diff --git a/.github/workflows/ruff.yml b/.github/workflows/ruff.yml
index 164630d..c12fb02 100644
--- a/.github/workflows/ruff.yml
+++ b/.github/workflows/ruff.yml
@@ -1,8 +1,18 @@
 name: Ruff
-on: [push, pull_request]
+on: push
 jobs:
-  ruff:
+  build:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: astral-sh/ruff-action@v3
+      - name: Install Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12.3"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install ruff
+      # Update output format to enable automatic inline annotations.
+      - name: Run Ruff
+        run: ruff check --output-format=github .
diff --git a/src/bin_search.py b/src/bin_search.py
index 713abfc..3c91f7d 100644
--- a/src/bin_search.py
+++ b/src/bin_search.py
@@ -1,6 +1,6 @@
 def binSearch(xs: list[int], x: int):
     left, right = 0, len(xs) - 1
-    while left < right:
+    while left <= right:
         mid = (left + right) // 2
         if xs[mid] == x:
             return mid
diff --git a/src/checksum.py b/src/checksum.py
index 74b4fb0..838002b 100644
--- a/src/checksum.py
+++ b/src/checksum.py
@@ -1,14 +1,32 @@
 def modulo11Checksum(ISBNNumber: str):
 
     digits = [int(char) for char in ISBNNumber if char.isdigit()]
-
+    
+    if len(digits) != 10:
+            print("Цифр должно быть 10", end=' - ')
+            return
+    
     checkDigit = digits[-1]
 
     total = 0
     for i in range(len(digits) - 1):
-        weight = 10
+        weight = 10 - i
         digit = digits[i]
         total += digit * weight
 
     checksum = total + checkDigit
     return checksum % 11 == 0
+    
+    
+num = input()
+
+while num != "-1":
+        res = modulo11Checksum(num)
+        
+        if res:
+                print("correct")
+                
+        else:
+                print("incorrect")
+        
+        num = input()
diff --git a/src/test_bin_search.py b/src/test_bin_search.py
new file mode 100644
index 0000000..e7b22b5
--- /dev/null
+++ b/src/test_bin_search.py
@@ -0,0 +1,36 @@
+from bin_search import binSearch
+import pytest
+import random
+
+
+def test_nothing():
+        ls = []
+        x = random.randint(-1000, 1000)
+        assert binSearch(ls, x) == -1
+        
+        
+def test_one():
+        ls = [2]
+        assert binSearch(ls, ls[0]) == 0
+        
+        
+def test_next():
+        ls = [1, 2, 3, 4, 5]
+        assert binSearch(ls, ls[3]) == 3
+        
+        
+def test_all():
+        ls = [x for x in range(0, 100)]
+        x = random.randint(0, 100)
+        
+        assert binSearch(ls, ls[x]) == x
+        
+def test_all2():
+        ls = [x for x in range(0, 100)]
+        x = random.randint(102, 1000)
+        
+        assert binSearch(ls, x) == -1
+
+        
+if __name__ == '__main__':
+    pytest.main()
diff --git a/src/test_checksum.py b/src/test_checksum.py
new file mode 100644
index 0000000..7b9d5fa
--- /dev/null
+++ b/src/test_checksum.py
@@ -0,0 +1,23 @@
+from checksum import modulo11Checksum
+import pytest
+
+def test1():
+        num = "99921-58-10-7"
+        assert modulo11Checksum(num) == True
+        
+        
+def test1_wrong():
+        num = "99921-58-10-4"
+        assert modulo11Checksum(num) == False
+        
+def test_wiki():
+        num = "2-266-11156-6"
+        assert modulo11Checksum(num) == True
+        
+        
+def test_wiki_wrong():
+        num = "2-266-11156-3"
+        assert modulo11Checksum(num) == False
+        
+if __name__ == '__main__':
+    pytest.main()