Add snapshot tests for ASStaticLayoutSpec.

AsyncDisplayKitTests/ASStaticLayoutSpecSnapshotTests.m

@@ -0,0 +1,85 @@
+//
+//  ASStaticLayoutSpecSnapshotTests.m
+//  AsyncDisplayKit
+//
+//  Created by Huy Nguyen on 18/10/15.
+//  Copyright (c) 2015 Facebook. All rights reserved.
+//
+
+#import "ASLayoutSpecSnapshotTestsHelper.h"
+
+#import "ASStaticLayoutSpec.h"
+#import "ASBackgroundLayoutSpec.h"
+
+@interface ASStaticLayoutSpecSnapshotTests : ASLayoutSpecSnapshotTestCase
+@end
+
+@implementation ASStaticLayoutSpecSnapshotTests
+
+- (void)setUp
+{
+  [super setUp];
+  self.recordMode = NO;
+}
+
+- (void)testSizingBehaviour
+{
+  [self testWithSizeRange:ASSizeRangeMake(CGSizeMake(150, 200), CGSizeMake(FLT_MAX, FLT_MAX))
+               identifier:@"underflowChildren"];
+  [self testWithSizeRange:ASSizeRangeMake(CGSizeZero, CGSizeMake(50, 100))
+               identifier:@"overflowChildren"];
+  // Expect the spec to wrap its content because children sizes are between constrained size
+  [self testWithSizeRange:ASSizeRangeMake(CGSizeZero, CGSizeMake(FLT_MAX / 2, FLT_MAX / 2))
+               identifier:@"wrappedChildren"];
+}
+
+- (void)testChildrenMeasuredWithAutoMaxSize
+{
+  ASStaticSizeDisplayNode *firstChild = ASDisplayNodeWithBackgroundColor([UIColor redColor]);
+  firstChild.layoutPosition = CGPointMake(0, 0);
+  firstChild.staticSize = CGSizeMake(50, 50);
+  
+  ASStaticSizeDisplayNode *secondChild = ASDisplayNodeWithBackgroundColor([UIColor blueColor]);
+  secondChild.layoutPosition = CGPointMake(10, 60);
+  secondChild.staticSize = CGSizeMake(100, 100);
+
+  ASSizeRange sizeRange = ASSizeRangeMake(CGSizeMake(10, 10), CGSizeMake(110, 160));
+  [self testWithChildren:@[firstChild, secondChild] sizeRange:sizeRange identifier:nil];
+  
+  XCTAssertTrue(ASSizeRangeEqualToSizeRange(firstChild.constrainedSizeForCalculatedLayout,
+                                            ASSizeRangeMake(CGSizeZero, sizeRange.max)));
+  CGSize secondChildMaxSize = CGSizeMake(sizeRange.max.width - secondChild.layoutPosition.x,
+                                         sizeRange.max.height - secondChild.layoutPosition.y);
+  XCTAssertTrue(ASSizeRangeEqualToSizeRange(secondChild.constrainedSizeForCalculatedLayout,
+                                            ASSizeRangeMake(CGSizeZero, secondChildMaxSize)));
+}
+
+- (void)testWithSizeRange:(ASSizeRange)sizeRange identifier:(NSString *)identifier
+{
+  ASDisplayNode *firstChild = ASDisplayNodeWithBackgroundColor([UIColor redColor]);
+  firstChild.layoutPosition = CGPointMake(0, 0);
+  firstChild.sizeRange = ASRelativeSizeRangeMakeWithExactCGSize(CGSizeMake(50, 50));
+  
+  
+  ASDisplayNode *secondChild = ASDisplayNodeWithBackgroundColor([UIColor blueColor]);
+  secondChild.layoutPosition = CGPointMake(0, 50);
+  secondChild.sizeRange = ASRelativeSizeRangeMakeWithExactCGSize(CGSizeMake(100, 100));
+  
+  [self testWithChildren:@[firstChild, secondChild] sizeRange:sizeRange identifier:identifier];
+}
+
+- (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];
+
+  ASStaticLayoutSpec *staticLayoutSpec = [ASStaticLayoutSpec staticLayoutSpecWithChildren:children];
+  ASLayoutSpec *layoutSpec = [ASBackgroundLayoutSpec backgroundLayoutSpecWithChild:staticLayoutSpec
+                                                                        background:backgroundNode];
+  
+  [self testLayoutSpec:layoutSpec sizeRange:sizeRange subnodes:subnodes identifier:identifier];
+}
+
+@end