Add tests for the config (#495)

Co-authored-by: Itai Steinherz <itaisteinherz@gmail.com>

test/config.js

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+import path from 'path';
+import test from 'ava';
+import sinon from 'sinon';
+import proxyquire from 'proxyquire';
+
+const fixtureBasePath = path.resolve('test', 'fixtures', 'config');
+
+const getConfigsWhenGlobalBinaryIsUsed = async homedirStub => {
+	const pathsPkgDir = [path.resolve(fixtureBasePath, 'pkg-dir'),
+		path.resolve(fixtureBasePath, 'local1'),
+		path.resolve(fixtureBasePath, 'local2')];
+
+	const promises = [];
+	pathsPkgDir.forEach(pathPkgDir => {
+		promises.push(proxyquire('../source/config', {
+			'is-installed-globally': true,
+			'pkg-dir': async () => {
+				return pathPkgDir;
+			},
+			os: {
+				homedir: homedirStub
+			}
+		})());
+	});
+	return Promise.all(promises);
+};
+
+const getConfigsWhenLocalBinaryIsUsed = async pathPkgDir => {
+	const homedirs = [path.resolve(fixtureBasePath, 'homedir1'),
+		path.resolve(fixtureBasePath, 'homedir2')];
+
+	const promises = [];
+	homedirs.forEach(homedir => {
+		promises.push(proxyquire('../source/config', {
+			'is-installed-globally': false,
+			'pkg-dir': async () => {
+				return pathPkgDir;
+			},
+			os: {
+				homedir: () => {
+					return homedir;
+				}
+			}
+		})());
+	});
+	return Promise.all(promises);
+};
+
+test('returns config from home directory when global binary is used and `.np-config-json` exists in home directory', async t => {
+	const homedirStub = sinon.stub();
+	homedirStub.returns(path.resolve(fixtureBasePath, 'homedir1'));
+	const configs = await getConfigsWhenGlobalBinaryIsUsed(homedirStub);
+	configs.forEach(config => t.deepEqual(config, {source: 'homedir/.np-config.json'}));
+});
+
+test('returns config from home directory when global binary is used and `.np-config.js` exists in home directory', async t => {
+	const homedirStub = sinon.stub();
+	homedirStub.returns(path.resolve(fixtureBasePath, 'homedir2'));
+	const configs = await getConfigsWhenGlobalBinaryIsUsed(homedirStub);
+	configs.forEach(config => t.deepEqual(config, {source: 'homedir/.np-config.js'}));
+});
+
+test('returns config from package directory when local binary is used and `package.json` exists in package directory', async t => {
+	const configs = await getConfigsWhenLocalBinaryIsUsed(path.resolve(fixtureBasePath, 'pkg-dir'));
+	configs.forEach(config => t.deepEqual(config, {source: 'package.json'}));
+});
+
+test('returns config from package directory when local binary is used and `.np-config.json` exists in package directory', async t => {
+	const configs = await getConfigsWhenLocalBinaryIsUsed(path.resolve(fixtureBasePath, 'local1'));
+	configs.forEach(config => t.deepEqual(config, {source: 'packagedir/.np-config.json'}));
+});
+
+test('returns config from package directory when local binary is used and `.np-config.js` exists in package directory', async t => {
+	const configs = await getConfigsWhenLocalBinaryIsUsed(path.resolve(fixtureBasePath, 'local2'));
+	configs.forEach(config => t.deepEqual(config, {source: 'packagedir/.np-config.js'}));
+});

test/fixtures/config/homedir1/.np-config.json

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+{
+	"source": "homedir/.np-config.json"
+}

test/fixtures/config/homedir2/.np-config.js

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+module.exports = {
+	source: 'homedir/.np-config.js'
+};

test/fixtures/config/local1/.np-config.json

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+{
+	"source": "packagedir/.np-config.json"
+}

test/fixtures/config/local2/.np-config.js

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+module.exports = {
+	source: 'packagedir/.np-config.js'
+};

test/fixtures/config/pkg-dir/package.json

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+{
+	"name": "test-fixtures",
+	"np": {
+		"source": "package.json"
+	}
+}