "CART"
+    logger.info("✅ build cart for nominal and numeric features and nominal target test done")
+
+
+def test_cart_for_nominal_and_numeric_features_and_nominal_target():
+    df = pd.read_csv("dataset/golf2.txt")
+    model = cb.fit(df, config={"algorithm": "CART"}, silent=True)
+    assert model["config"]["algorithm"] == "CART"
+    logger.info("✅ build cart for nominal and numeric features and nominal target test done")
+
+def test_large_dataset():
+    df = pd.read_csv("dataset/car.data")
+    model = cb.fit(df, config={"algorithm": "CART"}, silent=True)
+    assert model["config"]["algorithm"] == "CART"
+    logger.info("✅ build c4.5 for large dataset test done")
\ No newline at end of file
diff --git a/tests/test_chaid.py b/tests/test_chaid.py
new file mode 100644
index 0000000..45fba69
--- /dev/null
+++ b/tests/test_chaid.py
@@ -0,0 +1,26 @@
+import pandas as pd
+from chefboost import Chefboost as cb
+from chefboost.commons.logger import Logger
+
+logger = Logger(module="tests/test_c45.py")
+
+
+def test_c45_for_nominal_features_and_nominal_target():
+    df = pd.read_csv("dataset/golf.txt")
+    model = cb.fit(df, config={"algorithm": "CHAID"}, silent=True)
+    assert model["config"]["algorithm"] == "CHAID"
+    logger.info("✅ build chaid for nominal features and nominal target test done")
+
+
+def test_c45_for_nominal_and_numeric_features_and_nominal_target():
+    df = pd.read_csv("dataset/golf2.txt")
+    model = cb.fit(df, config={"algorithm": "CHAID"}, silent=True)
+    assert model["config"]["algorithm"] == "CHAID"
+    logger.info("✅ build chaid for nominal and numeric features and nominal target test done")
+
+
+def test_large_dataset():
+    df = pd.read_csv("dataset/car.data")
+    model = cb.fit(df, config={"algorithm": "CHAID"}, silent=True)
+    assert model["config"]["algorithm"] == "CHAID"
+    logger.info("✅ build c4.5 for large dataset test done")
diff --git a/tests/test_gbm.py b/tests/test_gbm.py
new file mode 100644
index 0000000..6800f4c
--- /dev/null
+++ b/tests/test_gbm.py
@@ -0,0 +1,48 @@
+import pandas as pd
+from chefboost import Chefboost as cb
+from chefboost.commons.logger import Logger
+
+logger = Logger(module="tests/test_gbm.py")
+
+
+def test_gbm_regression():
+    config = {
+        "algorithm": "Regression",
+        "enableGBM": True,
+        "epochs": 10,
+        "learning_rate": 1,
+    }
+
+    df = pd.read_csv("dataset/golf4.txt")
+    validation_df = pd.read_csv("dataset/golf4.txt")
+
+    model = cb.fit(df, config, validation_df=validation_df, silent=True)
+    assert model["config"]["algorithm"] == "Regression"
+    assert len(model["trees"]) > 1
+
+    features = ["Sunny", 85, 85, "Weak"]
+    target = 25
+    prediction = cb.predict(model, features)
+    assert abs(prediction - target) < 1
+
+
+def test_gbm_classification():
+    config = {
+        "algorithm": "ID3",
+        "enableGBM": True,
+        "epochs": 10,
+        "learning_rate": 1,
+    }
+
+    df = pd.read_csv(
+        "dataset/iris.data",
+        names=["Sepal length", "Sepal width", "Petal length", "Petal width", "Decision"],
+    )
+    validation_df = df.copy()
+
+    model = cb.fit(df, config, validation_df=validation_df, silent=True)
+
+    instance = [7.0, 3.2, 4.7, 1.4]
+    target = "Iris-versicolor"
+    prediction = cb.predict(model, instance)
+    assert prediction == target
diff --git a/tests/test_id3.py b/tests/test_id3.py
new file mode 100644
