Fixes #32 Globber will now expand tilde and warn if no results are found

__tests__/ArtifactGlobber.test.ts

@@ -1,19 +1,45 @@
+const warnMock = jest.fn()
+
 import { FileArtifactGlobber } from "../src/ArtifactGlobber"
 import { Globber } from "../src/Globber";
 import { Artifact } from "../src/Artifact";
+import untildify = require("untildify");
 
 const contentType = "raw"
+const globMock = jest.fn()
 const globResults = ["file1", "file2"]
 
+jest.mock('@actions/core', () => {
+    return {warning: warnMock};
+})
+
 describe("ArtifactGlobber", () => {
-    it("globs simple path", () => {
+    beforeEach(() => {
+        globMock.mockClear()
+    })
+
+    it("expands paths in which start with a ~", () => {
         const globber = createArtifactGlobber()
 
         const expectedArtifacts =
             globResults.map((path) => new Artifact(path, contentType))
 
+        expect(globber.globArtifactString('~/path', 'raw'))
+            .toEqual(expectedArtifacts)
+        expect(globMock).toBeCalledWith(untildify('~/path'))
+        expect(warnMock).not.toBeCalled()
+    })
+    
+    it("globs simple path", () => {
+        const globber = createArtifactGlobber()
+
+        const expectedArtifacts =
+            globResults.map((path) => new Artifact(path, contentType))
+        
         expect(globber.globArtifactString('path', 'raw'))
             .toEqual(expectedArtifacts)
+        expect(globMock).toBeCalledWith('path')
+        expect(warnMock).not.toBeCalled()
     })
 
     it("splits multiple paths", () => {
@@ -26,14 +52,29 @@ describe("ArtifactGlobber", () => {
 
         expect(globber.globArtifactString('path1,path2', 'raw'))
             .toEqual(expectedArtifacts)
+        expect(globMock).toBeCalledWith('path1')
+        expect(globMock).toBeCalledWith('path2')
+        expect(warnMock).not.toBeCalled()
     })
 
-    function createArtifactGlobber(): FileArtifactGlobber {
+    it("warns when no glob results are produced", () => {
+        const globber = createArtifactGlobber([])
+
+        const expectedArtifacts =
+            globResults.map((path) => new Artifact(path, contentType))
+
+        expect(globber.globArtifactString('path', 'raw'))
+            .toEqual([])
+        expect(warnMock).toBeCalled()
+    })
+
+    function createArtifactGlobber(results: string[] = globResults): FileArtifactGlobber {
         const MockGlobber = jest.fn<Globber, any>(() => {
             return {
-                glob: () => globResults
+                glob: globMock
             }
         })
+        globMock.mockReturnValue(results)
         return new FileArtifactGlobber(new MockGlobber())
     }
 })