diff --git a/.github/workflows/build-app.yml b/.github/workflows/build-app.yml
index f21d62a..a30856f 100644
--- a/.github/workflows/build-app.yml
+++ b/.github/workflows/build-app.yml
@@ -28,5 +28,8 @@ jobs:
       - name: Install XCBeautify
         run: brew install xcbeautify
 
+      - name: Test
+        run: set -o pipefail && xcodebuild -scheme MiniSim -destination 'platform=macOS' -skipPackagePluginValidation test COMPILER_INDEX_STORE_ENABLE=NO | xcbeautify
+
       - name: Build
-        run: set -o pipefail && xcodebuild -scheme MiniSim -destination 'platform=macOS' -skipPackagePluginValidation build | xcbeautify
+        run: set -o pipefail && xcodebuild -scheme MiniSim -destination 'platform=macOS' -skipPackagePluginValidation build COMPILER_INDEX_STORE_ENABLE=NO | xcbeautify
diff --git a/MiniSim.xcodeproj/project.pbxproj b/MiniSim.xcodeproj/project.pbxproj
index 3e4913a..db5ed8b 100644
--- a/MiniSim.xcodeproj/project.pbxproj
+++ b/MiniSim.xcodeproj/project.pbxproj
@@ -69,6 +69,7 @@
 		768F8EC829954C8A00DFBCDB /* Sparkle in Frameworks */ = {isa = PBXBuildFile; productRef = 768F8EC729954C8A00DFBCDB /* Sparkle */; };
 		76AC9AF62A0EA82C00864A8B /* CustomCommands.swift in Sources */ = {isa = PBXBuildFile; fileRef = 76AC9AF52A0EA82C00864A8B /* CustomCommands.swift */; };
 		76AC9AF92A0EB50800864A8B /* SymbolPicker in Frameworks */ = {isa = PBXBuildFile; productRef = 76AC9AF82A0EB50800864A8B /* SymbolPicker */; };
+		76B70F7E2B0D361A009D87A4 /* UserDefaultsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 76B70F7D2B0D361A009D87A4 /* UserDefaultsTests.swift */; };
 		76E4451229D4391000039025 /* Onboarding.swift in Sources */ = {isa = PBXBuildFile; fileRef = 76E4451129D4391000039025 /* Onboarding.swift */; };
 		76E4451429D4403F00039025 /* NSNotificationName.swift in Sources */ = {isa = PBXBuildFile; fileRef = 76E4451329D4403F00039025 /* NSNotificationName.swift */; };
 		76F04A11298A5AE000BF9CA3 /* ADB.swift in Sources */ = {isa = PBXBuildFile; fileRef = 76F04A10298A5AE000BF9CA3 /* ADB.swift */; };
@@ -82,6 +83,16 @@
 		76FCABAB29B390D5003BBF9A /* Collection+get.swift in Sources */ = {isa = PBXBuildFile; fileRef = 76FCABAA29B390D5003BBF9A /* Collection+get.swift */; };
 /* End PBXBuildFile section */
 
+/* Begin PBXContainerItemProxy section */
+		76B70F782B0D359D009D87A4 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 766BD2282981628A0042261B /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 766BD22F2981628A0042261B;
+			remoteInfo = MiniSim;
+		};
+/* End PBXContainerItemProxy section */
+
 /* Begin PBXFileReference section */
 		4AFACC732AD730BE00EC369F /* SubMenuItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SubMenuItem.swift; sourceTree = "<group>"; };
 		4AFACC752AD73D7900EC369F /* NSMenuItem+ConvenienceInit.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "NSMenuItem+ConvenienceInit.swift"; sourceTree = "<group>"; };
@@ -142,6 +153,8 @@
 		7684FAAE29D202F500230BB0 /* AndroidHomeError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AndroidHomeError.swift; sourceTree = "<group>"; };
 		768F8ECC2995575B00DFBCDB /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist; path = Info.plist; sourceTree = "<group>"; };
 		76AC9AF52A0EA82C00864A8B /* CustomCommands.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CustomCommands.swift; sourceTree = "<group>"; };
+		76B70F742B0D359D009D87A4 /* MiniSimTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = MiniSimTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+		76B70F7D2B0D361A009D87A4 /* UserDefaultsTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserDefaultsTests.swift; sourceTree = "<group>"; };
 		76E4451129D4391000039025 /* Onboarding.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Onboarding.swift; sourceTree = "<group>"; };
 		76E4451329D4403F00039025 /* NSNotificationName.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NSNotificationName.swift; sourceTree = "<group>"; };
 		76F04A10298A5AE000BF9CA3 /* ADB.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ADB.swift; sourceTree = "<group>"; };
@@ -169,6 +182,13 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		76B70F712B0D359D009D87A4 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
@@ -266,6 +286,7 @@
 			isa = PBXGroup;
 			children = (
 				766BD2322981628A0042261B /* MiniSim */,
+				76B70F752B0D359D009D87A4 /* MiniSimTests */,
 				766BD2312981628A0042261B /* Products */,
 			);
 			sourceTree = "<group>";
@@ -274,6 +295,7 @@
 			isa = PBXGroup;
 			children = (
 				766BD2302981628A0042261B /* MiniSim.app */,
+				76B70F742B0D359D009D87A4 /* MiniSimTests.xctest */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -330,6 +352,14 @@
 			path = Onboarding;
 			sourceTree = "<group>";
 		};
+		76B70F752B0D359D009D87A4 /* MiniSimTests */ = {
+			isa = PBXGroup;
+			children = (
+				76B70F7D2B0D361A009D87A4 /* UserDefaultsTests.swift */,
+			);
+			path = MiniSimTests;
+			sourceTree = "<group>";
+		};
 		76E5FAD1299BEBD2007987E0 /* MenuItems */ = {
 			isa = PBXGroup;
 			children = (
@@ -390,6 +420,25 @@
 			productReference = 766BD2302981628A0042261B /* MiniSim.app */;
 			productType = "com.apple.product-type.application";
 		};
+		76B70F732B0D359D009D87A4 /* MiniSimTests */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 76B70F7C2B0D359E009D87A4 /* Build configuration list for PBXNativeTarget "MiniSimTests" */;
+			buildPhases = (
+				76B70F702B0D359D009D87A4 /* Sources */,
+				76B70F712B0D359D009D87A4 /* Frameworks */,
+				76B70F722B0D359D009D87A4 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				76B70F802B0D4F9D009D87A4 /* PBXTargetDependency */,
+				76B70F792B0D359D009D87A4 /* PBXTargetDependency */,
+			);
+			name = MiniSimTests;
+			productName = MiniSimTests;
+			productReference = 76B70F742B0D359D009D87A4 /* MiniSimTests.xctest */;
+			productType = "com.apple.product-type.bundle.unit-test";
+		};
 /* End PBXNativeTarget section */
 
