test: for post processor

test/test-post-processor.js

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+import path from 'path';
+import test from 'ava';
+import processor from '../src/post-processor';
+
+test('post processor should return function', t => {
+	t.true(typeof processor === 'function');
+});
+
+test('post processor without arguments should return Error', t => {
+	const error = t.throws(() => {
+		processor();
+	}, TypeError);
+
+	t.is(error.message, 'post-processor did not receive any arguments.');
+});
+
+test('post processor without processor should return Error', t => {
+	const tree = [];
+
+	const error = t.throws(() => {
+		processor(tree);
+	}, TypeError);
+
+	t.is(error.message, 'post-processor could not determine the process name.');
+});
+
+test('post processor should return posthtml', t => {
+	const tree = [];
+	const res = () => {};
+	tree.processor = {name: 'posthtml', plugins: []};
+
+	t.deepEqual(processor(tree, res), {name: 'posthtml', plugins: []})
+});
+
+test('post processor should return postcss', t => {
+	const tree = [];
+	const res = {
+		processor: {
+			plugins: []
+		}
+	};
+
+	t.deepEqual(processor(tree, res), {name: 'postcss', plugins: []})
+});
+
+test('post processor should return reshape', t => {
+	const tree = [];
+	const res = {
+		processor: {
+			name: 'reshape'
+		},
+		plugins: []
+	};
+
+	t.deepEqual(processor(tree, res), {name: 'reshape', plugins: undefined})
+});
+
+// test('post processor call without arguments should return empty object', t => {
+// 	t.deepEqual(processor(), {});
+// });