Add setting to AppRTCMobile for iOS, that can change capture resolution.

webrtc/examples/objc/AppRTCMobile/tests/ARDMediaConstraintsModelTests.mm

+/*
+ *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import <Foundation/Foundation.h>
+#import <OCMock/OCMock.h>
+#import "ARDMediaConstraintsModel+Private.h"
+#import "ARDMediaConstraintsSettingsStore.h"
+#import "WebRTC/RTCMediaConstraints.h"
+#include "webrtc/base/gunit.h"
+
+
+@interface ARDMediaConstraintsModelTests : NSObject {
+  ARDMediaConstraintsModel *_model;
+}
+
+- (void)testDefaultMediaFromStore;
+- (void)testWidthConstraintFromStore;
+- (void)testHeightConstraintFromStore;
+
+@end
+
+@implementation ARDMediaConstraintsModelTests
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    _model = [[ARDMediaConstraintsModel alloc] init];
+  }
+  return self;
+}
+
+- (id)setupMockStoreWithMediaConstraintString:(NSString *)constraintString {
+  id storeMock = [OCMockObject mockForClass:[ARDMediaConstraintsSettingsStore class]];
+  [([[storeMock stub] andReturn:constraintString]) videoResolutionConstraintsSetting];
+
+  id partialMock = [OCMockObject partialMockForObject:_model];
+  [[[partialMock stub] andReturn:storeMock] settingsStore];
+
+  return storeMock;
+}
+
+- (void)testDefaultMediaFromStore {
+  // given
+  id storeMock = [self setupMockStoreWithMediaConstraintString:nil];
+
+  [[storeMock expect] setVideoResolutionConstraintsSetting:@"640x480"];
+
+  // when
+  NSString *string = [_model currentVideoResoultionConstraintFromStore];
+
+  // then
+  EXPECT_TRUE([string isEqualToString:@"640x480"]);
+  [storeMock verify];
+}
+
+- (void)testWidthConstraintFromStore {
+  // given
+  [self setupMockStoreWithMediaConstraintString:@"1270x480"];
+
+  // when
+  NSString *width = [_model currentVideoResolutionWidthFromStore];
+
+  // then
+  EXPECT_TRUE([width isEqualToString:@"1270"]);
+}
+
+- (void)testHeightConstraintFromStore {
+  // given
+  [self setupMockStoreWithMediaConstraintString:@"960x540"];
+  // when
+  NSString *height = [_model currentVideoResolutionHeightFromStore];
+
+  // then
+  EXPECT_TRUE([height isEqualToString:@"540"]);
+}
+
+- (void)testConstraintComponentIsNilWhenInvalidConstraintString {
+  // given
+  [self setupMockStoreWithMediaConstraintString:@"invalid"];
+
+  // when
+  NSString *width = [_model currentVideoResolutionWidthFromStore];
+
+  // then
+  EXPECT_TRUE(width == nil);
+}
+
+- (void)testConstraintsDictionaryIsNilWhenInvalidConstraintString {
+  // given
+  [self setupMockStoreWithMediaConstraintString:@"invalid"];
+
+  // when
+  NSDictionary *constraintsDictionary = [_model currentMediaConstraintFromStoreAsRTCDictionary];
+
+  // then
+  EXPECT_TRUE(constraintsDictionary == nil);
+}
+@end
+
+class ARDMediaConstraintsModelTest : public ::testing::Test {
+ protected:
+  ARDMediaConstraintsModelTests *test;
+  ARDMediaConstraintsModelTest() { test = [[ARDMediaConstraintsModelTests alloc] init]; }
+};
+
+TEST_F(ARDMediaConstraintsModelTest, DefaultMediaFromStore) {
+  @autoreleasepool {
+    [test testDefaultMediaFromStore];
+  }
+}
+
+TEST_F(ARDMediaConstraintsModelTest, WidthConstraintFromStore) {
+  @autoreleasepool {
+    [test testWidthConstraintFromStore];
+  }
+}
+
+TEST_F(ARDMediaConstraintsModelTest, HeightConstraintFromStore) {
+  @autoreleasepool {
+    [test testHeightConstraintFromStore];
+  }
+}
+
+TEST_F(ARDMediaConstraintsModelTest, ConstratintIsNil) {
+  @autoreleasepool {
+    [test testConstraintComponentIsNilWhenInvalidConstraintString];
+  }
+}
+
+TEST_F(ARDMediaConstraintsModelTest, DictionaryIsNil) {
+  @autoreleasepool {
+    [test testConstraintsDictionaryIsNilWhenInvalidConstraintString];
+  }
+}