❌ test: Write failing tests for API.

Author: make-github-pseudonymous-again

package.json

@@ -54,6 +54,7 @@
   },
   "dependencies": {},
   "devDependencies": {
+    "@aureooms/js-compare": "^1.4.8",
     "@babel/cli": "7.13.10",
     "@babel/core": "7.13.10",
     "@babel/preset-env": "7.13.10",

test/src/api.js

@@ -1,5 +1,31 @@
 import test from 'ava';
 
-test('API', (t) => {
-	t.fail();
+import {increasing, decreasing} from '@aureooms/js-compare';
+import {sorted} from '../../src/index.js';
+
+// https://en.wikipedia.org/wiki/Topological_sorting
+const wikipediaGraph = [
+	[3, 8],
+	[3, 10],
+	[5, 11],
+	[7, 11],
+	[7, 8],
+	[8, 9],
+	[11, 2],
+	[11, 9],
+	[11, 10],
+];
+
+test('smallest-numbered available vertex first', (t) => {
+	const expected = [3, 5, 7, 8, 11, 2, 9, 10];
+	const edges = wikipediaGraph.slice();
+	const result = [...sorted(edges, increasing)];
+	t.deepEqual(result, expected);
+});
+
+test('largest-numbered available vertex first', (t) => {
+	const expected = [7, 5, 11, 3, 10, 8, 9, 2];
+	const edges = wikipediaGraph.slice();
+	const result = [...sorted(edges, decreasing)];
+	t.deepEqual(result, expected);
 });

yarn.lock

@@ -2,6 +2,11 @@
 # yarn lockfile v1
 
 
+"@aureooms/js-compare@^1.4.8":
+  version "1.4.8"
+  resolved "https://registry.yarnpkg.com/@aureooms/js-compare/-/js-compare-1.4.8.tgz#c6bff1091f4a2e211f449299572d9f195146fc59"
+  integrity sha512-Z26PU6OmuhS7ZJsELTKImmipF7J+KCOyN70wBhhVIhmqUhXY6C3JpJHAev6wNBkC4ThlQt3zO6p/OmBFIq76Qg==
+
 "@babel/[email protected]":
   version "7.13.10"
   resolved "https://registry.yarnpkg.com/@babel/cli/-/cli-7.13.10.tgz#3a9254cbe806639c8ca4ebd49ebe54b4267b88c9"