feat: Implement readRawConfig static API method

doc/programmatic-api.md

@@ -205,6 +205,10 @@ Rejects promise if critical error occurred.
 
 * `gemini.browserIds` – list of all browser identificators to use for tests.
 
+* `Gemini.readRawConfig` - reads configuration file for specified `filePath`
+and returns content as JS object. This method does not validate and analyze
+gemini configuration.
+
 ## Events
 
 `gemini` instance emits some events, which can be used by external scripts or

lib/config/index.js

@@ -55,6 +55,8 @@ Config.prototype.isCoverageEnabled = function() {
     return this.system.coverage.enabled;
 };
 
+Config.readRawConfig = readConfig;
+
 function readConfig(filePath) {
     var config = configReader.read(filePath),
         configDir = filePath ? path.dirname(filePath) : process.cwd();

lib/gemini.js

@@ -38,6 +38,10 @@ module.exports = class Gemini extends PassthroughEmitter {
         this._loadPlugins();
     }
 
+    static readRawConfig(filePath) {
+        return Config.readRawConfig(filePath);
+    }
+
     _run(stateProcessor, paths, options) {
         if (!options) {
             //if there are only two arguments, they are

test/unit/config/index.js

@@ -18,9 +18,21 @@ describe('config', function() {
         assert.calledWith(configReader.read, '/some/path');
     });
 
+    it('should have static API for reading of a configuration file', () => {
+        sandbox.stub(configReader, 'read')
+            .withArgs('/some/path')
+            .returns({foo: 'bar'});
+
+        assert.deepEqual(Config.readRawConfig('/some/path'), {
+            foo: 'bar',
+            system: {
+                projectRoot: '/some'
+            }
+        });
+    });
+
     describe('overrides', function() {
         beforeEach(function() {
-            /*jshint -W069*/
             this.configValue = '/from/config';
             this.envValue = '/from/env';
             this.cliValue = '/from/cli';
@@ -42,7 +54,6 @@ describe('config', function() {
         });
 
         afterEach(function() {
-            /*jshint -W069*/
             delete process.env['gemini_system_project_root'];
             process.argv = this.oldArgv;
         });

test/unit/gemini.js

@@ -336,4 +336,18 @@ describe('gemini', () => {
                 .then(() => assert.calledWith(console.warn, sinon.match('Unknown browsers id: b2')));
         });
     });
+
+    describe('readRawConfig', () => {
+        beforeEach(() => {
+            sandbox.stub(Config, 'readRawConfig');
+        });
+
+        it('should read configuration object from file by given path', () => {
+            Config.readRawConfig
+                .withArgs('some/file/path')
+                .returns({foo: 'bar'});
+
+            assert.deepEqual(Gemini.readRawConfig('some/file/path'), {foo: 'bar'});
+        });
+    });
 });