 /* Begin PBXProject section */
@@ -397,12 +446,16 @@
 			isa = PBXProject;
 			attributes = {
 				BuildIndependentTargetsInParallel = 1;
-				LastSwiftUpdateCheck = 1400;
-				LastUpgradeCheck = 1420;
+				LastSwiftUpdateCheck = 1500;
+				LastUpgradeCheck = 1500;
 				TargetAttributes = {
 					766BD22F2981628A0042261B = {
 						CreatedOnToolsVersion = 14.0.1;
 					};
+					76B70F732B0D359D009D87A4 = {
+						CreatedOnToolsVersion = 15.0.1;
+						TestTargetID = 766BD22F2981628A0042261B;
+					};
 				};
 			};
 			buildConfigurationList = 766BD22B2981628A0042261B /* Build configuration list for PBXProject "MiniSim" */;
@@ -429,6 +482,7 @@
 			projectRoot = "";
 			targets = (
 				766BD22F2981628A0042261B /* MiniSim */,
+				76B70F732B0D359D009D87A4 /* MiniSimTests */,
 			);
 		};
 /* End PBXProject section */
@@ -445,6 +499,13 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		76B70F722B0D359D009D87A4 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXShellScriptBuildPhase section */
@@ -539,6 +600,14 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		76B70F702B0D359D009D87A4 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				76B70F7E2B0D361A009D87A4 /* UserDefaultsTests.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXSourcesBuildPhase section */
 
 /* Begin PBXTargetDependency section */
@@ -546,6 +615,15 @@
 			isa = PBXTargetDependency;
 			productRef = 4A7892892AF1A9A3004D3FC8 /* SwiftLintPlugin */;
 		};
+		76B70F792B0D359D009D87A4 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 766BD22F2981628A0042261B /* MiniSim */;
+			targetProxy = 76B70F782B0D359D009D87A4 /* PBXContainerItemProxy */;
+		};
+		76B70F802B0D4F9D009D87A4 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			productRef = 76B70F7F2B0D4F9D009D87A4 /* SwiftLintPlugin */;
+		};
 /* End PBXTargetDependency section */
 
