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ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item_unittest.mm

Index: ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item_unittest.mm
diff --git a/ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item_unittest.mm b/ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item_unittest.mm
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index 0000000000000000000000000000000000000000..970a3b58ed33ebdfbaf9d657438c159743d16244
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+++ b/ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item_unittest.mm
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gtest_mac.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+
+// Tests that the UILabels are set properly after a call to |configureCell:|.
+TEST(CollectionViewDetailItemTest, TextLabels) {
+  CollectionViewDetailItem* item =
+      [[CollectionViewDetailItem alloc] initWithType:0];
+  NSString* mainText = @"Main text";
+  NSString* detailText = @"Detail text";
+
+  item.text = mainText;
+  item.detailText = detailText;
+
+  id cell = [[[item cellClass] alloc] init];
+  ASSERT_TRUE([cell isMemberOfClass:[CollectionViewDetailCell class]]);
+
+  CollectionViewDetailCell* detailCell = cell;
+  EXPECT_FALSE(detailCell.textLabel.text);
+  EXPECT_FALSE(detailCell.detailTextLabel.text);
+
+  [item configureCell:cell];
+  EXPECT_NSEQ(mainText, detailCell.textLabel.text);
+  EXPECT_NSEQ(detailText, detailCell.detailTextLabel.text);
+}
+
+// Tests that each of the two text labels is provided with the correct amount
+// of space.
+TEST(CollectionViewDetailCellTest, TextLabelTargetWidths) {
+  // Make the cell 148 wide so that after allocating 3 * kHorizontalPadding (16)
+  // space for the margins and area between the labels, there is 100 available.
+  // Accordingly, in each of the cases below where the sum of the desired label
+  // widths exceeds 100, the sum of the constraints should equal 100.
+  CollectionViewDetailCell* cell = [[CollectionViewDetailCell alloc]
+      initWithFrame:CGRectMake(0, 0, 148, 100)];
+
+  CGRect textLabelRect = CGRectZero;
+  CGRect detailTextLabelRect = CGRectZero;
+
+  // If there is enough room for both, each should be allowed its full width.
+  textLabelRect.size.width = 50;
+  detailTextLabelRect.size.width = 40;
+  cell.textLabel.frame = textLabelRect;
+  cell.detailTextLabel.frame = detailTextLabelRect;
+  EXPECT_EQ(50, [cell textLabelTargetWidth]);
+  EXPECT_EQ(40, [cell detailTextLabelTargetWidth]);
+
+  // Even if there's only exactly enough room for both.
+  textLabelRect.size.width = 30;
+  detailTextLabelRect.size.width = 70;
+  cell.textLabel.frame = textLabelRect;
+  cell.detailTextLabel.frame = detailTextLabelRect;
+  EXPECT_EQ(30, [cell textLabelTargetWidth]);
+  EXPECT_EQ(70, [cell detailTextLabelTargetWidth]);
+
+  // And even if one of the labels is really big.
+  textLabelRect.size.width = 5;
+  detailTextLabelRect.size.width = 95;
+  cell.textLabel.frame = textLabelRect;
+  cell.detailTextLabel.frame = detailTextLabelRect;
+  EXPECT_EQ(5, [cell textLabelTargetWidth]);
+  EXPECT_EQ(95, [cell detailTextLabelTargetWidth]);
+
+  // But once they exceed the available width, start clipping the detail label.
+  textLabelRect.size.width = 51;
+  detailTextLabelRect.size.width = 50;
+  cell.textLabel.frame = textLabelRect;
+  cell.detailTextLabel.frame = detailTextLabelRect;
+  EXPECT_EQ(51, [cell textLabelTargetWidth]);
+  EXPECT_EQ(49, [cell detailTextLabelTargetWidth]);
+
+  textLabelRect.size.width = 25;
+  detailTextLabelRect.size.width = 90;
+  cell.textLabel.frame = textLabelRect;
+  cell.detailTextLabel.frame = detailTextLabelRect;
+  EXPECT_EQ(25, [cell textLabelTargetWidth]);
+  EXPECT_EQ(75, [cell detailTextLabelTargetWidth]);
+
+  textLabelRect.size.width = 70;
+  detailTextLabelRect.size.width = 50;
+  cell.textLabel.frame = textLabelRect;
+  cell.detailTextLabel.frame = detailTextLabelRect;
+  EXPECT_EQ(70, [cell textLabelTargetWidth]);
+  EXPECT_EQ(30, [cell detailTextLabelTargetWidth]);
+
+  // On the other hand, if the text label wants more than 75% of the width, clip
+  // it instead.
+  textLabelRect.size.width = 90;
+  detailTextLabelRect.size.width = 20;
+  cell.textLabel.frame = textLabelRect;
+  cell.detailTextLabel.frame = detailTextLabelRect;
+  EXPECT_EQ(80, [cell textLabelTargetWidth]);
+  EXPECT_EQ(20, [cell detailTextLabelTargetWidth]);
+
+  // If both want more than their guaranteed minimum (75 and 25), give them each
+  // the minimum.
+  textLabelRect.size.width = 90;
+  detailTextLabelRect.size.width = 50;
+  cell.textLabel.frame = textLabelRect;
+  cell.detailTextLabel.frame = detailTextLabelRect;
+  EXPECT_EQ(75, [cell textLabelTargetWidth]);
+  EXPECT_EQ(25, [cell detailTextLabelTargetWidth]);
+}
+
+}  // namespace