find-unused-exports.test.mjs

import { strictEqual } from 'assert';
import { spawnSync } from 'child_process';
import { fileURLToPath } from 'url';
import snapshot from 'snapshot-assertion';
import replaceStackTraces from '../replaceStackTraces.mjs';

const FIND_UNUSED_EXPORTS_CLI_PATH = fileURLToPath(
  new URL('../../cli/find-unused-exports.mjs', import.meta.url)
);

export default (tests) => {
  tests.add('`find-unused-exports` CLI with no unused exports.', async () => {
    const { stdout, stderr, status, error } = spawnSync(
      'node',
      [FIND_UNUSED_EXPORTS_CLI_PATH],
      {
        cwd: fileURLToPath(
          new URL('../fixtures/no-unused-exports', import.meta.url)
        ),
        env: {
          ...process.env,
          FORCE_COLOR: 1,
        },
      }
    );

    if (error) throw error;

    await snapshot(
      stdout.toString(),
      new URL(
        '../snapshots/find-unused-exports/no-unused-exports-stdout.ans',
        import.meta.url
      )
    );
    strictEqual(stderr.toString(), '');
    strictEqual(status, 0);
  });

  tests.add('`find-unused-exports` CLI with some unused exports.', async () => {
    const { stdout, stderr, status, error } = spawnSync(
      'node',
      [FIND_UNUSED_EXPORTS_CLI_PATH],
      {
        cwd: fileURLToPath(
          new URL('../fixtures/some-unused-exports', import.meta.url)
        ),
        env: {
          ...process.env,
          FORCE_COLOR: 1,
        },
      }
    );

    if (error) throw error;

    strictEqual(stdout.toString(), '');
    await snapshot(
      stderr.toString(),
      new URL(
        '../snapshots/find-unused-exports/some-unused-exports-stderr.ans',
        import.meta.url
      )
    );
    strictEqual(status, 1);
  });

  tests.add('`find-unused-exports` CLI with arg `--module-glob`.', async () => {
    const { stdout, stderr, status, error } = spawnSync(
      'node',
      [FIND_UNUSED_EXPORTS_CLI_PATH, '--module-glob', '**/*.txt'],
      {
        cwd: fileURLToPath(new URL('../fixtures/moduleGlob', import.meta.url)),
        env: {
          ...process.env,
          FORCE_COLOR: 1,
        },
      }
    );

    if (error) throw error;

    strictEqual(stdout.toString(), '');
    await snapshot(
      stderr.toString(),
      new URL(
        '../snapshots/find-unused-exports/module-glob-stderr.ans',
        import.meta.url
      )
    );
    strictEqual(status, 1);
  });

  tests.add(
    '`find-unused-exports` CLI with arg `--resolve-file-extensions`.',
    async () => {
      const { stdout, stderr, status, error } = spawnSync(
        'node',
        [
          FIND_UNUSED_EXPORTS_CLI_PATH,
          '--resolve-file-extensions',
          'mjs,a.mjs',
        ],
        {
          cwd: fileURLToPath(
            new URL(
              '../fixtures/extensionless-import-specifiers',
              import.meta.url
            )
          ),
          env: {
            ...process.env,
            FORCE_COLOR: 1,
          },
        }
      );

      if (error) throw error;

      strictEqual(stdout.toString(), '');
      await snapshot(
        stderr.toString(),
        new URL(
          '../snapshots/find-unused-exports/resolve-file-extensions-stderr.ans',
          import.meta.url
        )
      );
      strictEqual(status, 1);
    }
  );

  tests.add(
    '`find-unused-exports` CLI with args `--resolve-file-extensions` and `--resolve-index-files`.',
    async () => {
      const { stdout, stderr, status, error } = spawnSync(
        'node',
        [
          FIND_UNUSED_EXPORTS_CLI_PATH,
          '--resolve-file-extensions',
          'mjs,a.mjs',
          '--resolve-index-files',
        ],
        {
          cwd: fileURLToPath(
            new URL(
              '../fixtures/extensionless-import-specifiers-and-index-files',
              import.meta.url
            )
          ),
          env: {
            ...process.env,
            FORCE_COLOR: 1,
          },
        }
      );

      if (error) throw error;

      strictEqual(stdout.toString(), '');
      await snapshot(
        stderr.toString(),
        new URL(
          '../snapshots/find-unused-exports/resolve-file-extensions-and-index-files-stderr.ans',
          import.meta.url
        )
      );
      strictEqual(status, 1);
    }
  );

  tests.add(
    '`find-unused-exports` CLI with arg `--resolve-index-files` without using arg `--resolve-file-extensions`.',
    async () => {
      const { stdout, stderr, status, error } = spawnSync(
        'node',
        [FIND_UNUSED_EXPORTS_CLI_PATH, '--resolve-index-files'],
        {
          cwd: fileURLToPath(
            new URL(
              '../fixtures/extensionless-import-specifiers-and-index-files',
              import.meta.url
            )
          ),
          env: {
            ...process.env,
            FORCE_COLOR: 1,
          },
        }
      );

      if (error) throw error;

      strictEqual(stdout.toString(), '');
      await snapshot(
        stderr.toString(),
        new URL(
          '../snapshots/find-unused-exports/resolve-index-files-without-resolve-file-extensions-stderr.ans',
          import.meta.url
        )
      );
      strictEqual(status, 1);
    }
  );

  tests.add(
    '`find-unused-exports` CLI with a module Babel can’t parse.',
    async () => {
      const fixtureProjectPath = fileURLToPath(
        new URL('../fixtures/unparsable-module', import.meta.url)
      );
      const { stdout, stderr, status, error } = spawnSync(
        'node',
        [FIND_UNUSED_EXPORTS_CLI_PATH, '--module-glob', '**/*.txt'],
        {
          cwd: fixtureProjectPath,
          env: {
            ...process.env,
            FORCE_COLOR: 1,
          },
        }
      );

      if (error) throw error;

      strictEqual(stdout.toString(), '');
      await snapshot(
        replaceStackTraces(
          stderr.toString().replace(fixtureProjectPath, '<path>')
        ),
        new URL(
          '../snapshots/find-unused-exports/unparsable-module-stderr.ans',
          import.meta.url
        )
      );
      strictEqual(status, 1);
    }
  );
};