Improve desktop script runs with timestamps & logs

Improve script execution in the desktop app by introducing timestamped
filenames and detailed logging. These changes aim to facilitate easier
debugging, auditing and overall better user experience.

Key changes:

- Add timestamps in filenames for temporary files to aid in
  troubleshooting and auditing.
- Add application logging throughout the script execution process to
  enhance troubleshooting capabilities.

Other supporting changes:

- Refactor `TemporaryFileCodeRunner` with subfunctions for improved
  readability, maintenance, reusability and extensibility.
- Refactor unit tests for `TemporaryFileCodeRunner` for improved
  granularity and simplicity.
- Create centralized definition of supported operating systems by
  privacy.sexy to ensure robust and consistent test case creation.
- Simplify the `runCode` method by removing the file extension
  parameter; now handled internally by `FileNameGenerator`.

src/application/CodeRunner.ts

@@ -2,6 +2,8 @@ import { OperatingSystem } from '@/domain/OperatingSystem';
 
 export interface CodeRunner {
   runCode(
-    code: string, folderName: string, fileExtension: string, os: OperatingSystem,
+    code: string,
+    tempScriptFolderName: string,
+    os: OperatingSystem,
   ): Promise<void>;
 }

src/infrastructure/CodeRunner/FileNameGenerator.ts

@@ -0,0 +1,35 @@
+import { OperatingSystem } from '@/domain/OperatingSystem';
+
+/**
+ * Generates a timestamped filename specific to the given operating system.
+ *
+ * The filename includes:
+ *  - A timestamp for uniqueness and easier auditability.
+ *  - File extension based on the operating system.
+ */
+export function generateOsTimestampedFileName(
+  currentOs: OperatingSystem,
+  date = new Date(),
+): string {
+  const baseFileName = `run-${createTimeStampForFile(date)}`;
+  const extension = FileExtensions[currentOs];
+  return extension ? `${baseFileName}.${extension}` : baseFileName;
+}
+
+const FileExtensions: Partial<Record<OperatingSystem, string>> = {
+  // '.bat' for Windows batch files; required for executability.
+  [OperatingSystem.Windows]: 'bat',
+
+  // '.sh' for Unix-like systems; enhances recognition as a shell script
+  [OperatingSystem.macOS]: 'sh',
+  [OperatingSystem.Linux]: 'sh',
+};
+
+/** Generates a timestamp for the filename in 'YYYY-MM-DD_HH-MM-SS' format. */
+function createTimeStampForFile(date: Date): string {
+  return date
+    .toISOString()
+    .replace(/T/, '_')
+    .replace(/:/g, '-')
+    .replace(/\..+/, '');
+}

src/infrastructure/CodeRunner/TemporaryFileCodeRunner.ts

@@ -1,37 +1,88 @@
 import { OperatingSystem } from '@/domain/OperatingSystem';
 import { CodeRunner } from '@/application/CodeRunner';
+import { Logger } from '@/application/Common/Log/Logger';
+import { ElectronLogger } from '../Log/ElectronLogger';
 import { SystemOperations } from './SystemOperations/SystemOperations';
 import { createNodeSystemOperations } from './SystemOperations/NodeSystemOperations';
+import { generateOsTimestampedFileName } from './FileNameGenerator';
+
+export type FileNameGenerator = (os: OperatingSystem) => string;
 
 export class TemporaryFileCodeRunner implements CodeRunner {
   constructor(
     private readonly system: SystemOperations = createNodeSystemOperations(),
+    private readonly fileNameGenerator: FileNameGenerator = generateOsTimestampedFileName,
+    private readonly logger: Logger = ElectronLogger,
   ) { }
 
