feat: add basic tests checking the lib is not crashing

test.js

@@ -0,0 +1,18 @@
+const DottedMap = require('./index').default;
+
+// The tests can only be ran after the lib has been built.
+
+const map = new DottedMap({ height: 60, grid: 'diagonal' });
+
+map.addPin({
+  lat: 40.73061,
+  lng: -73.935242,
+  svgOptions: { color: '#d6ff79', radius: 0.4 },
+});
+map.getPin({ lat: 40.73061, lng: -73.935242 });
+map.getSVG({
+  radius: 0.22,
+  color: '#423B38',
+  shape: 'circle',
+  backgroundColor: '#020300',
+});