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.github/scripts/compute-backport-targets.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/compute-backport-targets.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: {
+		ensureEnvVar: () => {}, // no-op
+		readPrLabels: () => {}, // no-op
+		resolveRcBranchForTrack: mockResolveRcBranchForTrack,
+		writeGithubOutput: () => {}, //no-op
+	},
+});
+
+function mockResolveRcBranchForTrack(track) {
+	switch (track) {
+		case 'beta':
+			return 'release-candidate/2.10.1';
+		case 'stable':
+			return 'release-candidate/2.9.4';
+	}
+	return undefined;
+}
+
+let labelsToReleaseCandidateBranches;
+before(async () => {
+	({ labelsToReleaseCandidateBranches } = await import('./compute-backport-targets.mjs'));
+});
+
+describe('Compute backport targets', () => {
+	it('Finds backport branches for pointer tag labels', () => {
+		const labels = new Set(['Backport to Beta', 'Backport to Stable']);
+		/** @type { Set<string> } */
+		const result = labelsToReleaseCandidateBranches(labels);
+
+		assert.equal(result.size, 2);
+		assert.ok(result.has('release-candidate/2.10.1'));
+		assert.ok(result.has('release-candidate/2.9.4'));
+	});
+
+	it("Doesn't parse other labes to backport branches", () => {
+		const labels = new Set(['n8n team', 'release']);
+		/** @type { Set<string> } */
+		const result = labelsToReleaseCandidateBranches(labels);
+
+		assert.equal(result.size, 0);
+	});
+
+	it("Doesn't parse malformed backport labels", () => {
+		const labels = new Set(['Backport to Fork', 'Backport to my Home']);
+		/** @type { Set<string> } */
+		const result = labelsToReleaseCandidateBranches(labels);
+
+		assert.equal(result.size, 0);
+	});
+});