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Add tests to confirm CALayer behaviors (#2184)
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Adlai Holler
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Sep 2, 2016
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| // | ||
| // ASCALayerTests.m | ||
| // AsyncDisplayKit | ||
| // | ||
| // Created by Adlai Holler on 9/2/16. | ||
| // Copyright © 2016 Facebook. All rights reserved. | ||
| // | ||
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| #import <XCTest/XCTest.h> | ||
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| #import <OCMock/OCMock.h> | ||
| #import <OCMock/NSInvocation+OCMAdditions.h> | ||
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| /** | ||
| * Tests that confirm what we know about Core Animation behavior. | ||
| * | ||
| * These tests are not run during the normal test action. You can run them yourself | ||
| * to investigate and confirm CA behavior. | ||
| */ | ||
| @interface ASCALayerTests : XCTestCase | ||
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| @end | ||
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| #define DeclareLayerAndSublayer() \ | ||
| CALayer *realSublayer = [CALayer layer]; \ | ||
| id layer = [OCMockObject partialMockForObject:[CALayer layer]]; \ | ||
| id sublayer = [OCMockObject partialMockForObject:realSublayer]; \ | ||
| [layer addSublayer:realSublayer]; | ||
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| @implementation ASCALayerTests | ||
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| - (void)testThatLayerBeginsWithCleanLayout | ||
| { | ||
| XCTAssertFalse([CALayer layer].needsLayout); | ||
| } | ||
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| - (void)testThatAddingSublayersDirtysLayout | ||
| { | ||
| CALayer *layer = [CALayer layer]; | ||
| [layer addSublayer:[CALayer layer]]; | ||
| XCTAssertTrue([layer needsLayout]); | ||
| } | ||
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| - (void)testThatRemovingSublayersDirtysLayout | ||
| { | ||
| DeclareLayerAndSublayer(); | ||
| [layer layoutIfNeeded]; | ||
| XCTAssertFalse([layer needsLayout]); | ||
| [sublayer removeFromSuperlayer]; | ||
| XCTAssertTrue([layer needsLayout]); | ||
| } | ||
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| - (void)testDirtySublayerLayoutDoesntDirtySuperlayer | ||
| { | ||
| DeclareLayerAndSublayer(); | ||
| [layer layoutIfNeeded]; | ||
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| // Dirtying sublayer doesn't dirty superlayer. | ||
| [sublayer setNeedsLayout]; | ||
| XCTAssertTrue([sublayer needsLayout]); | ||
| XCTAssertFalse([layer needsLayout]); | ||
| [[[sublayer expect] andForwardToRealObject] layoutSublayers]; | ||
| // NOTE: We specifically don't expect layer to get -layoutSublayers | ||
| [sublayer layoutIfNeeded]; | ||
| [sublayer verify]; | ||
| [layer verify]; | ||
| } | ||
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| - (void)testDirtySuperlayerLayoutDoesntDirtySublayerLayout | ||
| { | ||
| DeclareLayerAndSublayer(); | ||
| [layer layoutIfNeeded]; | ||
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| // Dirtying superlayer doesn't dirty sublayer. | ||
| [layer setNeedsLayout]; | ||
| XCTAssertTrue([layer needsLayout]); | ||
| XCTAssertFalse([sublayer needsLayout]); | ||
| [[[layer expect] andForwardToRealObject] layoutSublayers]; | ||
| // NOTE: We specifically don't expect sublayer to get -layoutSublayers | ||
| [layer layoutIfNeeded]; | ||
| [sublayer verify]; | ||
| [layer verify]; | ||
| } | ||
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| - (void)testDirtyHierarchyIsLaidOutTopDown | ||
| { | ||
| DeclareLayerAndSublayer(); | ||
| [sublayer setNeedsLayout]; | ||
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| XCTAssertTrue([layer needsLayout]); | ||
| XCTAssertTrue([sublayer needsLayout]); | ||
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| __block BOOL superlayerLaidOut = NO; | ||
| [[[[layer expect] andDo:^(NSInvocation *i) { | ||
| superlayerLaidOut = YES; | ||
| }] andForwardToRealObject] layoutSublayers]; | ||
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| [[[[sublayer expect] andDo:^(NSInvocation *i) { | ||
| XCTAssertTrue(superlayerLaidOut); | ||
| }] andForwardToRealObject] layoutSublayers]; | ||
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| [layer layoutIfNeeded]; | ||
| [sublayer verify]; | ||
| [layer verify]; | ||
| } | ||
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| @end |