Add specs

Add some basic specs ensuring the linter is working.

Fixes #37.

spec/.eslintrc.js

@@ -0,0 +1,6 @@
+module.exports = {
+  env: {
+    jasmine: true,
+    atomtest: true
+  }
+};

spec/linter-puppet-lint-spec.js

@@ -0,0 +1,51 @@
+'use babel';
+
+import * as path from 'path';
+
+const cleanPath = path.join(__dirname, 'fixtures', 'test_clean.pp');
+const errorsPath = path.join(__dirname, 'fixtures', 'test_errors.pp');
+
+describe('The puppet-lint provider for Linter', () => {
+  const lint = require(path.join('..', 'lib', 'main.js')).provideLinter().lint;
+
+  beforeEach(() => {
+    atom.workspace.destroyActivePaneItem();
+
+    waitsForPromise(() =>
+      Promise.all([
+        atom.packages.activatePackage('linter-puppet-lint'),
+        atom.packages.activatePackage('language-puppet'),
+      ])
+    );
+  });
+
+  it('finds nothing wrong with a valid file', () => {
+    waitsForPromise(() =>
+      atom.workspace.open(cleanPath).then(editor => lint(editor)).then((messages) => {
+        expect(messages.length).toBe(0);
+      })
+    );
+  });
+
+  it('handles messages from puppet-lint', () => {
+    waitsForPromise(() =>
+      atom.workspace.open(errorsPath).then(editor => lint(editor)).then((messages) => {
+        expect(messages.length).toBe(2);
+
+        expect(messages[0].type).toBe('error');
+        expect(messages[0].severity).toBe('error');
+        expect(messages[0].html).not.toBeDefined();
+        expect(messages[0].text).toBe('does_not::exist not in autoload module layout');
+        expect(messages[0].filePath).toBe(errorsPath);
+        expect(messages[0].range).toEqual([[0, 6], [0, 14]]);
+
+        expect(messages[1].type).toBe('warning');
+        expect(messages[1].severity).toBe('warning');
+        expect(messages[1].html).not.toBeDefined();
+        expect(messages[1].text).toBe('class not documented');
+        expect(messages[1].filePath).toBe(errorsPath);
+        expect(messages[1].range).toEqual([[0, 0], [0, 5]]);
+      })
+    );
+  });
+});