Use dot reporter under Windows since spec doesn't handle ANSI color characters...

Use dot reporter under Windows since spec doesn't handle ANSI color characters due to the fact that tests are executed as an electron app

test/electron/index.js

@@ -17,7 +17,7 @@ const optimist = require('optimist')
 	.describe('build', 'run with build output (out-build)').boolean('build')
 	.describe('coverage', 'generate coverage report').boolean('coverage')
 	.describe('debug', 'open dev tools, keep window open, reuse app data').string('debug')
-	.describe('reporter', 'the mocha reporter').string('reporter').default('reporter', 'spec')
+	.describe('reporter', 'the mocha reporter').string('reporter').default('reporter', process.platform === 'win32' ? 'dot' : 'spec')
 	.describe('help', 'show the help').alias('help', 'h');
 
 const argv = optimist.argv;
@@ -113,7 +113,7 @@ app.on('ready', () => {
 		Reporter = require(reporterPath);
 	} catch (err) {
 		console.warn(`could not load reporter: ${argv.reporter}`);
-		Reporter = mocha.reporters.Spec;
+		Reporter = process.platform === 'win32' ? mocha.reporters.Dot : mocha.reporters.Spec;
 	}
 
 	const runner = new IPCRunner();