1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
  130
  131
  132
  133
  134
  135
  136
  137
  138
  139
  140
  141
  142
  143
  144
  145
  146
  147
  148
  149
  150
  151
  152
  153
  154


base / apple / scoped_objc_class_swizzler_unittest.mm [blame]

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#import "base/apple/scoped_objc_class_swizzler.h"

#import <Foundation/Foundation.h>

#include "testing/gtest/include/gtest/gtest.h"

@interface ObjCClassSwizzlerTestOne : NSObject
+ (NSInteger)function;
- (NSInteger)method;
- (NSInteger)modifier;
@end

@interface ObjCClassSwizzlerTestTwo : NSObject
+ (NSInteger)function;
- (NSInteger)method;
- (NSInteger)modifier;
@end

@implementation ObjCClassSwizzlerTestOne : NSObject

+ (NSInteger)function {
  return 10;
}

- (NSInteger)method {
  // Multiply by a modifier to ensure |self| in a swizzled implementation
  // refers to the original object.
  return 1 * [self modifier];
}

- (NSInteger)modifier {
  return 3;
}

@end

@implementation ObjCClassSwizzlerTestTwo : NSObject

+ (NSInteger)function {
  return 20;
}

- (NSInteger)method {
  return 2 * [self modifier];
}

- (NSInteger)modifier {
  return 7;
}

@end

@interface ObjCClassSwizzlerTestOne (AlternateCategory)
- (NSInteger)alternate;
@end

@implementation ObjCClassSwizzlerTestOne (AlternateCategory)
- (NSInteger)alternate {
  return 3 * [self modifier];
}
@end

@interface ObjCClassSwizzlerTestOneChild : ObjCClassSwizzlerTestOne
- (NSInteger)childAlternate;
@end

@implementation ObjCClassSwizzlerTestOneChild
- (NSInteger)childAlternate {
  return 5 * [self modifier];
}
@end

namespace base::apple {

TEST(ObjCClassSwizzlerTest, SwizzleInstanceMethods) {
  ObjCClassSwizzlerTestOne* object_one =
      [[ObjCClassSwizzlerTestOne alloc] init];
  ObjCClassSwizzlerTestTwo* object_two =
      [[ObjCClassSwizzlerTestTwo alloc] init];
  EXPECT_EQ(3, [object_one method]);
  EXPECT_EQ(14, [object_two method]);

  {
    base::apple::ScopedObjCClassSwizzler swizzler(
        [ObjCClassSwizzlerTestOne class], [ObjCClassSwizzlerTestTwo class],
        @selector(method));
    EXPECT_EQ(6, [object_one method]);
    EXPECT_EQ(7, [object_two method]);

    EXPECT_EQ(3, swizzler.InvokeOriginal<int>(object_one, @selector(method)));
  }

  EXPECT_EQ(3, [object_one method]);
  EXPECT_EQ(14, [object_two method]);
}

TEST(ObjCClassSwizzlerTest, SwizzleClassMethods) {
  EXPECT_EQ(10, [ObjCClassSwizzlerTestOne function]);
  EXPECT_EQ(20, [ObjCClassSwizzlerTestTwo function]);

  {
    base::apple::ScopedObjCClassSwizzler swizzler(
        [ObjCClassSwizzlerTestOne class], [ObjCClassSwizzlerTestTwo class],
        @selector(function));
    EXPECT_EQ(20, [ObjCClassSwizzlerTestOne function]);
    EXPECT_EQ(10, [ObjCClassSwizzlerTestTwo function]);

    EXPECT_EQ(10, swizzler.InvokeOriginal<int>([ObjCClassSwizzlerTestOne class],
                                               @selector(function)));
  }

  EXPECT_EQ(10, [ObjCClassSwizzlerTestOne function]);
  EXPECT_EQ(20, [ObjCClassSwizzlerTestTwo function]);
}

TEST(ObjCClassSwizzlerTest, SwizzleViaCategory) {
  ObjCClassSwizzlerTestOne* object_one =
      [[ObjCClassSwizzlerTestOne alloc] init];
  EXPECT_EQ(3, [object_one method]);

  {
    base::apple::ScopedObjCClassSwizzler swizzler(
        [ObjCClassSwizzlerTestOne class], @selector(method),
        @selector(alternate));
    EXPECT_EQ(9, [object_one method]);

    EXPECT_EQ(3, swizzler.InvokeOriginal<int>(object_one, @selector(method)));
  }

  EXPECT_EQ(3, [object_one method]);
}

TEST(ObjCClassSwizzlerTest, SwizzleViaInheritance) {
  ObjCClassSwizzlerTestOneChild* child =
      [[ObjCClassSwizzlerTestOneChild alloc] init];
  EXPECT_EQ(3, [child method]);

  {
    base::apple::ScopedObjCClassSwizzler swizzler(
        [ObjCClassSwizzlerTestOneChild class], @selector(method),
        @selector(childAlternate));
    EXPECT_EQ(15, [child method]);

    EXPECT_EQ(3, swizzler.InvokeOriginal<int>(child, @selector(method)));
  }

  EXPECT_EQ(3, [child method]);
}

}  // namespace base::apple