Fixes #267 Add ActionSkipper

__tests__/ActionSkipper.test.ts

@@ -0,0 +1,44 @@
+import {ActionSkipper, ReleaseActionSkipper} from "../src/ActionSkipper";
+import {Releases} from "../src/Releases";
+
+describe("shouldSkip", () => {
+    const getMock = jest.fn()
+    const tag = "tag"
+    const MockReleases = jest.fn<Releases, any>(() => {
+        return {
+            create: jest.fn(),
+            deleteArtifact: jest.fn(),
+            getByTag: getMock,
+            listArtifactsForRelease: jest.fn(),
+            listReleases: jest.fn(),
+            update: jest.fn(),
+            uploadArtifact: jest.fn()
+        }
+    })
+
+    it('should return false when skipIfReleaseExists is false', async () => {
+        const actionSkipper = new ReleaseActionSkipper(false, MockReleases(), tag)
+        expect(await actionSkipper.shouldSkip()).toBe(false)
+    })
+
+    it('should return false when error occurs', async () => {
+        getMock.mockRejectedValue(new Error())
+
+        const actionSkipper = new ReleaseActionSkipper(true, MockReleases(), tag)
+        expect(await actionSkipper.shouldSkip()).toBe(false)
+    })
+
+    it('should return false when release does not exist', async () => {
+        getMock.mockResolvedValue({})
+        
+        const actionSkipper = new ReleaseActionSkipper(true, MockReleases(), tag)
+        expect(await actionSkipper.shouldSkip()).toBe(false)
+    })
+
+    it('should return true when release does exist', async () => {
+        getMock.mockResolvedValue({data: {}})
+
+        const actionSkipper = new ReleaseActionSkipper(true, MockReleases(), tag)
+        expect(await actionSkipper.shouldSkip()).toBe(true)
+    })
+})