   public async runCode(
     code: string,
-    folderName: string,
-    fileExtension: string,
+    tempScriptFolderName: string,
     os: OperatingSystem,
   ): Promise<void> {
-    const dir = this.system.location.combinePaths(
+    this.logger.info(`Starting running code for OS: ${OperatingSystem[os]}`);
+    try {
+      const fileName = this.fileNameGenerator(os);
+      const filePath = await this.createTemporaryFile(fileName, tempScriptFolderName, code);
+      await this.executeFile(filePath, os);
+      this.logger.info(`Successfully executed script at ${filePath}`);
+    } catch (error) {
+      this.logger.error(`Error executing script: ${error.message}`, error);
+      throw error;
+    }
+  }
+
+  private async createTemporaryFile(
+    fileName: string,
+    tempScriptFolderName: string,
+    contents: string,
+  ): Promise<string> {
+    const directoryPath = this.system.location.combinePaths(
       this.system.operatingSystem.getTempDirectory(),
-      folderName,
+      tempScriptFolderName,
     );
-    await this.system.fileSystem.createDirectory(dir, true);
-    const filePath = this.system.location.combinePaths(dir, `run.${fileExtension}`);
-    await this.system.fileSystem.writeToFile(filePath, code);
-    await this.system.fileSystem.setFilePermissions(filePath, '755');
+    await this.createDirectoryIfNotExists(directoryPath);
+    const filePath = this.system.location.combinePaths(directoryPath, fileName);
+    await this.createFile(filePath, contents);
+    return filePath;
+  }
+
+  private async createFile(filePath: string, contents: string): Promise<void> {
+    this.logger.info(`Creating file at ${filePath}, size: ${contents.length} characters`);
+    await this.system.fileSystem.writeToFile(filePath, contents);
+    this.logger.info(`File created successfully at ${filePath}`);
+  }
+
+  private async createDirectoryIfNotExists(directoryPath: string): Promise<void> {
+    this.logger.info(`Checking and ensuring directory exists: ${directoryPath}`);
+    await this.system.fileSystem.createDirectory(directoryPath, true);
+    this.logger.info(`Directory confirmed at: ${directoryPath}`);
+  }
+
+  private async executeFile(filePath: string, os: OperatingSystem): Promise<void> {
+    await this.setFileExecutablePermissions(filePath);
     const command = getExecuteCommand(filePath, os);
+    await this.executeCommand(command);
+  }
+
+  private async setFileExecutablePermissions(filePath: string): Promise<void> {
+    this.logger.info(`Setting execution permissions for file at ${filePath}`);
+    await this.system.fileSystem.setFilePermissions(filePath, '755');
+    this.logger.info(`Execution permissions set successfully for ${filePath}`);
+  }
+
+  private async executeCommand(command: string): Promise<void> {
+    this.logger.info(`Executing command: ${command}`);
     await this.system.command.execute(command);
+    this.logger.info('Command executed successfully.');
   }
 }
 
 function getExecuteCommand(
   scriptPath: string,
-  currentOperatingSystem: OperatingSystem,
+  os: OperatingSystem,
 ): string {
-  switch (currentOperatingSystem) {
+  switch (os) {
     case OperatingSystem.Linux:
       return `x-terminal-emulator -e '${scriptPath}'`;
     case OperatingSystem.macOS:
@@ -42,6 +93,6 @@ function getExecuteCommand(
     case OperatingSystem.Windows:
       return scriptPath;
     default:
-      throw Error(`unsupported os: ${OperatingSystem[currentOperatingSystem]}`);
+      throw Error(`unsupported os: ${OperatingSystem[os]}`);
   }
 }

src/presentation/components/Code/CodeButtons/CodeRunButton.vue

@@ -30,7 +30,6 @@ export default defineComponent({
       await codeRunner.runCode(
         currentContext.state.code.current,
         currentContext.app.info.name,
-        currentState.value.collection.scripting.fileExtension,
         os,
       );
     }

tests/e2e/operating-system-selector.cy.ts

@@ -2,6 +2,7 @@ import { ViewType } from '@/presentation/components/Scripts/Menu/View/ViewType';
 import { getEnumValues } from '@/application/Common/Enum';
 import { OperatingSystem } from '@/domain/OperatingSystem';
 import { getOperatingSystemDisplayName } from '@/presentation/components/Shared/OperatingSystemNames';
+import { AllSupportedOperatingSystems } from '@tests/shared/TestCases/SupportedOperatingSystems';
 
