Move testing to ava

Fixes #181.

test/constructor.js

@@ -0,0 +1,30 @@
+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('create an isolated context where colors can be disabled (by level)', t => {
+	const ctx = new m.constructor({level: 0, enabled: true});
+	t.is(ctx.red('foo'), 'foo');
+	t.is(m.red('foo'), '\u001B[31mfoo\u001B[39m');
+	ctx.level = 2;
+	t.is(ctx.red('foo'), '\u001B[31mfoo\u001B[39m');
+});
+
+test('create an isolated context where colors can be disabled (by enabled flag)', t => {
+	const ctx = new m.constructor({enabled: false});
+	t.is(ctx.red('foo'), 'foo');
+	t.is(m.red('foo'), '\u001B[31mfoo\u001B[39m');
+	ctx.enabled = true;
+	t.is(ctx.red('foo'), '\u001B[31mfoo\u001B[39m');
+});