firebase-ios-sdk/FirebasePerformance/Tests/Unit/Configurations/FPRConfigurationsTest.m

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#import <XCTest/XCTest.h>

#import <GoogleUtilities/GULUserDefaults.h>

#import "FirebasePerformance/Sources/Common/FPRConstants.h"

#import "FirebasePerformance/Sources/Configurations/FPRConfigurations+Private.h"
#import "FirebasePerformance/Sources/Configurations/FPRConfigurations.h"

#import "FirebasePerformance/Sources/Configurations/FPRRemoteConfigFlags+Private.h"
#import "FirebasePerformance/Sources/Configurations/FPRRemoteConfigFlags.h"

#import "FirebasePerformance/Tests/Unit/Configurations/FPRFakeRemoteConfig.h"

@interface FPRConfigurationsTest : XCTestCase

@end

@implementation FPRConfigurationsTest

- (GULUserDefaults *_Nonnull)makeEmptyUserDefaults {
  return [[GULUserDefaults alloc] init];
}

/** Validates if instance creation works. */
- (void)testInstanceCreation {
  XCTAssertNotNil([[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceNone]);
  XCTAssertNotNil([FPRConfigurations sharedInstance]);
}

/** Validates if singleton nature of the object works. */
- (void)testSingletonNature {
  XCTAssertEqualObjects([FPRConfigurations sharedInstance], [FPRConfigurations sharedInstance]);
}

/** Validates for the default value for the configurations. */
- (void)testDefaultValuesOfConfigs {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceNone];

#if defined(FPR_AUTOPUSH_ENDPOINT)
  XCTAssertEqual([configurations logSource], 461);
#else
  XCTAssertEqual([configurations logSource], 462);
#endif

  XCTAssertEqual([configurations diagnosticsEnabled], NO);
  XCTAssertEqual([configurations logTraceSamplingRate], 1.0);
  XCTAssertEqual([configurations logNetworkSamplingRate], 1.0);
  XCTAssertEqual([configurations foregroundEventCount], 300);
  XCTAssertEqual([configurations foregroundEventTimeLimit], 10);
  XCTAssertEqual([configurations backgroundEventCount], 30);
  XCTAssertEqual([configurations backgroundEventTimeLimit], 10);
  XCTAssertEqual([configurations foregroundNetworkEventCount], 700);
  XCTAssertEqual([configurations foregroundNetworkEventTimeLimit], 10);
  XCTAssertEqual([configurations backgroundNetworkEventCount], 70);
  XCTAssertEqual([configurations backgroundNetworkEventTimeLimit], 10);

  XCTAssertEqual([configurations sessionsSamplingPercentage], 1.0);
  XCTAssertEqual([configurations maxSessionLengthInMinutes], 240);
  XCTAssertEqual([configurations cpuSamplingFrequencyInForegroundInMS], 100.0);
  XCTAssertEqual([configurations cpuSamplingFrequencyInBackgroundInMS], 0.0);

  XCTAssertEqual([configurations memorySamplingFrequencyInForegroundInMS], 100.0);
  XCTAssertEqual([configurations memorySamplingFrequencyInBackgroundInMS], 0.0);
}

/** Validates if overrides work for diagnostics enabled. */
- (void)testOverridesForDiagnosticsEnabled {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configurations.userDefaults = userDefaults;

  XCTAssertFalse(configurations.diagnosticsEnabled);

  [userDefaults setBool:YES forKey:@"FPRDiagnosticsLocal"];
  XCTAssertTrue(configurations.diagnosticsEnabled);

  [userDefaults setBool:NO forKey:@"FPRDiagnosticsLocal"];
  XCTAssertFalse(configurations.diagnosticsEnabled);
}

/** Validates if Firebase Remote Config overrides work for trace sampling rate. */
- (void)testTraceSamplingRateRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  [configFlags resetCache];
  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_vc_trace_sampling_rate"];
  [userDefaults setObject:@(0.25) forKey:configKey];
  XCTAssertEqual([configurations logTraceSamplingRate], 0.25);