index 0000000..d83cbf9
--- /dev/null
+++ b/tests/test_id3.py
@@ -0,0 +1,114 @@
+import pandas as pd
+from chefboost import Chefboost as cb
+from chefboost.commons.logger import Logger
+
+logger = Logger(module="tests/test_id3.py")
+
+
+def test_build_id3_with_no_config():
+    df = pd.read_csv("dataset/golf.txt")
+    model = cb.fit(df, silent=True)
+    assert model["config"]["algorithm"] == "ID3"
+    logger.info("✅ standard id3 test done")
+
+
+def test_build_id3_with_internal_validation_df():
+    df = pd.read_csv("dataset/golf.txt")
+    validation_df = pd.read_csv("dataset/golf.txt")
+
+    model = cb.fit(df, validation_df=validation_df, silent=True)
+
+    assert model["config"]["algorithm"] == "ID3"
+
+    validation_eval_results = model["evaluation"]["validation"]
+
+    assert validation_eval_results.get("Accuracy", 0) > 99
+    assert validation_eval_results.get("Precision", 0) > 99
+    assert validation_eval_results.get("Recall", 0) > 99
+    assert validation_eval_results.get("F1", 0) > 99
+    assert validation_eval_results.get("Instances", 0) == validation_df.shape[0]
+    assert "Confusion matrix" in validation_eval_results.keys()
+    assert "Labels" in validation_eval_results.keys()
+
+    # decision_rules = model["trees"][0].__dict__["__name__"]+".py"
+    decision_rules = model["trees"][0].__dict__["__spec__"].origin
+
+    fi_df = cb.feature_importance(decision_rules, silent=True)
+    assert fi_df.shape[0] == 4
+
+    logger.info("✅ id3 test with internal validation data frame done")
+
+
+def test_build_id3_with_external_validation_set():
+    df = pd.read_csv("dataset/golf.txt")
+    model = cb.fit(df, silent=True)
+
+    assert model["config"]["algorithm"] == "ID3"
+
+    validation_df = pd.read_csv("dataset/golf.txt")
+    results = cb.evaluate(model, validation_df, silent=True)
+
+    assert results.get("Accuracy", 0) > 99
+    assert results.get("Precision", 0) > 99
+    assert results.get("Recall", 0) > 99
+    assert results.get("F1", 0) > 99
+    assert results.get("Instances", 0) == validation_df.shape[0]
+    assert "Confusion matrix" in results.keys()
+    assert "Labels" in results.keys()
+
+    logger.info("✅ id3 test with external validation data frame done")
+
+
+def test_model_restoration():
+    df = pd.read_csv("dataset/golf.txt")
+    model = cb.fit(df, silent=True)
+    assert model["config"]["algorithm"] == "ID3"
+
+    cb.save_model(model)
+
+    restored_model = cb.load_model("model.pkl")
+
+    assert restored_model["config"]["algorithm"] == "ID3"
+
+    instance = ["Sunny", "Hot", "High", "Weak"]
+
+    prediction = cb.predict(restored_model, instance)
+    assert prediction == "No"
+
+    logger.info("✅ id3 model restoration test done")
+
+
+def test_build_id3_for_nominal_and_numeric_features_nominal_target():
+    df = pd.read_csv("dataset/golf2.txt")
+    model = cb.fit(df, silent=True)
+
+    assert model["config"]["algorithm"] == "ID3"
+
+    instance = ["Sunny", 85, 85, "Weak"]
+    prediction = cb.predict(model, instance)
+    assert prediction == "No"
+    logger.info("✅ build id3 for nominal and numeric features and nominal target test done")
+
+
+def test_large_data_set():
+    df = pd.read_csv("dataset/car.data")
+    model = cb.fit(df, silent=True)
+
+    assert model["config"]["algorithm"] == "ID3"
+
+    instance = ["vhigh", "vhigh", 2, "2", "small", "low"]
+    prediction = cb.predict(model, instance)
+    assert prediction == "unacc"
