run npm install to generate a package lock

node_modules/promise-make-counter/test/index.js

@@ -0,0 +1,52 @@
+
+/* IMPORT */
+
+import {describe} from 'fava';
+import makeCounterPromise from '../dist/index.js';
+
+/* MAIN */
+
+describe ( 'Promise Make Counter', it => {
+
+  it ( 'resolves without increments', async t => {
+
+    const {isPending} = makeCounterPromise ();
+
+    t.true ( isPending () );
+
+    await t.wait ( 0 );
+
+    t.false ( isPending () );
+
+  });
+
+  it ( 'resolves after equal increments and decrements', async t => {
+
+    const {isPending, increment, decrement} = makeCounterPromise ();
+
+    t.true ( isPending () );
+
+    increment ();
+    increment ();
+    increment ();
+
+    await t.wait ( 0 );
+
+    t.true ( isPending () );
+
+    decrement ();
+    decrement ();
+
+    await t.wait ( 0 );
+
+    t.true ( isPending () );
+
+    decrement ();
+
+    await t.wait ( 0 );
+
+    t.false ( isPending () );
+
+  });
+
+});