Adding Back Unit Tests (#10)

.devcontainer/devcontainer.json

@@ -0,0 +1,39 @@
+{
+    "name": "Swift",
+    "image": "swift:6.0",
+    "features": {
+        "ghcr.io/devcontainers/features/common-utils:2": {
+            "installZsh": "false",
+            "username": "vscode",
+            "upgradePackages": "false"
+        },
+        "ghcr.io/devcontainers/features/git:1": {
+            "version": "os-provided",
+            "ppa": "false"
+        }
+    },
+    "runArgs": [
+        "--cap-add=SYS_PTRACE",
+        "--security-opt",
+        "seccomp=unconfined"
+    ],
+    // Configure tool-specific properties.
+    "customizations": {
+        // Configure properties specific to VS Code.
+        "vscode": {
+            // Set *default* container specific settings.json values on container create.
+            "settings": {
+                "lldb.library": "/usr/lib/liblldb.so"
+            },
+            // Add the IDs of extensions you want installed when the container is created.
+            "extensions": [
+                "sswg.swift-lang"
+            ]
+        }
+    },
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+
+    // Set `remoteUser` to `root` to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+    "remoteUser": "vscode"
+}

.devcontainer/swift-5.9/devcontainer.json

@@ -0,0 +1,39 @@
+{
+    "name": "Swift",
+    "image": "swift:5.9",
+    "features": {
+        "ghcr.io/devcontainers/features/common-utils:2": {
+            "installZsh": "false",
+            "username": "vscode",
+            "upgradePackages": "false"
+        },
+        "ghcr.io/devcontainers/features/git:1": {
+            "version": "os-provided",
+            "ppa": "false"
+        }
+    },
+    "runArgs": [
+        "--cap-add=SYS_PTRACE",
+        "--security-opt",
+        "seccomp=unconfined"
+    ],
+    // Configure tool-specific properties.
+    "customizations": {
+        // Configure properties specific to VS Code.
+        "vscode": {
+            // Set *default* container specific settings.json values on container create.
+            "settings": {
+                "lldb.library": "/usr/lib/liblldb.so"
+            },
+            // Add the IDs of extensions you want installed when the container is created.
+            "extensions": [
+                "sswg.swift-lang"
+            ]
+        }
+    },
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+
+    // Set `remoteUser` to `root` to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+    "remoteUser": "root"
+}

.devcontainer/swift-6.0/devcontainer.json

@@ -0,0 +1,39 @@
+{
+    "name": "Swift",
+    "image": "swift:6.0",
+    "features": {
+        "ghcr.io/devcontainers/features/common-utils:2": {
+            "installZsh": "false",
+            "username": "vscode",
+            "upgradePackages": "false"
+        },
+        "ghcr.io/devcontainers/features/git:1": {
+            "version": "os-provided",
+            "ppa": "false"
+        }
+    },
+    "runArgs": [
+        "--cap-add=SYS_PTRACE",
+        "--security-opt",
+        "seccomp=unconfined"
+    ],
+    // Configure tool-specific properties.
+    "customizations": {
+        // Configure properties specific to VS Code.
+        "vscode": {
+            // Set *default* container specific settings.json values on container create.
+            "settings": {
+                "lldb.library": "/usr/lib/liblldb.so"
+            },
+            // Add the IDs of extensions you want installed when the container is created.
+            "extensions": [
+                "sswg.swift-lang"
+            ]
+        }
+    },
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+
+    // Set `remoteUser` to `root` to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+    "remoteUser": "vscode"
+}

Tests/FeatherQuillTests/AudienceType.swift

@@ -0,0 +1,52 @@
+//
+//  AudienceType.swift
+//  FeatherQuill
+//
+//  Created by Leo Dion.
+//  Copyright © 2025 BrightDigit.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the “Software”), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+import FeatherQuill
+
+public struct AudienceType: UserType {
+  public typealias RawValue = Int
+  public static let proSubscriber: AudienceType = .init(rawValue: 1)
+  public static let testFlightBeta: AudienceType = .init(rawValue: 2)
+  public static let any: AudienceType = .init(rawValue: .max)
+  public static let `default`: AudienceType = [.testFlightBeta, proSubscriber]
+  public static let none: AudienceType = []
+  public var rawValue: Int
+
+  public init(rawValue: Int) {
+    self.rawValue = rawValue
+  }
+
+  public static func includes(_ value: AudienceType) -> Bool {
+    guard value.rawValue > 0 else {
+      return false
+    }
+    let value: Bool = .random()
+    return value
+  }
+}

