diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_helper_functions.py b/tests/test_helper_functions.py
new file mode 100644
index 0000000..406fd57
--- /dev/null
+++ b/tests/test_helper_functions.py
@@ -0,0 +1,8 @@
+# /tests/test_helper_functions.py
+import pytest
+from helper_functions import count_to_proportions
+
+def test_count_to_proportions():
+    counts_map = {"Class1": 20, "Class2": 30, "Class3": 50}
+    expected_proportions = {"Class1": 0.2, "Class2": 0.3, "Class3": 0.5}
+    assert count_to_proportions(counts_map) == expected_proportions
diff --git a/tests/test_proportions_controlling_ga.py b/tests/test_proportions_controlling_ga.py
new file mode 100644
index 0000000..09daa1e
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+++ b/tests/test_proportions_controlling_ga.py
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+# /tests/test_proportions_controlling_ga.py
+import pytest
+from proportions_controlling_GA import ProportionsControllingGA
+
+def test_pcga_initialization():
+    ga = ProportionsControllingGA(
+        chromosome_length=10,
+        containers_count_map={1: {"Class1": 15, "Class2": 10}},
+        optimal_proportions={"Class1": 0.4, "Class2": 0.6},
+        labels_penalties={"Class1": 1, "Class2": 1},
+        selection_threshold=1.0,
+        solution_threshold=0.1,
+        crossover_probability=0.9,
+        mutation_probability=0.1,
+        number_of_mutations_per_occurrence=1,
+        number_of_genes_per_mutation=1,
+        population_size=100,
+        max_iterations=100,
+        random_seed=42
+    )
+    assert ga is not None
+    # More assertions can be added to check the correct initialization of attributes
+
+
+def test_calculate_fitness_value():
+    # Example initialization parameters
+    chromosome_length = 10
+    containers_count_map = {
+        1: {"Class1": 15, "Class2": 10},
+        2: {"Class1": 8, "Class2": 20},
+
+        # ...
+    }
+    optimal_proportions = {"Class1": 0.4, "Class2": 0.6}
+    labels_penalties = {"Class1": 1, "Class2": 1}
+    
+    ga = ProportionsControllingGA(
+        chromosome_length=chromosome_length,
+        containers_count_map=containers_count_map,
+        optimal_proportions=optimal_proportions,
+        labels_penalties=labels_penalties,
+    )
+    
+    # Example chromosome for testing
+    # Make sure all elements in this list exist in containers_count_map
+    chromosome = [1, 2]  # Adjust this according to your data structure
+    fitness_value = ga._ProportionsControllingGA__calculate_fitness_value(chromosome)
+    assert isinstance(fitness_value, float)
+    # Add more assertions here if necessary
+
+