Add more unit tests

src/BrailleBuffer.spec.js

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+import BrailleBuffer from './BrailleBuffer.js';
+
+const termReset = '\x1B[39;49m';
+
+describe('BrailleBuffer', () => {
+  test('starts a frame with term reset characters', async () => {
+    const brailleBuffer = new BrailleBuffer(1, 1);
+    expect(brailleBuffer.frame().startsWith(termReset)).toBe(true);
+  });
+});

src/Renderer.spec.js

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+import fsPromises from 'fs/promises';
+import Renderer from './Renderer';
+import TileSource from './TileSource.js';
+
+const center = {
+  lat: 52.51298,
+  lon: 13.42012,
+};
+
+describe('Renderer', () => {
+  describe('with a HTTP source', () => {
+    test('does not crash when creating a Renderer', async () => {
+      const tileSource = new TileSource();
+      await tileSource.init('http://mapscii.me/');
+      const style = JSON.parse(await fsPromises.readFile('./styles/dark.json'));
+      const renderer = new Renderer(tileSource, style);
+      renderer.setSize(30, 30);
+      expect(await renderer.draw(center, 13)).toMatchSnapshot();
+    });
+  });
+});

src/Styler.spec.js

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+import fsPromises from 'fs/promises';
+import Styler from './Styler';
+
+describe('Styler', () => {
+  describe('getStyleFor', () => {
+    test('returns false for landuse_park, line', async () => {
+      const style = JSON.parse(await fsPromises.readFile('./styles/dark.json'));
+      const styler = new Styler(style);
+      expect(styler.getStyleFor('landuse_park', 'line')).toBe(false);
+    });
+  });
+});