 describe('operating system selector', () => {
   // Regression test for a bug where switching between operating systems caused uncaught exceptions.
@@ -29,11 +30,7 @@ function getSupportedOperatingSystemsList() {
       the application within Cypress, as its compilation is tightly coupled with Vite.
       Ideally, this should dynamically fetch the list from the compiled application.
   */
-  return [
-    OperatingSystem.Windows,
-    OperatingSystem.Linux,
-    OperatingSystem.macOS,
-  ];
+  return AllSupportedOperatingSystems;
 }
 
 function assertExpectedActions() {

tests/shared/TestCases/SupportedOperatingSystems.ts

@@ -0,0 +1,11 @@
+import { OperatingSystem } from '@/domain/OperatingSystem';
+
+export type SupportedOperatingSystem = OperatingSystem.Windows
+| OperatingSystem.Linux
+| OperatingSystem.macOS;
+
+export const AllSupportedOperatingSystems: readonly OperatingSystem[] = [
+  OperatingSystem.Windows,
+  OperatingSystem.Linux,
+  OperatingSystem.macOS,
+] as const;

tests/unit/domain/ProjectInformation.spec.ts

@@ -5,6 +5,7 @@ import { EnumRangeTestRunner } from '@tests/unit/application/Common/EnumRangeTes
 import { VersionStub } from '@tests/unit/shared/Stubs/VersionStub';
 import { Version } from '@/domain/Version';
 import { PropertyKeys } from '@/TypeHelpers';
+import { SupportedOperatingSystem, AllSupportedOperatingSystems } from '@tests/shared/TestCases/SupportedOperatingSystems';
 
 describe('ProjectInformation', () => {
   describe('retrieval of property values', () => {
@@ -117,48 +118,42 @@ describe('ProjectInformation', () => {
       });
     });
   });
-  describe('correct retrieval of download URL per operating system', () => {
-    const testCases: ReadonlyArray<{
-      readonly os: OperatingSystem,
+  describe('correct retrieval of download URL for every supported operating system', () => {
+    const testCases: Record<SupportedOperatingSystem, {
       readonly expected: string,
       readonly repositoryUrl: string,
       readonly version: string,
-    }> = [
-      {
-        os: OperatingSystem.macOS,
+    }> = {
+      [OperatingSystem.macOS]: {
         expected: 'https://github.com/undergroundwires/privacy.sexy/releases/download/0.7.2/privacy.sexy-0.7.2.dmg',
         repositoryUrl: 'https://github.com/undergroundwires/privacy.sexy.git',
         version: '0.7.2',
       },
-      {
-        os: OperatingSystem.Linux,
+      [OperatingSystem.Linux]: {
         expected: 'https://github.com/undergroundwires/privacy.sexy/releases/download/0.7.2/privacy.sexy-0.7.2.AppImage',
         repositoryUrl: 'https://github.com/undergroundwires/privacy.sexy.git',
         version: '0.7.2',
       },
-      {
-        os: OperatingSystem.Windows,
+      [OperatingSystem.Windows]: {
         expected: 'https://github.com/undergroundwires/privacy.sexy/releases/download/0.7.2/privacy.sexy-Setup-0.7.2.exe',
         repositoryUrl: 'https://github.com/undergroundwires/privacy.sexy.git',
         version: '0.7.2',
       },
-    ];
-    for (const testCase of testCases) {
-      it(`should return the expected download URL for ${OperatingSystem[testCase.os]}`, () => {
+    };
+    AllSupportedOperatingSystems.forEach((operatingSystem) => {
+      it(`should return the expected download URL for ${OperatingSystem[operatingSystem]}`, () => {
         // arrange
-        const {
-          expected, version, repositoryUrl, os,
-        } = testCase;
+        const { expected, version, repositoryUrl } = testCases[operatingSystem];
         const sut = new ProjectInformationBuilder()
           .withVersion(new VersionStub(version))
           .withRepositoryUrl(repositoryUrl)
           .build();
         // act
-        const actual = sut.getDownloadUrl(os);
+        const actual = sut.getDownloadUrl(operatingSystem);
         // assert
         expect(actual).to.equal(expected);
       });
-    }
+    });
     describe('should throw an error when provided with an invalid operating system', () => {
       // arrange
       const sut = new ProjectInformationBuilder()

