diff --git a/test/test_operationHandler.c b/test/test_operationHandler.c
index 0a33c4a..1cdfb1d 100644
--- a/test/test_operationHandler.c
+++ b/test/test_operationHandler.c
@@ -25,4 +25,25 @@ void test_operationHandler_falsereturnvaluewithinvalidinput(void) {
     int expectedResult = 0;
     int result = checkOperationInput(8);
     TEST_ASSERT_EQUAL_INT(expectedResult, result);
+}
+
+void test_operationHandler_truereturnvaluewithformattedinput(void) {
+    int expectedResult = 1;
+    const char str[] = {'1', '4', ' ', '5', '6', '\0'};
+    int result = containsTwoNumbers(str);
+    TEST_ASSERT_EQUAL_INT(expectedResult, result);
+}
+
+void test_operationHandler_falsereturnvaluewithwronginput(void) {
+    int expectedResult = 0;
+    const char str[] = {'5', '6', '\0'};
+    int result = containsTwoNumbers(str);
+    TEST_ASSERT_EQUAL_INT(expectedResult, result);
+}
+
+void test_operationHandler_extractingFirstNumber(void) {
+    int expectedResult = 48;
+    char str[] = {'4', '8', ' ', '5', '\0'};
+    int result = extractFirstNumber(str);
+    TEST_ASSERT_EQUAL_INT(expectedResult, result);
 }
\ No newline at end of file