Tests: add extension test runner

test/scripts/test-extension.test.ts

@@ -0,0 +1,50 @@
+import { execFileSync } from "node:child_process";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import { resolveExtensionTestPlan } from "../../scripts/test-extension.mjs";
+
+const scriptPath = path.join(process.cwd(), "scripts", "test-extension.mjs");
+
+function readPlan(args: string[], cwd = process.cwd()) {
+  const stdout = execFileSync(process.execPath, [scriptPath, ...args, "--dry-run", "--json"], {
+    cwd,
+    encoding: "utf8",
+  });
+  return JSON.parse(stdout) as ReturnType<typeof resolveExtensionTestPlan>;
+}
+
+describe("scripts/test-extension.mjs", () => {
+  it("resolves channel-root extensions onto the channel vitest config", () => {
+    const plan = resolveExtensionTestPlan({ targetArg: "slack", cwd: process.cwd() });
+
+    expect(plan.extensionId).toBe("slack");
+    expect(plan.extensionDir).toBe("extensions/slack");
+    expect(plan.config).toBe("vitest.channels.config.ts");
+    expect(plan.testFiles.some((file) => file.startsWith("extensions/slack/"))).toBe(true);
+  });
+
+  it("resolves provider extensions onto the extensions vitest config", () => {
+    const plan = resolveExtensionTestPlan({ targetArg: "firecrawl", cwd: process.cwd() });
+
+    expect(plan.extensionId).toBe("firecrawl");
+    expect(plan.config).toBe("vitest.extensions.config.ts");
+    expect(plan.testFiles.some((file) => file.startsWith("extensions/firecrawl/"))).toBe(true);
+  });
+
+  it("includes paired src roots when they contain tests", () => {
+    const plan = resolveExtensionTestPlan({ targetArg: "line", cwd: process.cwd() });
+
+    expect(plan.roots).toContain("extensions/line");
+    expect(plan.roots).toContain("src/line");
+    expect(plan.config).toBe("vitest.channels.config.ts");
+    expect(plan.testFiles.some((file) => file.startsWith("src/line/"))).toBe(true);
+  });
+
+  it("infers the extension from the current working directory", () => {
+    const cwd = path.join(process.cwd(), "extensions", "slack");
+    const plan = readPlan([], cwd);
+
+    expect(plan.extensionId).toBe("slack");
+    expect(plan.extensionDir).toBe("extensions/slack");
+  });
+});