Add tests for loading environment variables from a file

tests/cli/packages/cli/env.test.js

@@ -0,0 +1,56 @@
+import { describe, it, beforeEach } from 'node:test';
+import * as assert from "node:assert";
+import makeCliApplication from "./helpers/makeCliApplication.js";
+import { Env } from "@aedart/support/env";
+
+describe('@aedart/cli', () => {
+
+    describe('env', () => {
+
+        beforeEach(() => {
+            Env.clear();
+        });
+
+        it('loads default .env file', async () => {
+            const cli = makeCliApplication({
+                writeOut: () => {
+                    // Ignore output
+                }
+            });
+            const core = cli.core;
+
+            let hasLoadedEnv = false;
+            core.destroying(() => {
+                hasLoadedEnv = Env.get('APP_ENV') === 'testing';
+            });
+
+            // --------------------------------------------------------------- //
+
+            await cli.run([], { from: 'user' });
+
+            assert.ok(hasLoadedEnv, 'environment file not loaded');
+        });
+
+        it('can load custom environment file', async () => {
+            const cli = makeCliApplication({
+                writeOut: () => {
+                    // Ignore output
+                }
+            });
+            const core = cli.core;
+
+            let hasLoadedEnv = false;
+            core.destroying(() => {
+                hasLoadedEnv = Env.get('CUSTOM_KEY') === 'custom';
+            });
+
+            // --------------------------------------------------------------- //
+
+            await cli.run([
+                '--env=tests/cli/packages/cli/fixtures/.custom'
+            ], { from: 'user' });
+
+            assert.ok(hasLoadedEnv, 'custom environment file not loaded');
+        });
+    });
+});

tests/cli/packages/cli/fixtures/.custom

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+# Custom environment file
+
+# Application Environment
+# NOTE: Key might NOT be set, if previously defined in `process.env`!
+APP_ENV=custom
+
+# A custom key...
+CUSTOM_KEY=custom