Implement the "publish-action" action

__tests__/api-utils.test.ts

@@ -0,0 +1,39 @@
+import * as github from "@actions/github";
+import * as apiUtils from "../src/api-utils";
+
+const prereleaseData = require("./data/pre-release.json");
+const releaseData = require("./data/release.json");
+
+const token = "faketoken";
+const octokitClient = github.getOctokit(token);
+
+let getReleaseSpy: jest.SpyInstance;
+
+process.env.GITHUB_REPOSITORY = "test/repository";
+
+describe("validateIfReleaseIsPublished", () => {
+    beforeEach(() => {
+        getReleaseSpy = jest.spyOn(octokitClient.repos, "getReleaseByTag");
+    });
+
+    it("throw if release is marked as pre-release", async () => {
+        getReleaseSpy.mockReturnValue(prereleaseData);
+        
+        expect.assertions(1);
+        await expect(apiUtils.validateIfReleaseIsPublished("v1.0.0", octokitClient)).rejects.toThrowError(
+            "The 'v1.0.0' release is marked as pre-release. Updating tags for pre-release is not supported"
+        );
+    });
+
+    it("validate that release is published", async () => {
+        getReleaseSpy.mockReturnValue(releaseData);
+
+        expect.assertions(1);
+        await expect(apiUtils.validateIfReleaseIsPublished("v1.1.0", octokitClient)).resolves.not.toThrow();
+    });
+
+    afterEach(() => {
+        jest.resetAllMocks();
+        jest.clearAllMocks();
+    });
+});