 /* Begin XCBuildConfiguration section */
@@ -553,6 +631,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
@@ -615,6 +694,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
@@ -739,6 +819,53 @@
 			};
 			name = Release;
 		};
+		76B70F7A2B0D359E009D87A4 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = "";
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 13.0;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = pl.okwasniewski.MiniSimTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG $(inherited)";
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				SWIFT_VERSION = 5.0;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/MiniSim.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/MiniSim";
+			};
+			name = Debug;
+		};
+		76B70F7B2B0D359E009D87A4 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = "";
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 13.0;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = pl.okwasniewski.MiniSimTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				SWIFT_VERSION = 5.0;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/MiniSim.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/MiniSim";
+			};
+			name = Release;
+		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
@@ -760,6 +887,15 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		76B70F7C2B0D359E009D87A4 /* Build configuration list for PBXNativeTarget "MiniSimTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				76B70F7A2B0D359E009D87A4 /* Debug */,
+				76B70F7B2B0D359E009D87A4 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 
 /* Begin XCRemoteSwiftPackageReference section */
@@ -865,6 +1001,11 @@
 			package = 76AC9AF72A0EB50800864A8B /* XCRemoteSwiftPackageReference "SymbolPicker" */;
 			productName = SymbolPicker;
 		};
+		76B70F7F2B0D4F9D009D87A4 /* SwiftLintPlugin */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = 4A7892862AF1A767004D3FC8 /* XCRemoteSwiftPackageReference "SwiftLint" */;
+			productName = "plugin:SwiftLintPlugin";
+		};
 		76F04A13298A62CF00BF9CA3 /* ShellOut */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = 76F04A12298A62CF00BF9CA3 /* XCRemoteSwiftPackageReference "ShellOut" */;
diff --git a/MiniSim.xcodeproj/xcshareddata/xcschemes/MiniSim.xcscheme b/MiniSim.xcodeproj/xcshareddata/xcschemes/MiniSim.xcscheme
index a1cdeee..3ae36fe 100644
--- a/MiniSim.xcodeproj/xcshareddata/xcschemes/MiniSim.xcscheme
+++ b/MiniSim.xcodeproj/xcshareddata/xcschemes/MiniSim.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1420"
+   LastUpgradeVersion = "1500"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -28,6 +28,17 @@
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "76B70F732B0D359D009D87A4"
+               BuildableName = "MiniSimTests.xctest"
+               BlueprintName = "MiniSimTests"
+               ReferencedContainer = "container:MiniSim.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
       </Testables>
    </TestAction>
    <LaunchAction
diff --git a/MiniSimTests/UserDefaultsTests.swift b/MiniSimTests/UserDefaultsTests.swift
new file mode 100644
index 0000000..33a4fcc
--- /dev/null
+++ b/MiniSimTests/UserDefaultsTests.swift
@@ -0,0 +1,62 @@
+import XCTest
+
+@testable import MiniSim
+
+final class UserDefaultsTests: XCTestCase {
+    let savedParameters = UserDefaults.standard.parameters
+    let savedCommands = UserDefaults.standard.commands
+    let savedAndroidHome = UserDefaults.standard.androidHome
+    let savedIsOnboardingFinished = UserDefaults.standard.isOnboardingFinished
+    let savedEnableiOSSimulators = UserDefaults.standard.enableiOSSimulators
+    let savedEnableAndroidEmulators = UserDefaults.standard.enableAndroidEmulators
+
+    override func setUp() {
+        UserDefaults.standard.removeObject(forKey: UserDefaults.Keys.parameters)
+        UserDefaults.standard.removeObject(forKey: UserDefaults.Keys.commands)
+        UserDefaults.standard.removeObject(forKey: UserDefaults.Keys.androidHome)
+        UserDefaults.standard.removeObject(forKey: UserDefaults.Keys.isOnboardingFinished)
+        UserDefaults.standard.removeObject(forKey: UserDefaults.Keys.enableiOSSimulators)
+        UserDefaults.standard.removeObject(forKey: UserDefaults.Keys.enableAndroidEmulators)
+    }
+
+    override func tearDown() {
+        UserDefaults.standard.parameters = savedParameters
+        UserDefaults.standard.commands = savedCommands
+        UserDefaults.standard.androidHome = savedAndroidHome
+        UserDefaults.standard.isOnboardingFinished = savedIsOnboardingFinished
+        UserDefaults.standard.enableiOSSimulators = savedEnableiOSSimulators
+        UserDefaults.standard.enableAndroidEmulators = savedEnableAndroidEmulators
+    }
+
+    func testDefaultValues() {
+        XCTAssertEqual(UserDefaults.standard.parameters, nil)
+        XCTAssertEqual(UserDefaults.standard.commands, nil)
+        XCTAssertEqual(UserDefaults.standard.androidHome, nil)
+        XCTAssertEqual(UserDefaults.standard.isOnboardingFinished, false)
+        XCTAssertEqual(UserDefaults.standard.enableiOSSimulators, true)
+        XCTAssertEqual(UserDefaults.standard.enableAndroidEmulators, true)
+    }
+
+    func testChangingParameters() {
+        let parameters: [Parameter] = [.init(title: "First", command: "adb reverse")]
+        let data = try? JSONEncoder().encode(parameters)
+        UserDefaults.standard.parameters = data
+
+        let newParameters = UserDefaults.standard.parameters
+        let decoded = try? JSONDecoder().decode([Parameter].self, from: newParameters!)
+
+        XCTAssertEqual(parameters, decoded)
+    }
+
+    func testChanging() {
+        UserDefaults.standard.isOnboardingFinished = true
+        UserDefaults.standard.enableiOSSimulators = false
+        UserDefaults.standard.enableAndroidEmulators = false
+        UserDefaults.standard.androidHome = "test"
+
+        XCTAssertEqual(UserDefaults.standard.isOnboardingFinished, true)
+        XCTAssertEqual(UserDefaults.standard.enableiOSSimulators, false)
+        XCTAssertEqual(UserDefaults.standard.enableAndroidEmulators, false)
+        XCTAssertEqual(UserDefaults.standard.androidHome, "test")
+    }
+}