Add test for location, add istanbul.yml

Author: clentfort

.gitignore

@@ -5,3 +5,4 @@ ENV
 .elasticbeanstalk/*
 !.elasticbeanstalk/*.cfg.yml
 !.elasticbeanstalk/*.global.yml
+coverage/

.istanbul.yml

@@ -0,0 +1,5 @@
+instrumentation:
+  excludes:
+    - src/parser/Errors.js
+    - parser/Errors.js
+

src/util/__tests__/location-test.js

@@ -0,0 +1,47 @@
+jest.disableAutomock();
+
+import { Position, SourceLocation } from '../location';
+
+describe('Position', () => {
+  const line = 10;
+  const column = 5;
+
+  it('creates a new instance with line and column set', () => {
+    const p = new Position(line, column);
+    expect(p instanceof Position).toBe(true);
+
+    expect(p.line).toBe(line);
+    expect(p.column).toBe(column);
+  });
+
+  it('clones the instance', () => {
+    const p = new Position(line, column);
+    const c = p.clone();
+
+    expect(p).toEqual(c);
+    expect(p).not.toBe(c);
+  });
+});
+
+describe('SourceLocation', () => {
+  const start = new Position(0, 0);
+  const end = new Position(10, 50);
+
+  it('creates a new instance with start and end set', () => {
+    const loc = new SourceLocation(start, end);
+    expect(loc instanceof SourceLocation).toBe(true);
+
+    expect(loc.start).toBe(start);
+    expect(loc.end).toBe(end);
+  });
+
+  it('clones the instance and the position', () => {
+    const loc = new SourceLocation(start, end);
+    const c = loc.clone();
+
+    expect(loc).toEqual(c);
+    expect(loc).not.toBe(c);
+    expect(c.start).not.toBe(start);
+    expect(c.end).not.toBe(end);
+  });
+});