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ASTextKitTests.mm
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136 lines (111 loc) · 4.86 KB
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/* 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 <UIKit/UIKit.h>
#import <XCTest/XCTest.h>
#import <FBSnapshotTestCase/FBSnapshotTestController.h>
#import "ASTextKitAttributes.h"
#import "ASTextKitRenderer.h"
@interface ASTextKitTests : XCTestCase
@end
static UITextView *UITextViewWithAttributes(const ASTextKitAttributes &attributes, const CGSize constrainedSize)
{
UITextView *textView = [[UITextView alloc] initWithFrame:{ .size = constrainedSize }];
textView.backgroundColor = [UIColor clearColor];
textView.textContainer.lineBreakMode = attributes.lineBreakMode;
textView.textContainer.lineFragmentPadding = 0.f;
textView.textContainer.maximumNumberOfLines = attributes.maximumNumberOfLines;
textView.textContainerInset = UIEdgeInsetsZero;
textView.layoutManager.usesFontLeading = NO;
textView.attributedText = attributes.attributedString;
return textView;
}
static UIImage *UITextViewImageWithAttributes(const ASTextKitAttributes &attributes, const CGSize constrainedSize)
{
UITextView *textView = UITextViewWithAttributes(attributes, constrainedSize);
UIGraphicsBeginImageContextWithOptions(constrainedSize, NO, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
{
[textView.layer renderInContext:context];
}
CGContextRestoreGState(context);
UIImage *snapshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return snapshot;
}
static UIImage *ASTextKitImageWithAttributes(const ASTextKitAttributes &attributes, const CGSize constrainedSize)
{
ASTextKitRenderer *renderer = [[ASTextKitRenderer alloc] initWithTextKitAttributes:attributes
constrainedSize:constrainedSize];
UIGraphicsBeginImageContextWithOptions(constrainedSize, NO, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
{
[renderer drawInContext:context bounds:{.size = constrainedSize}];
}
CGContextRestoreGState(context);
UIImage *snapshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return snapshot;
}
static BOOL checkAttributes(const ASTextKitAttributes &attributes, const CGSize constrainedSize)
{
FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] init];
UIImage *labelImage = UITextViewImageWithAttributes(attributes, constrainedSize);
UIImage *textKitImage = ASTextKitImageWithAttributes(attributes, constrainedSize);
return [controller compareReferenceImage:labelImage toImage:textKitImage error:nil];
}
@implementation ASTextKitTests
- (void)testSimpleStrings
{
ASTextKitAttributes attributes {
.attributedString = [[NSAttributedString alloc] initWithString:@"hello" attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:12]}]
};
XCTAssert(checkAttributes(attributes, { 100, 100 }));
}
- (void)testChangingAPropertyChangesHash
{
NSAttributedString *as = [[NSAttributedString alloc] initWithString:@"hello" attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:12]}];
ASTextKitAttributes attrib1 {
.attributedString = as,
.lineBreakMode = NSLineBreakByClipping,
};
ASTextKitAttributes attrib2 {
.attributedString = as,
};
XCTAssertNotEqual(attrib1.hash(), attrib2.hash(), @"Hashes should differ when NSLineBreakByClipping changes.");
}
- (void)testSameStringHashesSame
{
ASTextKitAttributes attrib1 {
.attributedString = [[NSAttributedString alloc] initWithString:@"hello" attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:12]}],
};
ASTextKitAttributes attrib2 {
.attributedString = [[NSAttributedString alloc] initWithString:@"hello" attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:12]}],
};
XCTAssertEqual(attrib1.hash(), attrib2.hash(), @"Hashes should be the same!");
}
- (void)testStringsWithVariableAttributes
{
NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:@"hello" attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:12]}];
for (int i = 0; i < attrStr.length; i++) {
// Color each character something different
CGFloat factor = ((CGFloat)i) / ((CGFloat)attrStr.length);
[attrStr addAttribute:NSForegroundColorAttributeName
value:[UIColor colorWithRed:factor
green:1.0 - factor
blue:0.0
alpha:1.0]
range:NSMakeRange(i, 1)];
}
ASTextKitAttributes attributes {
.attributedString = attrStr
};
XCTAssert(checkAttributes(attributes, { 100, 100 }));
}
@end