added test for binaryStrLen in case input is negative

test/conversionOfNumbers/test_conversionOfNumbers.c

@@ -50,4 +50,16 @@ void test_convert10ToBinaryStr1010(){
 
     //assert
     TEST_ASSERT_EQUAL_STRING(expected, result);
+}
+
+void test_binaryStringLengthOfInputNegative10is5(){
+    //arrange
+    int result;
+    int expected = 5;
+
+    //act
+    result = binaryStrLen(-10);
+
+    //assert
+    TEST_ASSERT_EQUAL_INT(expected, result);
 }