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.github/scripts/ensure-release-candidate-branches.test.mjs

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+import { describe, it, mock, before } from 'node:test';
+import assert from 'node:assert/strict';
+
+/**
+ * Run these tests by running
+ *
+ * node --test --experimental-test-module-mocks ./.github/scripts/ensure-release-candidate-branches.test.mjs
+ * */
+
+// mock.module must be called before the module under test is imported,
+// because static imports are hoisted and resolve before any code runs.
+mock.module('./github-helpers.mjs', {
+	namedExports: {
+		RELEASE_TRACKS: ['stable', 'beta', 'v1'],
+		RELEASE_PREFIX: 'n8n@',
+		resolveReleaseTagForTrack: (track) => {
+			// Always return deterministic data
+			if (track === 'stable') return { version: '2.9.2', tag: 'n8n@2.9.2' };
+			if (track === 'beta') return { version: '2.10.1', tag: 'n8n@2.10.1' };
+			return { version: '1.123.33', tag: 'n8n@1.123.33' };
+		},
+		writeGithubOutput: () => {}, // no-op in tests
+		sh: () => {}, // no-op in tests
+		getCommitForRef: () => {}, // no-op in tests
+		remoteBranchExists: () => {}, // no-op in tests
+		localRefExists: () => {}, // no-op in tests
+	},
+});
+
+let determineBranchChanges, tagVersionInfoToReleaseCandidateBranchName;
+before(async () => {
+	({ determineBranchChanges, tagVersionInfoToReleaseCandidateBranchName } = await import(
+		'./ensure-release-candidate-branches.mjs'
+	));
+});
+
+describe('Determine branch changes', () => {
+	it('Correctly determines ensureable branches', () => {
+		const output = determineBranchChanges();
+		const ensureBranches = output.branchesToEnsure.map(tagVersionInfoToReleaseCandidateBranchName);
+
+		assert.ok(
+			ensureBranches.includes('release-candidate/2.10.x'),
+			"Beta release-candidate branch doesn't exist",
+		);
+
+		assert.ok(
+			ensureBranches.includes('release-candidate/2.9.x'),
+			"Stable release-candidate branch doesn't exist",
+		);
+	});
+
+	it('Correctly determines deprecated branches', () => {
+		/** @type { import('./ensure-release-candidate-branches.mjs').BranchChanges} */
+		const output = determineBranchChanges();
+
+		assert.ok(
+			output.branchesToDeprecate.includes('release-candidate/2.7.x'),
+			'Existing branch release-candidate/2.7.x should be marked for removal',
+		);
+	});
+});