refactor for cross platform use

__tests__/github.test.ts

@@ -0,0 +1,30 @@
+//import * as assert from "assert";
+//const assert = require('assert');
+import * as assert from 'assert';
+import { mimeOrDefault, asset } from '../src/github';
+
+describe('github', () => {
+	describe('mimeOrDefault', () => {
+		it('returns a specific mime for common path', async () => {
+			assert.equal(mimeOrDefault('foo.tar.gz'), 'application/gzip')
+		});
+		it('returns default mime for uncommon path', async () => {
+			assert.equal(mimeOrDefault('foo.uncommon'), 'application/octet-stream')
+		});
+	});
+
+	describe('asset', () => {
+		it('derives asset info from a path', async () => {
+			const {
+				name,
+				mime,
+				size,
+				file
+			} = asset('tests/data/foo/bar.txt');
+			assert.equal(name, 'bar.txt');
+			assert.equal(mime, 'text/plain');
+			assert.equal(size, 10);
+			assert.equal(file.toString(), 'release me')
+		});
+	})
+});

__tests__/util.test.ts

@@ -0,0 +1,19 @@
+import { isTag, paths } from '../src/util';
+import * as assert from 'assert';
+
+describe('util', () => {
+  describe('isTag', () => {
+    it('returns true for tags', async () => {
+      assert.equal(isTag('refs/tags/foo'), true)
+    });
+    it ('returns false for other kinds of refs', async () => {
+      assert.equal(isTag('refs/heads/master'), false)
+    })
+  })
+
+  describe('paths', () => {
+    it('resolves files given a set of paths', async () => {
+      assert.deepStrictEqual(paths(["tests/data/**/*"]), ['tests/data/foo/bar.txt'])
+    });
+  })
+});