Move testing to ava

Fixes #181.

test/enabled.js

@@ -0,0 +1,43 @@
+import test from 'ava';
+import resolveFrom from 'resolve-from';
+
+// Spoof supports-color
+require.cache[resolveFrom(__dirname, 'supports-color')] = {
+	exports: {
+		level: 3,
+		hasBasic: true,
+		has256: true,
+		has16m: true
+	}
+};
+
+const m = require('..');
+
+test('don\'t output colors when manually disabled', t => {
+	m.enabled = false;
+	t.is(m.red('foo'), 'foo');
+	m.enabled = true;
+});
+
+test('enable/disable colors based on overall chalk enabled property, not individual instances', t => {
+	m.enabled = false;
+	const red = m.red;
+	t.false(red.enabled);
+	m.enabled = true;
+	t.true(red.enabled);
+	m.enabled = true;
+});
+
+test('propagate enable/disable changes from child colors', t => {
+	m.enabled = false;
+	const red = m.red;
+	t.false(red.enabled);
+	t.false(m.enabled);
+	red.enabled = true;
+	t.true(red.enabled);
+	t.true(m.enabled);
+	m.enabled = false;
+	t.false(red.enabled);
+	t.false(m.enabled);
+	m.enabled = true;
+});