Add tests for the keyserver pool

Author: fwal

__tests__/gpg.test.ts

@@ -0,0 +1,47 @@
+import * as exec from "@actions/exec";
+import { setupKeys, verify, refreshKeys } from "../src/gpg";
+
+jest.mock("@actions/exec")
+
+const mockExec = exec.exec as jest.Mock
+
+describe("gpg", () => {
+
+  afterEach(() => {
+    mockExec.mockClear()
+  })
+
+  it('uses the first responding keyserver in the pool', async () => {
+    mockExec.mockImplementation(() => Promise.resolve(0))
+    await refreshKeys()
+    expect(mockExec).toBeCalledTimes(1)
+  })
+
+  it('uses the next keyserver in the pool if the previous fails', async () => {
+    const failingServers = 3
+    let testedServers = 0
+
+    mockExec.mockImplementation(() => {
+      testedServers++
+      if (testedServers >= failingServers) {
+        return Promise.resolve(0)
+      } else {
+        return Promise.resolve(1)
+      }
+    })
+
+    await refreshKeys()
+    expect(mockExec).toBeCalledTimes(3)
+  })
+
+  it('throws an error if all servers in the pool fails', async () => {
+    mockExec.mockImplementation(() => Promise.resolve(1))
+    
+    try {
+      await refreshKeys()
+    } catch (e) {
+      expect(e).toEqual(new Error("Failed to refresh keys from any server in the pool."));
+    }
+  })
+
+})