chore: import upstream snapshot with attribution

Tests/ContainerizationTests/KernelTests.swift

@@ -0,0 +1,93 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
+//
+// 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
+//
+//   https://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 Foundation
+import Logging
+import Testing
+
+@testable import Containerization
+
+final class KernelTests {
+    @Test func kernelArgs() {
+        let commandLine = Kernel.CommandLine(debug: false, panic: 0)
+        let kernel = Kernel(path: .init(fileURLWithPath: ""), platform: .linuxArm, commandline: commandLine)
+
+        let expected = "console=hvc0 tsc=reliable panic=0"
+        let cmdline = kernel.commandLine.kernelArgs.joined(separator: " ")
+        #expect(cmdline == expected)
+    }
+
+    @Test func kernelDebugArgs() {
+        let cmdLine = Kernel.CommandLine(debug: true, panic: 0)
+        let kernel = Kernel(path: .init(fileURLWithPath: ""), platform: .linuxArm, commandline: cmdLine)
+
+        let expected = "console=hvc0 tsc=reliable debug panic=0"
+        let cmdline = kernel.commandLine.kernelArgs.joined(separator: " ")
+        #expect(cmdline == expected)
+    }
+
+    @Test func kernelCommandLineInitWithDebugTrue() {
+        let commandLine = Kernel.CommandLine(debug: true, panic: 5, initArgs: ["--verbose"])
+
+        #expect(commandLine.kernelArgs == ["console=hvc0", "tsc=reliable", "debug", "panic=5"])
+        #expect(commandLine.initArgs == ["--verbose"])
+    }
+
+    @Test func kernelCommandLineMutatingMethods() {
+        var commandLine = Kernel.CommandLine(kernelArgs: ["console=hvc0"], initArgs: [])
+
+        commandLine.addDebug()
+        commandLine.addPanic(level: 10)
+
+        #expect(commandLine.kernelArgs == ["console=hvc0", "debug", "panic=10"])
+    }
+
+    @Test func setAgentLogLevelAppendsFlagAndValue() {
+        var commandLine = Kernel.CommandLine(initArgs: [])
+        commandLine.setAgentLogLevel(level: .debug)
+        #expect(commandLine.initArgs == ["--log-level", "debug"])
+    }
+
+    @Test(arguments: [
+        (Logger.Level.trace, "trace"),
+        (.debug, "debug"),
+        (.info, "info"),
+        (.notice, "notice"),
+        (.warning, "warning"),
+        (.error, "error"),
+        (.critical, "critical"),
+    ])
+    func setAgentLogLevelForEachLevel(level: Logger.Level, expected: String) {
+        var commandLine = Kernel.CommandLine(initArgs: [])
+        commandLine.setAgentLogLevel(level: level)
+        #expect(commandLine.initArgs == ["--log-level", expected])
+    }
+
+    @Test func setAgentLogLevelPreservesExistingInitArgs() {
+        var commandLine = Kernel.CommandLine(initArgs: ["--verbose"])
+        commandLine.setAgentLogLevel(level: .info)
+        #expect(commandLine.initArgs == ["--verbose", "--log-level", "info"])
+    }
+
+    @Test func setAgentLogLevelDoesNotAffectKernelArgs() {
+        var commandLine = Kernel.CommandLine(debug: true, panic: 0, initArgs: [])
+        let kernelArgsBefore = commandLine.kernelArgs
+        commandLine.setAgentLogLevel(level: .warning)
+        #expect(commandLine.kernelArgs == kernelArgsBefore)
+    }
+}