Testing a block of code or some method

Import the class, which contains the method to be tested.
Perform the operation with dummy data.
Now compare the result of operation with expected result.

- (void)testReverseString{
NSString *originalString = @"hi_my_name_is_siddharth";
NSString *reversedString = [self.someObject reverseString:originalString];
NSString *expectedReversedString = @"htrahddis_si_eman_ym_ih";
XCTAssertEqualObjects(expectedReversedString, reversedString, @"The reversed string did not match the expected reverse");
}

Feed the dummy data to the method under test if required & then compare the expected & actual results.

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