test(ci_source): add initial test case for external ci source lookup

source/ci_source/_tests/_ci_sourse.test.js

@@ -1,7 +1,8 @@
 // @flow
 
 import Fake from "../providers/Fake"
-import { getCISourceForEnv } from "../ci_source"
+import DummyCI from "./fixtures/dummy_ci"
+import { getCISourceForEnv, getCISourceForExternal } from "../ci_source"
 
 describe(".getCISourceForEnv", () => {
   test("returns undefined if nothing is found", () => {
@@ -14,3 +15,15 @@ describe(".getCISourceForEnv", () => {
     expect(ci).toBeInstanceOf(Fake)
   })
 })
+
+describe(".getCISourceForExternal", () => {
+  test("should resolve module relatively", () => {
+    const ci = getCISourceForExternal({ }, "./source/ci_source/_tests/fixtures/dummy_ci.js")
+    expect(ci).toBeInstanceOf(DummyCI)
+  })
+
+  test("should return undefined if module resolution fails", () => {
+    const ci = getCISourceForExternal({ }, "./dummy_ci.js")
+    expect(ci).toBeUndefined()
+  })
+})

source/ci_source/_tests/fixtures/dummy_ci.js

@@ -0,0 +1,13 @@
+// @flow
+"use strict"
+
+export default class DummyCI {
+  get name(): string { return "Dummy Testing CI" }
+
+  get isCI(): boolean { return false }
+  get isPR(): boolean { return true }
+
+  get pullRequestID(): string { return this.env.pr }
+  get repoSlug(): string { return this.env.repo }
+  get supportedPlatforms(): string[] { return ["github"] }
+}