tests/unit/infrastructure/CodeRunner/FileNameGenerator.spec.ts

@@ -0,0 +1,84 @@
+import { describe, it, expect } from 'vitest';
+import { AllSupportedOperatingSystems, SupportedOperatingSystem } from '@tests/shared/TestCases/SupportedOperatingSystems';
+import { OperatingSystem } from '@/domain/OperatingSystem';
+import { generateOsTimestampedFileName } from '@/infrastructure/CodeRunner/FileNameGenerator';
+import { formatAssertionMessage } from '@tests/shared/FormatAssertionMessage';
+
+describe('FileNameGenerator', () => {
+  describe('generateOsTimestampedFileName', () => {
+    it('generates correct prefix', () => {
+      // arrange
+      const expectedPrefix = 'run';
+      // act
+      const fileName = generateFileNamePartsForTesting();
+      // assert
+      expect(fileName.prefix).to.equal(expectedPrefix);
+    });
+    it('generates correct timestamp', () => {
+      // arrange
+      const currentDate = '2023-01-01T12:00:00.000Z';
+      const expectedTimestamp = '2023-01-01_12-00-00';
+      const date = new Date(currentDate);
+      // act
+      const fileName = generateFileNamePartsForTesting({ date });
+      // assert
+      expect(fileName.timestamp).to.equal(expectedTimestamp, formatAssertionMessage[
+        `Generated file name: ${fileName.generatedFileName}`
+      ]);
+    });
+    describe('generates correct extension', () => {
+      const testScenarios: Record<SupportedOperatingSystem, string> = {
+        [OperatingSystem.Windows]: 'bat',
+        [OperatingSystem.Linux]: 'sh',
+        [OperatingSystem.macOS]: 'sh',
+      };
+      AllSupportedOperatingSystems.forEach((operatingSystem) => {
+        it(`on ${OperatingSystem[operatingSystem]}`, () => {
+          // arrange
+          const expectedExtension = testScenarios[operatingSystem];
+          // act
+          const fileName = generateFileNamePartsForTesting({ operatingSystem });
+          // assert
+          expect(fileName.extension).to.equal(expectedExtension, formatAssertionMessage[
+            `Generated file name: ${fileName.generatedFileName}`
+          ]);
+        });
+      });
+    });
+    it('generates filename without extension for unknown OS', () => {
+      // arrange
+      const unknownOs = 'Unknown' as unknown as OperatingSystem;
+      // act
+      const fileName = generateFileNamePartsForTesting({ operatingSystem: unknownOs });
+      // assert
+      expect(fileName.extension).toBeUndefined();
+    });
+  });
+});
+
+interface TestFileNameComponents {
+  readonly prefix: string;
+  readonly timestamp: string;
+  readonly extension?: string;
+  readonly generatedFileName: string;
+}
+
+function generateFileNamePartsForTesting(testScenario?: {
+  operatingSystem?: OperatingSystem,
+  date?: Date,
+}): TestFileNameComponents {
+  const operatingSystem = testScenario?.operatingSystem ?? OperatingSystem.Windows;
+  const date = testScenario?.date ?? new Date();
+  const fileName = generateOsTimestampedFileName(operatingSystem, date);
+  const pattern = /^(?<prefix>[^-]+)-(?<timestamp>[^.]+)(?:\.(?<extension>[^.]+))?$/; // prefix-timestamp.extension
+  const match = fileName.match(pattern);
+  if (!match?.groups?.prefix || !match?.groups?.timestamp) {
+    throw new Error(`Failed to parse prefix or timestamp: ${fileName}`);
+  }
+  return {
+    generatedFileName: fileName,
+    prefix: match.groups.prefix,
+    timestamp: match.groups.timestamp,
+    extension: match.groups.extension,
+  };
+}