  [userDefaults setObject:@(1.0) forKey:configKey];
  XCTAssertEqual([configurations logTraceSamplingRate], 1.0);
  [configFlags resetCache];
}

/** Validates if Firebase Remote Config overrides work for network request sampling rate. */
- (void)testNetworkRequestSamplingRateRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  [configFlags resetCache];
  NSString *configKey = [NSString
      stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_vc_network_request_sampling_rate"];
  [userDefaults setObject:@(0.25) forKey:configKey];
  XCTAssertEqual([configurations logNetworkSamplingRate], 0.25);

  [userDefaults setObject:@(1.0) forKey:configKey];
  XCTAssertEqual([configurations logNetworkSamplingRate], 1.0);
  [configFlags resetCache];
}

/** Validates if Firebase Remote Config overrides work for session sampling rate. */
- (void)testSessionSamplingRateRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  [configFlags resetCache];
  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_vc_session_sampling_rate"];
  [userDefaults setObject:@(0.25) forKey:configKey];
  XCTAssertEqual([configurations sessionsSamplingPercentage], 25.00);

  [userDefaults setObject:@(1.0) forKey:configKey];
  XCTAssertEqual([configurations sessionsSamplingPercentage], 100.0);
  [configFlags resetCache];
}

/** Validates if Plist overrides work for session sampling rate. */
- (void)testSessionSamplingRatePlistOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  [configFlags resetCache];
  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_vc_session_sampling_rate"];
  [userDefaults setObject:@(0.25) forKey:configKey];
  XCTAssertEqual([configurations sessionsSamplingPercentage], 25.00);

  NSDictionary<NSString *, id> *infoDictionary = configurations.infoDictionary;
  configurations.infoDictionary = @{@"sessionsSamplingPercentage" : @(1.00)};
  XCTAssertEqual([configurations sessionsSamplingPercentage], 1.00);
  configurations.infoDictionary = infoDictionary;

  XCTAssertEqual([configurations sessionsSamplingPercentage], 25.00);
  [configFlags resetCache];
}

/** Validates if Firebase Remote Config overrides work for log source. */
- (void)testLogSourceRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  [configFlags resetCache];
  NSString *configKey = [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_log_source"];
  [userDefaults setObject:@(100) forKey:configKey];
#if defined(FPR_AUTOPUSH_ENDPOINT)
  XCTAssertEqual([configurations logSource], 461);
#else
  XCTAssertEqual([configurations logSource], 100);
#endif

  [userDefaults setObject:@(200) forKey:configKey];
#if defined(FPR_AUTOPUSH_ENDPOINT)
  XCTAssertEqual([configurations logSource], 461);
#else
  XCTAssertEqual([configurations logSource], 200);
#endif

  [configFlags resetCache];
}

/** Validates if a resolve of disabled SDK version works. */
- (void)testDisabledSDKVersionsConfigResolveSuccessful {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  remoteConfig.lastFetchStatus = FIRRemoteConfigFetchStatusSuccess;
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSSet<NSString *> *versionSet =
      [[NSSet<NSString *> alloc] initWithObjects:@"1.0.2", @"1.0.3", nil];
  NSSet<NSString *> *emptySet = [[NSSet<NSString *> alloc] init];

  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_disabled_ios_versions"];
  [userDefaults setObject:@"1.0.2;1.0.3" forKey:configKey];

  XCTAssertEqualObjects([configurations sdkDisabledVersions], versionSet);
  [userDefaults setObject:@"" forKey:configKey];
  XCTAssertEqualObjects([configurations sdkDisabledVersions], emptySet);

  [configFlags resetCache];
}

/** Validates if SDK version based disabling is honored. */
- (void)testDisabledSDKVersionsDisablesSDK {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  remoteConfig.lastFetchStatus = FIRRemoteConfigFetchStatusSuccess;
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey = [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_enabled"];
  [userDefaults setObject:@(TRUE) forKey:configKey];

  XCTAssertEqual([configurations sdkEnabled], TRUE);

  NSString *disableVersionsConfigKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_disabled_ios_versions"];
  [userDefaults setObject:[NSString stringWithUTF8String:kFPRSDKVersion]
                   forKey:disableVersionsConfigKey];

