Initial release

Tests/KnotchyCoreTests/ContainerCLIBackendRuntimeTests.swift

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+import Foundation
+import Testing
+@testable import KnotchyCore
+
+struct ContainerCLIBackendRuntimeTests {
+    /// A fake `container` that answers only `--version`.
+    private func fakeCLI(printing line: String) throws -> (CLIRunner, URL) {
+        let directory = FileManager.default.temporaryDirectory.appendingPathComponent("cli-\(UUID().uuidString)")
+        try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true)
+        let tool = directory.appendingPathComponent("container")
+        let script = "#!/bin/sh\nif [ \"$1\" = --version ]; then echo '\(line)'; exit 0; fi\nexit 1\n"
+        try script.write(to: tool, atomically: true, encoding: .utf8)
+        try FileManager.default.setAttributes([.posixPermissions: 0o755], ofItemAtPath: tool.path)
+        return (CLIRunner(searchPaths: [tool.path]), directory)
+    }
+
+    @Test func anOldRuntimeIsFlaggedBeforeAnythingElse() async throws {
+        let (cli, directory) = try fakeCLI(printing: "container CLI version 1.3.0 (build: release)")
+        defer { try? FileManager.default.removeItem(at: directory) }
+        let backend = ContainerCLIBackend(vmSources: nil, cli: cli)
+        #expect(await backend.runtimeStatus() == .outdated("1.3.0"))
+        #expect(await backend.preflight() == .issue(.cliOutdated(found: "1.3.0")))
+    }
+
+    @Test func aMissingRuntimeIsReported() async {
+        let backend = ContainerCLIBackend(vmSources: nil, cli: CLIRunner(searchPaths: ["/nonexistent/container"]))
+        #expect(await backend.runtimeStatus() == .missing)
+        #expect(await backend.preflight() == .issue(.cliMissing))
+    }
+
+    @Test func anOldRuntimeHasNoAutomaticFix() async throws {
+        let backend = ContainerCLIBackend(vmSources: nil, cli: CLIRunner(searchPaths: []))
+        await #expect(throws: VMBackendError.self) {
+            try await backend.fix(.cliOutdated(found: "1.3.0")) { _ in }
+        }
+    }
+}