tests/unit/infrastructure/CodeRunner/TemporaryFileCodeRunner.spec.ts

@@ -1,7 +1,7 @@
 import { describe, it, expect } from 'vitest';
 import { OperatingSystem } from '@/domain/OperatingSystem';
 import { FileSystemOps, SystemOperations } from '@/infrastructure/CodeRunner/SystemOperations/SystemOperations';
-import { TemporaryFileCodeRunner } from '@/infrastructure/CodeRunner/TemporaryFileCodeRunner';
+import { FileNameGenerator, TemporaryFileCodeRunner } from '@/infrastructure/CodeRunner/TemporaryFileCodeRunner';
 import { expectThrowsAsync } from '@tests/shared/Assertions/ExpectThrowsAsync';
 import { SystemOperationsStub } from '@tests/unit/shared/Stubs/SystemOperationsStub';
 import { OperatingSystemOpsStub } from '@tests/unit/shared/Stubs/OperatingSystemOpsStub';
@@ -9,9 +9,14 @@ import { LocationOpsStub } from '@tests/unit/shared/Stubs/LocationOpsStub';
 import { FileSystemOpsStub } from '@tests/unit/shared/Stubs/FileSystemOpsStub';
 import { CommandOpsStub } from '@tests/unit/shared/Stubs/CommandOpsStub';
 import { FunctionKeys } from '@/TypeHelpers';
+import { AllSupportedOperatingSystems, SupportedOperatingSystem } from '@tests/shared/TestCases/SupportedOperatingSystems';
+import { formatAssertionMessage } from '@tests/shared/FormatAssertionMessage';
+import { LoggerStub } from '@tests/unit/shared/Stubs/LoggerStub';
+import { Logger } from '@/application/Common/Log/Logger';
 
 describe('TemporaryFileCodeRunner', () => {
   describe('runCode', () => {
+    describe('directory creation', () => {
       it('creates temporary directory recursively', async () => {
         // arrange
         const expectedDir = 'expected-dir';
@@ -20,7 +25,7 @@ describe('TemporaryFileCodeRunner', () => {
         const folderName = 'privacy.sexy';
         const temporaryDirName = 'tmp';
         const filesystem = new FileSystemOpsStub();
-      const context = new TestContext()
+        const context = new CodeRunnerTestSetup()
           .withSystemOperationsStub((ops) => ops
             .withOperatingSystem(
               new OperatingSystemOpsStub()
@@ -44,54 +49,133 @@ describe('TemporaryFileCodeRunner', () => {
         expect(actualPath).to.equal(expectedDir);
         expect(actualIsRecursive).to.equal(expectedIsRecursive);
       });
-    it('creates a file with expected code and path', async () => {
+    });
+    describe('file creation', () => {
+      it('creates a file with expected code', async () => {
         // arrange
         const expectedCode = 'expected-code';
-      const expectedFilePath = 'expected-file-path';
-
         const filesystem = new FileSystemOpsStub();
-      const extension = '.sh';
-      const expectedName = `run.${extension}`;
-      const folderName = 'privacy.sexy';
-      const temporaryDirName = 'tmp';
-      const context = new TestContext()
+        const context = new CodeRunnerTestSetup()
           .withSystemOperationsStub((ops) => ops
-          .withOperatingSystem(
-            new OperatingSystemOpsStub()
-              .withTemporaryDirectoryResult(temporaryDirName),
-          )
-          .withLocation(
-            new LocationOpsStub()
-              .withJoinResult('folder', temporaryDirName, folderName)
-              .withJoinResult(expectedFilePath, 'folder', expectedName),
-          )
             .withFileSystem(filesystem));
-
         // act
         await context
           .withCode(expectedCode)
-        .withFolderName(folderName)
-        .withExtension(extension)
           .runCode();
 
