first commit

test_calculator.py

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+import pytest
+from calculator import add, subtract, multiply, divide
+
+def test_add():
+    assert add(2, 3) == 5
+    assert add(-1, 1) == 0
+    assert add(0, 0) == 0
+
+def test_subtract():
+    assert subtract(10, 4) == 6
+    assert subtract(0, 5) == -5
+
+def test_multiply():
+    assert multiply(3, 4) == 12
+    assert multiply(-2, 5) == -10
+    assert multiply(0, 100) == 0
+
+def test_divide():
+    assert divide(10, 2) == 5
+    assert divide(7, 2) == 3.5
+
+def test_divide_by_zero():
+    with pytest.raises(ValueError, match="Cannot divide by zero"):
+        divide(5, 0)
+