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POOne unit test affects another
 

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  1. POOne unit test affects another
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    <p>I'm defining two functions:</p> <p>In <strong>mkgeometry_additions.h</strong></p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import &lt;MapKit/MapKit.h&gt; MKMapRect MKMapRectForCoordinateRegion(MKCoordinateRegion region); MKCoordinateRegion MKCoordinateRegionForSouthWestAndNorthEast(CLLocationCoordinate2D sw, CLLocationCoordinate2D ne); </code></pre> <p>In <strong>mkgeometry_additions.m</strong> (.m, even though they're c functions)</p> <pre><code>MKMapRect MKMapRectForCoordinateRegion(MKCoordinateRegion region) { CLLocationCoordinate2D center = region.center; MKCoordinateSpan span = region.span; CLLocationCoordinate2D topLeft = CLLocationCoordinate2DMake(center.latitude - span.latitudeDelta / 2.0, center.longitude - span.longitudeDelta / 2.0); CLLocationCoordinate2D bottomRight = CLLocationCoordinate2DMake(center.latitude - span.latitudeDelta / 2.0, center.longitude - span.longitudeDelta / 2.0); MKMapPoint mapPointTopLeft = MKMapPointForCoordinate(topLeft); MKMapPoint mapPointBottomRight = MKMapPointForCoordinate(bottomRight); double width = mapPointTopLeft.x - mapPointBottomRight.x; double height = mapPointTopLeft.y - mapPointBottomRight.y; return MKMapRectMake(mapPointTopLeft.x, mapPointTopLeft.y, width, height); } MKCoordinateRegion MKCoordinateRegionForSouthWestAndNorthEast(CLLocationCoordinate2D sw, CLLocationCoordinate2D ne) { MKCoordinateSpan span = MKCoordinateSpanMake(ne.latitude - sw.latitude, ne.longitude - sw.longitude); CLLocationCoordinate2D topLeft = CLLocationCoordinate2DMake(ne.latitude, sw.longitude); CLLocationCoordinate2D center = CLLocationCoordinate2DMake(topLeft.latitude + span.latitudeDelta * 0.5, topLeft.longitude + span.longitudeDelta * 0.5); return MKCoordinateRegionMake(center, span); } </code></pre> <p>That's pretty much the entirety of the two files.</p> <p>In my unit test with XCTests:</p> <pre><code>- (void)testMKMapRectForCoordinateRegionAfterReverseConversion { CLLocationCoordinate2D fremont = CLLocationCoordinate2DMake(37.54827, -121.98857); MKCoordinateRegion region = MKCoordinateRegionMake(fremont, MKCoordinateSpanMake(0.05, 0.05)); MKMapRect mapRect = MKMapRectForCoordinateRegion(region); MKCoordinateRegion derivedRegion = MKCoordinateRegionForMapRect(mapRect); double accuracy = 0.0001; XCTAssertEqualWithAccuracy(region.center.latitude, derivedRegion.center.latitude, accuracy, @"Latitude is equal"); XCTAssertEqualWithAccuracy(region.center.longitude, derivedRegion.center.longitude, accuracy, @"Latitude is equal"); XCTAssertEqualWithAccuracy(region.span.latitudeDelta, derivedRegion.span.latitudeDelta, accuracy, @"Latitude delta is equal"); XCTAssertEqualWithAccuracy(region.span.longitudeDelta, derivedRegion.span.longitudeDelta, accuracy, @"Latitude delta is equal"); } - (void)testMKCoordinateRegionForSouthWestAndNorthEast { CLLocationCoordinate2D taipeiWanHua = CLLocationCoordinate2DMake(25.02946, 121.49652); CLLocationCoordinate2D taipeiSongShan = CLLocationCoordinate2DMake(25.06640, 121.56166); /* When the following line is called, the first test fails */ MKCoordinateRegionForSouthWestAndNorthEast(taipeiWanHua, taipeiSongShan); /* I have the rest of the lines in this test commented out */ } </code></pre> <p>Now, I have empty setup and teardown for this test class. When I run the test. The first test fails if the third line of the second test is in the test. A closer look shows that when it fails, it's that the values are still similar but falling outside of the given accuracy: <img src="https://i.stack.imgur.com/vIg1q.png" alt="enter image description here"></p> <p>If I commented that third line of the second test out, the first test would pass. Why is that?</p>
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    1. UShuggie
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    1. COBTW, same thing happens even when I only run the first test. =/
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      1. UShuggie
 

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