feat: Adds more tests for cli-client.

Tests/CliClientTests/CliClientTests.swift

@@ -1,6 +1,7 @@
-import CliClient
+@_spi(Internal) import CliClient
 import ConfigurationClient
 import Dependencies
+import FileClient
 import Foundation
 import ShellClient
 import Testing
@@ -91,6 +92,70 @@ struct CliClientTests: TestCase {
     }
   }
 
+  @Test
+  func ensuredPlaybookDirectory() throws {
+    let configuration = Configuration.mock
+    let playbookDir = try configuration.ensuredPlaybookDirectory("playbook")
+    #expect(playbookDir == "playbook")
+
+    do {
+      _ = try configuration.ensuredPlaybookDirectory(nil)
+      #expect(Bool(false))
+    } catch {
+      #expect(Bool(true))
+    }
+  }
+
+  @Test
+  func shellOrDefault() {
+    var shell: String? = "/bin/bash"
+    #expect(shell.orDefault == .custom(path: "/bin/bash", useDashC: true))
+
+    shell = nil
+    #expect(shell.orDefault == .zsh(useDashC: true))
+  }
+
+  @Test
+  func testEnsuredInventoryPath() {
+    let configuration = Configuration(playbook: .init(inventory: "inventory.ini"))
+    let playbookDir = "playbook"
+    let inventoryPath = "inventory.ini"
+
+    var output = ensuredInventoryPath(
+      inventoryPath,
+      configuration: configuration,
+      playbookDirectory: playbookDir
+    )
+
+    #expect(output == "inventory.ini")
+
+    output = ensuredInventoryPath(
+      nil,
+      configuration: configuration,
+      playbookDirectory: playbookDir
+    )
+    #expect(output == "inventory.ini")
+  }
+
+  @Test
+  func vaultFilePath() async throws {
+    var fileClient = FileClient.testValue
+    fileClient.findVaultFileInCurrentDirectory = { URL(string: "vault.yml") }
+
+    var output = try await fileClient.ensuredVaultFilePath("vault.yml")
+    #expect(output == "vault.yml")
+
+    output = try await fileClient.ensuredVaultFilePath(nil)
+
+    fileClient.findVaultFileInCurrentDirectory = { nil }
+    do {
+      _ = try await fileClient.ensuredVaultFilePath(nil)
+      #expect(Bool(false))
+    } catch {
+      #expect(Bool(true))
+    }
+  }
+
   func withMockConfiguration(
     _ capturing: CliClient.CapturingClient,
     configuration: Configuration = .mock,