         // assert
         const calls = filesystem.callHistory.filter((call) => call.methodName === 'writeToFile');
         expect(calls.length).to.equal(1);
-      const [actualFilePath, actualData] = calls[0].args;
-      expect(actualFilePath).to.equal(expectedFilePath);
+        const [, actualData] = calls[0].args;
         expect(actualData).to.equal(expectedCode);
       });
-    it('set file permissions as expected', async () => {
+      it('generates file name for correct operating system', async () => {
+        // arrange
+        const expectedOperatingSystem = OperatingSystem.macOS;
+        const calls = new Array<OperatingSystem>();
+        const fileNameGenerator: FileNameGenerator = (operatingSystem) => {
+          calls.push(operatingSystem);
+          return 'unimportant file name';
+        };
+        const context = new CodeRunnerTestSetup()
+          .withOs(expectedOperatingSystem)
+          .withFileNameGenerator(fileNameGenerator);
+
+        // act
+        await context.runCode();
+
+        // assert
+        expect(calls).to.have.lengthOf(1);
+        const [actualOperatingSystem] = calls;
+        expect(actualOperatingSystem).to.equal(expectedOperatingSystem);
+      });
+      it('creates file in expected directory', async () => {
+        // arrange
+        const pathSegmentSeparator = '/PATH-SEGMENT-SEPARATOR/';
+        const temporaryDirName = '/tmp';
+        const folderName = 'privacy.sexy';
+        const expectedDirectory = [temporaryDirName, folderName].join(pathSegmentSeparator);
+        const filesystem = new FileSystemOpsStub();
+        const context = new CodeRunnerTestSetup()
+          .withSystemOperationsStub((ops) => ops
+            .withOperatingSystem(
+              new OperatingSystemOpsStub()
+                .withTemporaryDirectoryResult(temporaryDirName),
+            )
+            .withLocation(
+              new LocationOpsStub().withDefaultSeparator(pathSegmentSeparator),
+            )
+            .withFileSystem(filesystem));
+
+        // act
+        await context
+          .withFolderName(folderName)
+          .runCode();
+
+        // assert
+        const calls = filesystem.callHistory.filter((call) => call.methodName === 'writeToFile');
+        expect(calls.length).to.equal(1);
+        const [actualFilePath] = calls[0].args;
+        const actualDirectory = actualFilePath
+          .split(pathSegmentSeparator)
+          .slice(0, -1)
+          .join(pathSegmentSeparator);
+        expect(actualDirectory).to.equal(expectedDirectory, formatAssertionMessage([
+          `Actual file path: ${actualFilePath}`,
+        ]));
+      });
+      it('creates file with expected file name', async () => {
+        // arrange
+        const pathSegmentSeparator = '/PATH-SEGMENT-SEPARATOR/';
+        const filesystem = new FileSystemOpsStub();
+        const expectedFileName = 'expected-script-file-name';
+        const context = new CodeRunnerTestSetup()
+          .withFileNameGenerator(() => expectedFileName)
+          .withSystemOperationsStub((ops) => ops
+            .withFileSystem(filesystem)
+            .withLocation(new LocationOpsStub().withDefaultSeparator(pathSegmentSeparator)));
+
+        // act
+        await context.runCode();
+
+        // assert
+        const calls = filesystem.callHistory.filter((call) => call.methodName === 'writeToFile');
+        expect(calls.length).to.equal(1);
+        const [actualFilePath] = calls[0].args;
+        const actualFileName = actualFilePath
+          .split(pathSegmentSeparator)
+          .pop();
+        expect(actualFileName).to.equal(actualFileName, formatAssertionMessage([
+          `Actual file path: ${actualFilePath}`,
+        ]));
+      });
+    });
+    describe('file permissions', () => {
+      it('sets correct permissions', async () => {
         // arrange
         const expectedMode = '755';
-      const expectedFilePath = 'expected-file-path';
+        const filesystem = new FileSystemOpsStub();
+        const context = new CodeRunnerTestSetup()
+          .withSystemOperationsStub((ops) => ops.withFileSystem(filesystem));
 
+        // act
+        await context.runCode();
+
+        // assert
+        const calls = filesystem.callHistory.filter((call) => call.methodName === 'setFilePermissions');
+        expect(calls.length).to.equal(1);
+        const [, actualMode] = calls[0].args;
+        expect(actualMode).to.equal(expectedMode);
+      });
+      it('sets correct permissions on correct file', async () => {
+        // arrange
+        const expectedFilePath = 'expected-file-path';
         const filesystem = new FileSystemOpsStub();
         const extension = '.sh';
         const expectedName = `run.${extension}`;
         const folderName = 'privacy.sexy';
         const temporaryDirName = 'tmp';
-      const context = new TestContext()
+        const context = new CodeRunnerTestSetup()
           .withSystemOperationsStub((ops) => ops
             .withOperatingSystem(
               new OperatingSystemOpsStub()
@@ -107,41 +191,32 @@ describe('TemporaryFileCodeRunner', () => {
         // act
         await context
           .withFolderName(folderName)
-        .withExtension(extension)
+          .withFileNameGenerator(() => expectedName)
           .runCode();
 