  XCTAssertEqual([configurations sdkEnabled], FALSE);

  [configFlags resetCache];
}

/** Validates if Firebase Remote Config overrides work for SDK enabled. */
- (void)testSDKEnabledFlag {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  remoteConfig.lastFetchStatus = FIRRemoteConfigFetchStatusSuccess;
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey = [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_enabled"];
  [userDefaults setObject:@(TRUE) forKey:configKey];

  XCTAssertEqual([configurations sdkEnabled], TRUE);

  [userDefaults setObject:@(FALSE) forKey:configKey];
  XCTAssertEqual([configurations sdkEnabled], FALSE);

  [configFlags resetCache];
}

/** Validates if Plist overrides work for SDK Enabled flag. */
- (void)testPlistOverridesSDKEnabledFlag {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  remoteConfig.lastFetchStatus = FIRRemoteConfigFetchStatusSuccess;
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey = [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_enabled"];
  [userDefaults setObject:@(FALSE) forKey:configKey];
  XCTAssertEqual([configurations sdkEnabled], FALSE);

  NSDictionary<NSString *, id> *infoDictionary = configurations.infoDictionary;
  configurations.infoDictionary = @{@"firebase_performance_sdk_enabled" : @(TRUE)};
  XCTAssertEqual([configurations sdkEnabled], TRUE);
  configurations.infoDictionary = infoDictionary;

  [configFlags resetCache];
}

/** Validates if remote config overrides work for foreground rate limiting for traces. */
- (void)testForegroundRateLimitingTraceCountRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_rl_trace_event_count_fg"];
  [userDefaults setObject:@(100) forKey:configKey];
  XCTAssertEqual([configurations foregroundEventCount], 100);

  [userDefaults setObject:@(200) forKey:configKey];
  XCTAssertEqual([configurations foregroundEventCount], 200);
  [configFlags resetCache];
}

/** Validates if remote config overrides work for background rate limiting for traces. */
- (void)testBackgroundRateLimitingTraceCountRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_rl_trace_event_count_bg"];
  [userDefaults setObject:@(100) forKey:configKey];
  XCTAssertEqual([configurations backgroundEventCount], 100);

  [userDefaults setObject:@(200) forKey:configKey];
  XCTAssertEqual([configurations backgroundEventCount], 200);
  [configFlags resetCache];
}

/** Validates if remote config overrides work for foreground rate limiting for network requests. */
- (void)testForegroundRateLimitingNetworkCountRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey = [NSString
      stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_rl_network_request_event_count_fg"];
  [userDefaults setObject:@(100) forKey:configKey];
  XCTAssertEqual([configurations foregroundNetworkEventCount], 100);

  [userDefaults setObject:@(200) forKey:configKey];
  XCTAssertEqual([configurations foregroundNetworkEventCount], 200);
  [configFlags resetCache];
}

/** Validates if remote config overrides work for background rate limiting for network requests. */
- (void)testBackgroundRateLimitingNetworkCountRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey = [NSString
      stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_rl_network_request_event_count_bg"];
  [userDefaults setObject:@(100) forKey:configKey];
  XCTAssertEqual([configurations backgroundNetworkEventCount], 100);

  [userDefaults setObject:@(200) forKey:configKey];
  XCTAssertEqual([configurations backgroundNetworkEventCount], 200);
  [configFlags resetCache];
}

/** Validates if remote config overrides work for rate limiting time duration. */
- (void)testRateLimitingDurationRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_rl_time_limit_sec"];
  [userDefaults setObject:@(300) forKey:configKey];
  XCTAssertEqual([configurations foregroundEventTimeLimit], 5);
  XCTAssertEqual([configurations backgroundEventTimeLimit], 5);
  XCTAssertEqual([configurations foregroundNetworkEventTimeLimit], 5);
  XCTAssertEqual([configurations backgroundNetworkEventTimeLimit], 5);

