Add test for glob patterns

Author: malstoun

test/fixtures/glob/a.css

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+.a {
+  color: red;
+}

test/fixtures/glob/b.css

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+.b {
+  color: blue;
+}

test/fixtures/glob/s.css

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+.a {
+  color: red
+}

test/glob.js

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+import test from 'ava'
+import path from 'path'
+
+import cli from './helpers/cli.js'
+import tmp from './helpers/tmp.js'
+import read from './helpers/read.js'
+
+test('works with glob patterns', async t => {
+  const output = tmp()
+
+  const { error, stderr } = await cli([
+    'test/fixtures/glob/*.css',
+    '-d',
+    output,
+    '--no-map'
+  ])
+
+  t.ifError(error, stderr)
+
+  t.is(
+    await read(path.join(output, 'a.css')),
+    await read('test/fixtures/glob/a.css')
+  )
+  t.is(
+    await read(path.join(output, 'b.css')),
+    await read('test/fixtures/glob/b.css')
+  )
+  t.is(
+    await read(path.join(output, 's.css')),
+    await read('test/fixtures/glob/s.css')
+  )
+})