Update test_calculator.c

src/test/c/test_calculator.c

@@ -229,4 +229,14 @@ void test_additionbin(void) {
     // Assert
     TEST_ASSERT_EQUAL_INT64(10, result);
 }
+void test_multiplicationbin(void) {
+    // Arrange
+    long long int result;
+
+    // Act
+    result = multiplicationbin(1,10);
+
+    // Assert
+    TEST_ASSERT_EQUAL_INT64(10, result);
+}