Results callback test

package.json

@@ -65,6 +65,7 @@
         "ava": "^3.3.0",
         "changelog-updater": "^1.1.0",
         "nyc": "^15.0.0",
+        "p-defer": "^3.0.0",
         "sort-on": "^4.1.0",
         "typescript": "^3.7.5"
     },

src/bundle-orchastrator.test.ts

@@ -1,12 +1,13 @@
 import test, { ExecutionContext } from "ava";
-import { BundleOrchastrator } from "./bundle-orchastrator.js";
+import { BundleOrchastrator, ResultsCallback } from "./bundle-orchastrator.js";
 import intoStream from "into-stream";
 import getStream from "get-stream";
 import { Readable, Stream } from "stream";
 import Vinyl from "vinyl";
 import { resolve as resolvePath } from "path";
 import sortOn from "sort-on";
 import { mapAvaLoggerToStandard } from "./test-util.js";
+import pDefer from "p-defer";
 
 /**
  * Returns a pretend bundle for testing purposes.
@@ -70,6 +71,11 @@ interface IBundleBuilderFlags {
      * Don't include any script bundles.
      */
     noScriptBundles?: boolean;
+
+    /**
+     * Results callback to include.
+     */
+    resultsCallback?: ResultsCallback;
 }
 
 /**
@@ -107,18 +113,31 @@ function buildBundler(t: ExecutionContext, flags: IBundleBuilderFlags = {}) {
             Scripts: bundleFactoryJs,
             Styles: bundleFactoryCss,
         },
+        flags.resultsCallback
+            ? flags.resultsCallback
+            : undefined,
     );
 }
 
 test("Bundles with all dependencies met", async t => {
+    t.plan(3);
+
+    const resultsCallbackCompletion = pDefer();
+    const resultsCallback: ResultsCallback = function (results) {
+        // Results data is based on a clone of the actual Vinyl files, length is enough for now
+        t.is(results.scripts.size, 1);
+        t.is(results.styles.size, 1);
+        resultsCallbackCompletion.resolve();
+    };
+
     const result = await getStream.array(
         intoStream.object([
             new Vinyl({ path: resolvePath("./123/bar.js") }),
             new Vinyl({ path: resolvePath("./123/foo.css") }),
             new Vinyl({ path: resolvePath("./abc/foo.css") }),
             new Vinyl({ path: resolvePath("./abc/foo.js") }),
         ])
-            .pipe(buildBundler(t))
+            .pipe(buildBundler(t, { resultsCallback }))
     ) as Vinyl[];
 
     t.deepEqual(
@@ -137,6 +156,8 @@ test("Bundles with all dependencies met", async t => {
             'history'
         )
     );
+
+    await resultsCallbackCompletion.promise;
 });
 
 /**