+
+    instance = ["high", "high", "4", "more", "big", "high"]
+    prediction = cb.predict(model, instance)
+    assert prediction == "acc"
+
+
+def test_iris_dataset():
+    df = pd.read_csv(
+        "dataset/iris.data",
+        names=["Sepal length", "Sepal width", "Petal length", "Petal width", "Decision"],
+    )
+    model = cb.fit(df, silent=True)
+    assert model["config"]["algorithm"] == "ID3"
diff --git a/tests/test_randomforest.py b/tests/test_randomforest.py
new file mode 100644
index 0000000..8068ee0
--- /dev/null
+++ b/tests/test_randomforest.py
@@ -0,0 +1,55 @@
+import pandas as pd
+from chefboost import Chefboost as cb
+from chefboost.commons.logger import Logger
+
+logger = Logger(module="tests/test_randomforest.py")
+
+
+def test_randomforest_for_classification():
+    config = {
+        "algorithm": "ID3",
+        "enableRandomForest": True,
+        "num_of_trees": 3,
+    }
+    df = pd.read_csv("dataset/car.data")
+
+    model = cb.fit(df, config, silent=True)
+
+    assert model["config"]["algorithm"] == "ID3"
+    assert model["evaluation"]["train"]["Accuracy"] > 90
+
+    # feature importance
+    decision_rules = []
+    for tree in model["trees"]:
+        decision_rule = tree.__dict__["__spec__"].origin
+        decision_rules.append(decision_rule)
+
+    df = cb.feature_importance(decision_rules, silent=True)
+    assert df.shape[0] == 6
+
+    # this is not in train data
+    instance = ["high", "high", 4, "more", "big", "high"]
+    prediction = cb.predict(model, instance)
+    assert prediction in ["unacc", "acc"]
+
+    instance = ["vhigh", "vhigh", 2, "2", "small", "low"]
+    prediction = cb.predict(model, instance)
+    assert prediction in ["unacc", "acc"]
+
+
+def test_randomforest_for_regression():
+    config = {
+        "algorithm": "ID3",
+        "enableRandomForest": True,
+        "num_of_trees": 5,
+    }
+    df = pd.read_csv("dataset/car_reg.data")
+    model = cb.fit(df, config, silent=True)
+
+    assert model["evaluation"]["train"]["MAE"] < 30
+    assert model["config"]["algorithm"] == "Regression"
+
+    instance = ["high", "high", 4, "more", "big", "high"]
+    target = 100
+    prediction = cb.predict(model, instance)
+    assert abs(prediction - target) < 30
diff --git a/tests/test_regression.py b/tests/test_regression.py
new file mode 100644
index 0000000..35ffea4
--- /dev/null
+++ b/tests/test_regression.py
@@ -0,0 +1,27 @@
+import pandas as pd
+from chefboost import Chefboost as cb
+from chefboost.commons.logger import Logger
+
+logger = Logger(module="tests/test_regression.py")
+
+
+def test_c45_for_nominal_features_and_numeric_target():
+    df = pd.read_csv("dataset/golf3.txt")
+    _ = cb.fit(df, config={"algorithm": "Regression"}, silent=True)
+    logger.info("✅ build regression for nominal features and numeric target test done")
+
+
+def test_c45_for_nominal_and_numeric_features_and_numeric_target():
+    df = pd.read_csv("dataset/golf4.txt")
+    _ = cb.fit(df, config={"algorithm": "Regression"}, silent=True)
+    logger.info(
+        "✅ build regression tree for nominal and numeric features and numeric target test done"
+    )
+
+
+def test_switching_to_regression_tree():
+    df = pd.read_csv("dataset/golf4.txt")
+    config = {"algorithm": "ID3"}
+    model = cb.fit(df, config, silent=True)
+    assert model["config"]["algorithm"] == "Regression"
+    logger.info("✅ switching to regression tree test done")