Add input tests

__tests__/Inputs.test.ts

@@ -5,19 +5,39 @@ import { Context } from "@actions/github/lib/context";
 
 
 jest.mock('@actions/core', () => {
-    return {getInput: mockGetInput};
+    return { getInput: mockGetInput };
 });
 
 describe('Inputs', () => {
-    let context: Context
-    let inputs: Inputs
+    let context: Context;
+    let inputs: Inputs;
     beforeEach(() => {
         context = new Context()
         inputs = new Inputs(context)
-        mockGetInput.mockReturnValue("")
     })
-    it('returns token', () => {
+
+    it('token method returns input token', () => {
         mockGetInput.mockReturnValue("42")
         expect(inputs.token).toBe("42")
     })
+
+    describe('tag', () => {
+        it('tag property returns input tag', () => {
+            mockGetInput.mockReturnValue("tag")
+            expect(inputs.tag).toBe("tag")
+        })
+        it('tag property returns context sha when input is empty', () => {
+            mockGetInput.mockReturnValue("")
+            context.ref = "refs/tags/sha-tag"
+            expect(inputs.tag).toBe("sha-tag")
+        })
+        it('tag property returns context sha when input is null', () => {
+            mockGetInput.mockReturnValue(null)
+            context.ref = "refs/tags/sha-tag"
+            expect(inputs.tag).toBe("sha-tag")
+        })
+        it('tag property throws if no tag', () => {
+            expect(() => inputs.tag).toThrow()
+        })
+    })
 })