Tests/FeatherQuillTests/FeatureAvailabilityMetricsTests.swift

@@ -27,21 +27,19 @@
 //  OTHER DEALINGS IN THE SOFTWARE.
 //
 
-import FeatherQuill
+@testable import FeatherQuill
 import XCTest
 
 internal final class FeatureAvailabilityMetricsTests: XCTestCase {
   internal func testUserDefaultsMetrics() {
-    XCTAssert(true)
+    let expected = FeatureAvailabilityMetrics(
+      userType: AudienceType.proSubscriber,
+      probability: .random(in: 0 ..< 1)
+    )
+    UserDefaults.wrappedStandard().set(expected, forKey: "testMetrics")
+    let actual: FeatureAvailabilityMetrics<AudienceType>? =
+      UserDefaults.wrappedStandard().metrics(forKey: "testMetrics")
 
-//    let expected = FeatureAvailabilityMetrics(
-//      userType: AudienceType.proSubscriber,
-//      probability: .random(in: 0 ..< 1)
-//    )
-//    UserDefaults.standard.set(expected, forKey: "testMetrics")
-//    let actual: FeatureAvailabilityMetrics<AudienceType>? =
-//      UserDefaults.standard.metrics(forKey: "testMetrics")
-//
-//    XCTAssertEqual(expected, actual)
+    XCTAssertEqual(expected, actual)
   }
 }

Tests/FeatherQuillTests/FeatureFlagTests.swift

@@ -0,0 +1,47 @@
+//
+//  FeatureFlagTests.swift
+//  FeatherQuill
+//
+//  Created by Leo Dion.
+//  Copyright © 2025 BrightDigit.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the “Software”), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+import XCTest
+
+internal final class FeatureFlagTests: XCTestCase {
+  internal func testFlag() throws {
+    #if canImport(SwiftUI)
+      // swiftlint:disable:next force_unwrapping
+      let domain = Bundle.main.bundleIdentifier!
+      UserDefaults.standard.removePersistentDomain(forName: domain)
+      XCTAssertEqual(MockFeatureFlag.key, "Mock")
+      let defaultMock = MockFeatureFlag.defaultValue
+      XCTAssertEqual(
+        defaultMock.value, MockFeatureFlag.initialValue
+      )
+    #else
+      throw XCTSkip("Not suported outside of SwiftUI.")
+    #endif
+  }
+}

Tests/FeatherQuillTests/FeatureTests.swift

@@ -0,0 +1,70 @@
+//
+//  FeatureTests.swift
+//  FeatherQuill
+//
+//  Created by Leo Dion.
+//  Copyright © 2025 BrightDigit.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the “Software”), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+@testable import FeatherQuill
+import XCTest
+
+internal final class FeatureTests: XCTestCase {
+  private static func fullKey(for featureKey: String) -> String {
+    [FeatureFlags.rootKey, featureKey, FeatureFlags.valueKey].joined(separator: ".")
+  }
+
+  #if canImport(SwiftUI)
+    private static func feature(key: String) -> Feature<Int, AudienceType> {
+      Feature(
+        key: key,
+        defaultValue: 0,
+        userType: AudienceType.default
+      ) { _ in true }
+    }
+
+    private static func setExpectedValue<ValueType>(
+      _ expectedValue: ValueType,
+      to feature: Feature<ValueType, some Any>
+    ) async {
+      await MainActor.run {
+        feature.bindingValue.wrappedValue = expectedValue
+      }
+    }
+  #endif
+
+  internal func testWrapped() async throws {
+    #if canImport(SwiftUI)
+      let key = UUID().uuidString
+      let expectedValue = Int.random(in: 100 ... 1_000)
+      let feature = Self.feature(key: key)
+      let fullKey = Self.fullKey(for: key)
+      await Self.setExpectedValue(expectedValue, to: feature)
+      let actualValue = UserDefaults.standard.integer(forKey: fullKey)
+      XCTAssertEqual(actualValue, expectedValue)
+    #else
+      throw XCTSkip("Not suported outside of SwiftUI.")
+    #endif
+  }
+}

Tests/FeatherQuillTests/MockFeatureFlag.swift

@@ -0,0 +1,44 @@
+//
+//  MockFeatureFlag.swift
+//  FeatherQuill
+//
+//  Created by Leo Dion.
+//  Copyright © 2025 BrightDigit.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the “Software”), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+#if canImport(SwiftUI)
+  import FeatherQuill
+
+  internal struct MockFeatureFlag: FeatureFlag {
+    internal typealias UserTypeValue = AudienceType
+
+    internal static let initialValue: Int = .random(in: 1_000 ... 9_999)
+
+    internal static let probability: Double = .random(in: 0 ..< 1)
+
+    internal static func evaluateUser(_: AudienceType) async -> Bool {
+      true
+    }
+  }
+#endif