  [userDefaults setObject:@(900) forKey:configKey];
  XCTAssertEqual([configurations foregroundEventTimeLimit], 15);
  XCTAssertEqual([configurations backgroundEventTimeLimit], 15);
  XCTAssertEqual([configurations foregroundNetworkEventTimeLimit], 15);
  XCTAssertEqual([configurations backgroundNetworkEventTimeLimit], 15);
  [configFlags resetCache];
}

/** Validates if remote config overrides work for gauge collecction frequency. */
- (void)testGaugeCollectionFrequencyRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKeyCPUFg =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix,
                                 @"fpr_session_gauge_cpu_capture_frequency_fg_ms"];
  NSString *configKeyCPUBg =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix,
                                 @"fpr_session_gauge_cpu_capture_frequency_bg_ms"];
  NSString *configKeyMemoryFg =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix,
                                 @"fpr_session_gauge_memory_capture_frequency_fg_ms"];
  NSString *configKeyMemoryBg =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix,
                                 @"fpr_session_gauge_memory_capture_frequency_bg_ms"];
  [userDefaults setObject:@(100) forKey:configKeyCPUFg];
  [userDefaults setObject:@(200) forKey:configKeyCPUBg];
  [userDefaults setObject:@(300) forKey:configKeyMemoryFg];
  [userDefaults setObject:@(400) forKey:configKeyMemoryBg];

  XCTAssertEqual([configurations cpuSamplingFrequencyInForegroundInMS], 100);
  XCTAssertEqual([configurations cpuSamplingFrequencyInBackgroundInMS], 200);
  XCTAssertEqual([configurations memorySamplingFrequencyInForegroundInMS], 300);
  XCTAssertEqual([configurations memorySamplingFrequencyInBackgroundInMS], 400);

  [userDefaults setObject:@(10) forKey:configKeyCPUFg];
  [userDefaults setObject:@(20) forKey:configKeyCPUBg];
  [userDefaults setObject:@(30) forKey:configKeyMemoryFg];
  [userDefaults setObject:@(40) forKey:configKeyMemoryBg];

  XCTAssertEqual([configurations cpuSamplingFrequencyInForegroundInMS], 10);
  XCTAssertEqual([configurations cpuSamplingFrequencyInBackgroundInMS], 20);
  XCTAssertEqual([configurations memorySamplingFrequencyInForegroundInMS], 30);
  XCTAssertEqual([configurations memorySamplingFrequencyInBackgroundInMS], 40);

  [configFlags resetCache];
}

/** Validates if remote config overrides work for sessions max length duration. */
- (void)testSessionMaxLengthDurationRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_session_max_duration_min"];
  [userDefaults setObject:@(100) forKey:configKey];
  XCTAssertEqual([configurations maxSessionLengthInMinutes], 100);

  [userDefaults setObject:@(200) forKey:configKey];
  XCTAssertEqual([configurations maxSessionLengthInMinutes], 200);
  [configFlags resetCache];
}

- (void)testPrewarmDetectionRemoteConfigOverrides {
  FPRConfigurations *configurations =
      [[FPRConfigurations alloc] initWithSources:FPRConfigurationSourceRemoteConfig];

  FPRFakeRemoteConfig *remoteConfig = [[FPRFakeRemoteConfig alloc] init];
  FPRRemoteConfigFlags *configFlags =
      [[FPRRemoteConfigFlags alloc] initWithRemoteConfig:(FIRRemoteConfig *)remoteConfig];
  configurations.remoteConfigFlags = configFlags;
  configFlags.lastFetchedTime = [NSDate date];

  GULUserDefaults *_Nonnull userDefaults = [self makeEmptyUserDefaults];
  configFlags.userDefaults = userDefaults;

  NSString *configKey =
      [NSString stringWithFormat:@"%@.%@", kFPRConfigPrefix, @"fpr_prewarm_detection"];
  [userDefaults setObject:@(0) forKey:configKey];
  XCTAssertEqual([configurations prewarmDetectionMode], 0);

  [userDefaults setObject:@(1) forKey:configKey];
  XCTAssertEqual([configurations prewarmDetectionMode], 1);

  [userDefaults setObject:@(2) forKey:configKey];
  XCTAssertEqual([configurations prewarmDetectionMode], 2);
  [configFlags resetCache];
}

@end