added test for implementation of binaryStrLen function

test/conversionOfNumbers/test_conversionOfNumbers.c

@@ -39,3 +39,15 @@ void test_binaryStringLengthOfInput0is1(){
     //assert
     TEST_ASSERT_EQUAL_INT(expected, result);
 }
+
+void test_convert10ToBinaryStr(){
+    //arrange
+    char* result;
+    char expected[] = "1010";
+
+    //act
+    result = convertIntToBinaryStr(10);
+
+    //assert
+    TEST_ASSERT_EQUAL_STRING(expected, result);
+}