Completed the todo tests

Author: Maryanne-K

Sprint-2/implement/contains.test.js

@@ -16,22 +16,29 @@ as the object doesn't contains a key of 'c'
 // Given a contains function
 // When passed an object and a property name
 // Then it should return true if the object contains the property, false otherwise
-test.todo("contains returns true for existing property");
-test.todo("contains returns false for non-existent property");
+test("contains returns true for existing property");
+expect (contains({a: 1, b: 2}, 'a')).toBe(true);
+
+test("contains returns false for non-existent property");
+expect (contains({a: 1, b: 2}, 'c')).toBe(false);
 // Given an empty object
 // When passed to contains
 // Then it should return false
-test.todo("contains on empty object returns false");
+test("contains returns false for empty object");
+expect (contains({}, 'a')).toBe(false);
 
 // Given an object with properties
 // When passed to contains with an existing property name
 // Then it should return true
-test.todo("contains returns true for existing property");
+test("contains returns true for existing property");
+expect (contains({a: 1, b: 2}, 'a')).toBe(true);
 // Given an object with properties
 // When passed to contains with a non-existent property name
 // Then it should return false
-test.todo("contains returns false for non-existent property");
+test("contains returns false for non-existent property");
+expect (contains({a: 1, b: 2}, 'c')).toBe(false);
 // Given invalid parameters like an array
 // When passed to contains
 // Then it should return false or throw an error
-test.todo("contains with invalid parameters returns false or throws error");
+test("contains with invalid parameters returns false or throws error");
+expect (contains([1, 2, 3], 'a')).toBe(false);