         // assert
         const calls = filesystem.callHistory.filter((call) => call.methodName === 'setFilePermissions');
         expect(calls.length).to.equal(1);
-      const [actualFilePath, actualMode] = calls[0].args;
+        const [actualFilePath] = calls[0].args;
         expect(actualFilePath).to.equal(expectedFilePath);
-      expect(actualMode).to.equal(expectedMode);
       });
-    describe('executes as expected', () => {
+    });
+    describe('file execution', () => {
+      describe('executes correct command', () => {
         // arrange
-      const filePath = 'expected-file-path';
-      interface ExecutionTestCase {
-        readonly givenOs: OperatingSystem;
-        readonly expectedCommand: string;
-      }
-      const testData: readonly ExecutionTestCase[] = [
-        {
-          givenOs: OperatingSystem.Windows,
-          expectedCommand: filePath,
-        },
-        {
-          givenOs: OperatingSystem.macOS,
-          expectedCommand: `open -a Terminal.app ${filePath}`,
-        },
-        {
-          givenOs: OperatingSystem.Linux,
-          expectedCommand: `x-terminal-emulator -e '${filePath}'`,
-        },
-      ];
-      for (const { givenOs, expectedCommand } of testData) {
-        it(`returns ${expectedCommand} on ${OperatingSystem[givenOs]}`, async () => {
+        const filePath = 'executed-file-path';
+        const testScenarios: Record<SupportedOperatingSystem, string> = {
+          [OperatingSystem.Windows]: filePath,
+          [OperatingSystem.macOS]: `open -a Terminal.app ${filePath}`,
+          [OperatingSystem.Linux]: `x-terminal-emulator -e '${filePath}'`,
+        };
+        AllSupportedOperatingSystems.forEach((operatingSystem) => {
+          it(`returns correctly for ${OperatingSystem[operatingSystem]}`, async () => {
+            // arrange
+            const expectedCommand = testScenarios[operatingSystem];
             const command = new CommandOpsStub();
-          const context = new TestContext()
+            const context = new CodeRunnerTestSetup()
+              .withFileNameGenerator(() => filePath)
               .withSystemOperationsStub((ops) => ops
                 .withLocation(
                   new LocationOpsStub()
@@ -151,7 +226,7 @@ describe('TemporaryFileCodeRunner', () => {
 
             // act
             await context
-            .withOs(givenOs)
+              .withOs(operatingSystem)
               .runCode();
 
             // assert
@@ -160,7 +235,7 @@ describe('TemporaryFileCodeRunner', () => {
             const [actualCommand] = calls[0].args;
             expect(actualCommand).to.equal(expectedCommand);
           });
-      }
+        });
       });
       it('runs in expected order', async () => { // verifies correct `async`, `await` usage.
         const expectedOrder: readonly FunctionKeys<FileSystemOps>[] = [
@@ -169,7 +244,7 @@ describe('TemporaryFileCodeRunner', () => {
           'setFilePermissions',
         ];
         const fileSystem = new FileSystemOpsStub();
-      const context = new TestContext()
+        const context = new CodeRunnerTestSetup()
           .withSystemOperationsStub((ops) => ops
             .withFileSystem(fileSystem));
 
@@ -182,6 +257,7 @@ describe('TemporaryFileCodeRunner', () => {
           .filter((command) => expectedOrder.includes(command));
         expect(expectedOrder).to.deep.equal(actualOrder);
       });
+    });
     describe('throws with invalid OS', () => {
       const testScenarios: ReadonlyArray<{
         readonly description: string;
@@ -200,7 +276,7 @@ describe('TemporaryFileCodeRunner', () => {
       testScenarios.forEach(({ description, invalidOs, expectedError }) => {
         it(description, async () => {
           // arrange
-          const context = new TestContext()
+          const context = new CodeRunnerTestSetup()
             .withOs(invalidOs);
           // act
           const act = async () => { await context.runCode(); };
@@ -212,20 +288,26 @@ describe('TemporaryFileCodeRunner', () => {
   });
 });
 
-class TestContext {
-  private code = 'code';
+class CodeRunnerTestSetup {
+  private code = `[${CodeRunnerTestSetup.name}]code`;
 
