fixup! .corepack.env as a lock file

Author: aduh95

tests/Up.test.ts

@@ -1,5 +1,6 @@
 import {ppath, xfs, npath}                from '@yarnpkg/fslib';
 import process                            from 'node:process';
+import {parseEnv}                         from 'node:util';
 import {describe, beforeEach, it, expect} from 'vitest';
 
 import {runCli}                           from './_runCli';
@@ -91,4 +92,42 @@ describe(`UpCommand`, () => {
       });
     });
   });
+
+  it(`should update the ".corepack.env" file from the current project`, async t => {
+    // Skip that test on Node.js 18.x as it lacks support for .env files.
+    if (process.version.startsWith(`v18.`)) t.skip();
+    await Promise.all([
+      `COREPACK_DEV_ENGINES_YARN=1.1.0\n`,
+      `\nCOREPACK_DEV_ENGINES_YARN=1.1.0\n`,
+      `COREPACK_DEV_ENGINES_YARN=1.1.0`,
+      `\nCOREPACK_DEV_ENGINES_YARN=1.1.0`,
+      `FOO=bar\nCOREPACK_DEV_ENGINES_YARN=1.1.0\n`,
+      `FOO=bar\nCOREPACK_DEV_ENGINES_YARN=1.1.0`,
+    ].map(originalEnv => xfs.mktempPromise(async cwd => {
+      await xfs.writeJsonPromise(ppath.join(cwd, `package.json`), {
+        devEngines: {packageManager: {name: `yarn`, version: `1.x || 2.x`}},
+      });
+      await xfs.writeFilePromise(ppath.join(cwd, `.corepack.env`), originalEnv);
+
+      await expect(runCli(cwd, [`up`])).resolves.toMatchObject({
+        exitCode: 0,
+        stderr: ``,
+        stdout: expect.stringMatching(/^Installing yarn@2\.4\.3 in the project\.\.\.\n\n➤ YN0000: (.*\n)+➤ YN0000: Done in \d+s \d+ms\n$/),
+      });
+
+      try {
+        await expect(xfs.readFilePromise(ppath.join(cwd, `.corepack.env`), `utf-8`).then(parseEnv)).resolves.toMatchObject({
+          COREPACK_DEV_ENGINES_YARN: `2.4.3+sha512.8dd9fedc5451829619e526c56f42609ad88ae4776d9d3f9456d578ac085115c0c2f0fb02bb7d57fd2e1b6e1ac96efba35e80a20a056668f61c96934f67694fd0`,
+        });
+      } catch (cause) {
+        throw new Error(JSON.stringify(originalEnv), {cause});
+      }
+
+      await expect(runCli(cwd, [`yarn`, `--version`])).resolves.toMatchObject({
+        exitCode: 0,
+        stdout: `2.4.3\n`,
+        stderr: ``,
+      });
+    })));
+  });
 });

tests/Use.test.ts

@@ -190,4 +190,43 @@ describe(`UseCommand`, () => {
       });
     }
   });
+
+  it(`should update the ".corepack.env" file from the current project`, async t => {
+    // Skip that test on Node.js 18.x as it lacks support for .env files.
+    if (process.version.startsWith(`v18.`)) t.skip();
+    await Promise.all([
+      `COREPACK_DEV_ENGINES_YARN=2.1.0\n`,
+      `\nCOREPACK_DEV_ENGINES_YARN=2.1.0\n`,
+      `COREPACK_DEV_ENGINES_YARN=2.1.0`,
+      `\nCOREPACK_DEV_ENGINES_YARN=2.1.0`,
+      `FOO=bar\nCOREPACK_DEV_ENGINES_YARN=2.1.0\n`,
+      `FOO=bar\nCOREPACK_DEV_ENGINES_YARN=2.1.0`,
+    ].map(originalEnv => xfs.mktempPromise(async cwd => {
+      await xfs.writeJsonPromise(ppath.join(cwd, `package.json`), {
+        devEngines: {packageManager: {name: `yarn`, version: `1.x || 2.x`}},
+        license: `MIT`, // To avoid Yarn warning.
+      });
+      await xfs.writeFilePromise(ppath.join(cwd, `.corepack.env`), originalEnv);
+
+      await expect(runCli(cwd, [`use`, `[email protected]`])).resolves.toMatchObject({
+        exitCode: 0,
+        stderr: ``,
+        stdout: expect.stringMatching(/^Installing yarn@1\.22\.4 in the project\.\.\.\n\nyarn install v1\.22\.4\ninfo No lockfile found\.\n(.*\n)+Done in \d+\.\d+s\.\n$/),
+      });
+
+      try {
+        await expect(xfs.readFilePromise(ppath.join(cwd, `.corepack.env`), `utf-8`).then(parseEnv)).resolves.toMatchObject({
+          COREPACK_DEV_ENGINES_YARN: `1.22.4+sha512.a1833b862fe52169bd6c2a033045a07df5bc6a23595c259e675fed1b2d035ab37abe6ce309720abb6636d68f03615054b6292dc0a70da31c8697fda228b50d18`,
+        });
+      } catch (cause) {
+        throw new Error(JSON.stringify(originalEnv), {cause});
+      }
+
+      await expect(runCli(cwd, [`yarn`, `--version`])).resolves.toMatchObject({
+        exitCode: 0,
+        stdout: `1.22.4\n`,
+        stderr: ``,
+      });
+    })));
+  });
 });