Add initial snapshot tests for ASWrapperSpec (#2482)

AsyncDisplayKit.xcodeproj/project.pbxproj

@@ -199,6 +199,7 @@
 		6959433E1D70815300B0EE1F /* ASDisplayNodeLayout.mm in Sources */ = {isa = PBXBuildFile; fileRef = 6959433C1D70815300B0EE1F /* ASDisplayNodeLayout.mm */; };
 		6959433F1D70815300B0EE1F /* ASDisplayNodeLayout.mm in Sources */ = {isa = PBXBuildFile; fileRef = 6959433C1D70815300B0EE1F /* ASDisplayNodeLayout.mm */; };
 		695943401D70815300B0EE1F /* ASDisplayNodeLayout.h in Headers */ = {isa = PBXBuildFile; fileRef = 6959433D1D70815300B0EE1F /* ASDisplayNodeLayout.h */; };
+		695BE2551DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm in Sources */ = {isa = PBXBuildFile; fileRef = 695BE2541DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm */; };
 		696FCB311D6E46050093471E /* ASBackgroundLayoutSpecSnapshotTests.mm in Sources */ = {isa = PBXBuildFile; fileRef = 696FCB301D6E46050093471E /* ASBackgroundLayoutSpecSnapshotTests.mm */; };
 		69708BA61D76386D005C3CF9 /* ASEqualityHashHelpers.h in Headers */ = {isa = PBXBuildFile; fileRef = 69708BA41D76386D005C3CF9 /* ASEqualityHashHelpers.h */; };
 		69708BA71D76386D005C3CF9 /* ASEqualityHashHelpers.mm in Sources */ = {isa = PBXBuildFile; fileRef = 69708BA51D76386D005C3CF9 /* ASEqualityHashHelpers.mm */; };
@@ -980,6 +981,7 @@
 		68FC85E81CE29C7D00EDD713 /* ASVisibilityProtocols.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ASVisibilityProtocols.m; sourceTree = "<group>"; };
 		6959433C1D70815300B0EE1F /* ASDisplayNodeLayout.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ASDisplayNodeLayout.mm; sourceTree = "<group>"; };
 		6959433D1D70815300B0EE1F /* ASDisplayNodeLayout.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASDisplayNodeLayout.h; sourceTree = "<group>"; };
+		695BE2541DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ASWrapperSpecSnapshotTests.mm; sourceTree = "<group>"; };
 		696FCB301D6E46050093471E /* ASBackgroundLayoutSpecSnapshotTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ASBackgroundLayoutSpecSnapshotTests.mm; sourceTree = "<group>"; };
 		69708BA41D76386D005C3CF9 /* ASEqualityHashHelpers.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = ASEqualityHashHelpers.h; path = TextKit/ASEqualityHashHelpers.h; sourceTree = "<group>"; };
 		69708BA51D76386D005C3CF9 /* ASEqualityHashHelpers.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = ASEqualityHashHelpers.mm; path = TextKit/ASEqualityHashHelpers.mm; sourceTree = "<group>"; };
@@ -1429,6 +1431,7 @@
 				052EE06A1A15A0D8002C6279 /* TestResources */,
 				2538B6F21BC5D2A2003CA0B4 /* ASCollectionViewFlowLayoutInspectorTests.m */,
 				69FEE53C1D95A9AF0086F066 /* ASLayoutElementStyleTests.m */,
+				695BE2541DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm */,
 			);
 			path = AsyncDisplayKitTests;
 			sourceTree = "<group>";
@@ -2259,6 +2262,7 @@
 				CC3B208E1C3F7D0A00798563 /* ASWeakSetTests.m in Sources */,
 				F711994E1D20C21100568860 /* ASDisplayNodeExtrasTests.m in Sources */,
 				ACF6ED5D1B178DC700DA7C62 /* ASDimensionTests.mm in Sources */,
+				695BE2551DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm in Sources */,
 				CCA221D31D6FA7EF00AF6A0F /* ASViewControllerTests.m in Sources */,
 				058D0A38195D057000B7D73C /* ASDisplayLayerTests.m in Sources */,
 				2538B6F31BC5D2A2003CA0B4 /* ASCollectionViewFlowLayoutInspectorTests.m in Sources */,

AsyncDisplayKitTests/ASWrapperSpecSnapshotTests.mm

@@ -0,0 +1,60 @@
+//
+//  ASWrapperSpecSnapshotTests.mm
+//  AsyncDisplayKit
+//
+//  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+//
+
+
+#import "ASLayoutSpecSnapshotTestsHelper.h"
+#import "ASBackgroundLayoutSpec.h"
+
+@interface ASWrapperSpecSnapshotTests : ASLayoutSpecSnapshotTestCase
+@end
+
+@implementation ASWrapperSpecSnapshotTests
+
+- (void)setUp
+{
+  [super setUp];
+ 
+  self.recordMode = NO;
+}
+
+- (void)testWrapperSpecWithOneElementShouldSizeToElement
+{
+  ASDisplayNode *child = ASDisplayNodeWithBackgroundColor([UIColor redColor], {50, 50});
+  
+  ASSizeRange sizeRange = ASSizeRangeMake(CGSizeZero, CGSizeMake(INFINITY, INFINITY));
+  [self testWithChildren:@[child] sizeRange:sizeRange identifier:nil];
+}
+
+- (void)testWrapperSpecWithMultipleElementsShouldSizeToLargestElement
+{
+  ASDisplayNode *firstChild = ASDisplayNodeWithBackgroundColor([UIColor redColor], {50, 50});
+  ASDisplayNode *secondChild = ASDisplayNodeWithBackgroundColor([UIColor greenColor], {100, 100});
+  
+  ASSizeRange sizeRange = ASSizeRangeMake(CGSizeZero, CGSizeMake(INFINITY, INFINITY));
+  [self testWithChildren:@[secondChild, firstChild] sizeRange:sizeRange identifier:nil];
+}
+
+- (void)testWithChildren:(NSArray *)children sizeRange:(ASSizeRange)sizeRange identifier:(NSString *)identifier
+{
+  ASDisplayNode *backgroundNode = ASDisplayNodeWithBackgroundColor([UIColor whiteColor]);
+
+  NSMutableArray *subnodes = [NSMutableArray arrayWithArray:children];
+  [subnodes insertObject:backgroundNode atIndex:0];
+
+  ASLayoutSpec *layoutSpec =
+  [ASBackgroundLayoutSpec backgroundLayoutSpecWithChild:
+   [ASWrapperLayoutSpec
+    wrapperWithLayoutElements:children]
+   background:backgroundNode];
+  
+  [self testLayoutSpec:layoutSpec sizeRange:sizeRange subnodes:subnodes identifier:identifier];
+}
+
+@end