Fixes #1 Allow for multiple artifacts

__tests__/Artifact.test.ts

@@ -0,0 +1,38 @@
+import { Artifact } from "../src/Artifact";
+
+const fileContents = Buffer.from('artful facts', 'utf-8')
+const contentLength = 42
+
+jest.mock('fs', () => {
+    return {
+        readFileSync: () => fileContents,
+        statSync: () => { return { size: contentLength } }
+    };
+})
+
+describe("Artifact", () => {
+    it('defaults contentType to raw', () => {
+        const artifact = new Artifact('')
+        expect(artifact.contentType).toBe('raw')
+    })
+
+    it('generates name from path', () => {
+        const artifact = new Artifact('some/artifact')
+        expect(artifact.name).toBe('artifact')
+    })
+
+    it('provides contentLength', () => {
+        const artifact = new Artifact('some/artifact')
+        expect(artifact.contentLength).toBe(contentLength)
+    })
+
+    it('provides path', () => {
+        const artifact = new Artifact('some/artifact')
+        expect(artifact.path).toBe('some/artifact')
+    })
+
+    it('reads artifact', () => {
+        const artifact = new Artifact('some/artifact')
+        expect(artifact.readFile()).toBe(fileContents)
+    })
+})