Shared/CalculatorLogicTests.m

/*

     File: CalculatorLogicTests.m

 Abstract: This file implements the logic-test suite for the Calculator class.

  Version: 1.1

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

 Inc. ("Apple") in consideration of your agreement to the following

 terms, and your use, installation, modification or redistribution of

 this Apple software constitutes acceptance of these terms.  If you do

 not agree with these terms, please do not use, install, modify or

 redistribute this Apple software.

 In consideration of your agreement to abide by the following terms, and

 subject to these terms, Apple grants you a personal, non-exclusive

 license, under Apple's copyrights in this original Apple software (the

 "Apple Software"), to use, reproduce, modify and redistribute the Apple

 Software, with or without modifications, in source and/or binary forms;

 provided that if you redistribute the Apple Software in its entirety and

 without modifications, you must retain this notice and the following

 text and disclaimers in all such redistributions of the Apple Software.

 Neither the name, trademarks, service marks or logos of Apple Inc. may

 be used to endorse or promote products derived from the Apple Software

 without specific prior written permission from Apple.  Except as

 expressly stated in this notice, no other rights or licenses, express or

 implied, are granted by Apple herein, including but not limited to any

 patent rights that may be infringed by your derivative works or by other

 works in which the Apple Software may be incorporated.

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

 POSSIBILITY OF SUCH DAMAGE.

 Copyright (C) 2012 Apple Inc. All Rights Reserved.

 */

#import <SenTestingKit/SenTestingKit.h>

#import "Calculator.h"

@interface CalculatorLogicTests : SenTestCase {

@private

   Calculator *calculator;

}

@end

@implementation CalculatorLogicTests

/* The setUp method is called automatically before each test-case method (methods whose name starts with 'test').

 */

- (void) setUp {

   NSLog(@"%@ setUp", self.name);

   calculator = [[Calculator alloc] init];

   STAssertNotNil(calculator, @"Cannot create Calculator instance");

}

/* The tearDown method is called automatically after each test-case method (methods whose name starts with 'test').

 */

- (void) tearDown {

   NSLog(@"%@ tearDown", self.name);

}

/* testAddition performs a simple addition test: 6 + 2 = 8.

 * The test has two parts:

 * 1. Through the input: method, feed the calculator the characters 6, +, 2, and =.

 * 2. Confirm that displayValue is 8.

 */

- (void) testAddition {

   NSLog(@"%@ start", self.name);   // self.name is the name of the test-case method.

   [calculator input:@"6"];

   [calculator input:@"+"];

   [calculator input:@"2"];

   [calculator input:@"="];

   STAssertTrue([[calculator displayValue] isEqualToString:@"8"], @"");

   NSLog(@"%@ end", self.name);

}

/* testSubtraction performs a simple subtraction test: 19 - 2 = 17.

 * The test has two parts:

 * 1. Through the input: method, feed the calculator the characters 1, 9, -, 2, and =.

 * 2. Confirm that displayValue is 17.

 */

- (void) testSubtraction {

   NSLog(@"%@ start", self.name);   // Use NSLog to generate additional build-results output.

   [calculator input:@"1"];

   [calculator input:@"9"];

   [calculator input:@"-"];

   [calculator input:@"2"];

   [calculator input:@"="];

   STAssertTrue([[calculator displayValue] isEqualToString:@"17"], @"");

   NSLog(@"%@ end", self.name);

}

/* testDivision performs a simple division test: 19 / 8 = 2.375.

 * The test has two parts:

 * 1. Through the input: method, feed the calculator the characters 1, 9, /, 8, and =.

 * 2. Confirm that displayValue is 2.375.

 */

- (void) testDivision {

   NSLog(@"%@ start", self.name);

   [calculator input:@"1"];

   [calculator input:@"9"];

   [calculator input:@"/"];

   [calculator input:@"8"];

   [calculator input:@"="];

   STAssertTrue([[calculator displayValue] isEqualToString:@"2.375"], @"");

   NSLog(@"%@ end", self.name);

}

/* testMultiplication performs a simple multiplication test: 6 * 2 = 12.

 * The test has two parts:

 * 1. Through the input: method, feed the calculator the characters 6, *, 2, and =.

 * 2. Confirm that displayValue is 12.

 */

- (void) testMultiplication {

   NSLog(@"%@ start", self.name);

   [calculator input:@"6"];

   [calculator input:@"*"];

   [calculator input:@"2"];

   [calculator input:@"="];

   STAssertTrue([[calculator displayValue] isEqualToString:@"12"], @"");

   NSLog(@"%@ end", self.name);

}

/* testSubtractionNegativeResult performs a simple subtraction test with a negative result: 6 - 24 = -18.

 * The test has two parts:

 * 1. Through the input: method, feed the calculator the characters 6, -, 2, 4, and =.

 * 2. Confirm that displayValue is -18.

 */

- (void) testSubtractionNegativeResult {

   NSLog(@"%@ start", self.name);

   [calculator input:@"6"];

   [calculator input:@"-"];

   [calculator input:@"2"];

   [calculator input:@"4"];

   [calculator input:@"="];

   STAssertTrue([[calculator displayValue] isEqualToString:@"-18"], @"");

   NSLog(@"%@ end", self.name);

}

/* testClearLastEntry ensures that the clear (C) key clears the last entry when used once.

 */

- (void) testClearLastEntry {

   NSLog(@"%@ start", self.name);

   [calculator input:@"7"];

   [calculator input:@"+"];

   [calculator input:@"3"];

   [calculator input:@"C"];

   [calculator input:@"4"];

   [calculator input:@"="];   

   STAssertTrue([[calculator displayValue] isEqualToString:@"11"], @"");

   NSLog(@"%@ end", self.name);

}

/* testClearComputation ensures that the clear (C) key clears the computation when used twice.

 */

- (void) testClearComputation {

   NSLog(@"%@ start", self.name);

   [calculator input:@"C"];

   [calculator input:@"7"];

   [calculator input:@"+"];

   [calculator input:@"3"];

   [calculator input:@"C"];

   [calculator input:@"C"];

   STAssertTrue([[calculator displayValue] isEqualToString:@"0"], @"");   

   NSLog(@"%@ end", self.name);

}

/* testInputException ensures that the input: method throws an exception in three situations:

 * 1. The argument contains more than one character.

 * 2. The argument contains an invalid character.

 * 3. The argument is nil.

 */

- (void) testInputException {

   NSLog(@"%@ start", self.name);

    STAssertThrows([calculator input:@"67"], @"No exception for multicharacter input.");

    STAssertThrows([calculator input:@"j"],  @"No exception for invalid input.");

    STAssertThrows([calculator input:nil],   @"No exception for nil input.");

   NSLog(@"%@ end", self.name);

}

@end