-  private folderName = 'folderName';
+  private folderName = `[${CodeRunnerTestSetup.name}]folderName`;
 
-  private fileExtension = 'fileExtension';
+  private fileNameGenerator: FileNameGenerator = () => `[${CodeRunnerTestSetup.name}]file-name-stub`;
 
   private os: OperatingSystem = OperatingSystem.Windows;
 
   private systemOperations: SystemOperations = new SystemOperationsStub();
 
+  private logger: Logger = new LoggerStub();
+
   public async runCode(): Promise<void> {
-    const runner = new TemporaryFileCodeRunner(this.systemOperations);
-    await runner.runCode(this.code, this.folderName, this.fileExtension, this.os);
+    const runner = new TemporaryFileCodeRunner(
+      this.systemOperations,
+      this.fileNameGenerator,
+      this.logger,
+    );
+    await runner.runCode(this.code, this.folderName, this.os);
   }
 
   public withSystemOperations(
@@ -257,8 +339,8 @@ class TestContext {
     return this;
   }
 
-  public withExtension(fileExtension: string): this {
-    this.fileExtension = fileExtension;
+  public withFileNameGenerator(fileNameGenerator: FileNameGenerator): this {
+    this.fileNameGenerator = fileNameGenerator;
     return this;
   }
 }

tests/unit/presentation/components/Code/CodeButtons/Save/Instructions/InstructionListDataFactory.spec.ts

@@ -3,15 +3,15 @@ import { OperatingSystem } from '@/domain/OperatingSystem';
 import { getInstructions } from '@/presentation/components/Code/CodeButtons/Save/Instructions/InstructionListDataFactory';
 import { getEnumValues } from '@/application/Common/Enum';
 import { InstructionsBuilder } from '@/presentation/components/Code/CodeButtons/Save/Instructions/Data/InstructionsBuilder';
+import { AllSupportedOperatingSystems } from '@tests/shared/TestCases/SupportedOperatingSystems';
 
 describe('InstructionListDataFactory', () => {
-  const supportedOsList = [OperatingSystem.macOS, OperatingSystem.Linux];
   describe('getInstructions', () => {
     it('returns expected if os is supported', () => {
       // arrange
       const fileName = 'test.file';
       // act
-      const actualResults = supportedOsList.map((os) => getInstructions(os, fileName));
+      const actualResults = AllSupportedOperatingSystems.map((os) => getInstructions(os, fileName));
       // assert
       expect(actualResults.every((result) => result instanceof InstructionsBuilder));
     });
@@ -20,7 +20,7 @@ describe('InstructionListDataFactory', () => {
       const expected = undefined;
       const fileName = 'test.file';
       const unsupportedOses = getEnumValues(OperatingSystem)
-        .filter((value) => !supportedOsList.includes(value));
+        .filter((value) => !AllSupportedOperatingSystems.includes(value));
       // act
       const actualResults = unsupportedOses.map((os) => getInstructions(os, fileName));
       // assert

tests/unit/shared/Stubs/LocationOpsStub.ts

@@ -8,6 +8,8 @@ export class LocationOpsStub
 
   private scenarios = new Map<string, string>();
 
+  private defaultSeparator = `/[${LocationOpsStub.name}]PATH-SEGMENT-SEPARATOR/`;
+
   public withJoinResult(returnValue: string, ...paths: string[]): this {
     this.scenarios.set(LocationOpsStub.getScenarioKey(paths), returnValue);
     return this;
@@ -19,6 +21,11 @@ export class LocationOpsStub
     return this;
   }
 
+  public withDefaultSeparator(defaultSeparator: string): this {
+    this.defaultSeparator = defaultSeparator;
+    return this;
+  }
+
   public combinePaths(...pathSegments: string[]): string {
     this.registerMethodCall({
       methodName: 'combinePaths',
@@ -33,7 +40,7 @@ export class LocationOpsStub
     if (foundScenario) {
       return foundScenario;
     }
-    return pathSegments.join('/PATH-SEGMENT-SEPARATOR/');
+    return pathSegments.join(this.defaultSeparator);
   }
 
   private static getScenarioKey(paths: string[]): string {