Remove MomentJS dependency from Gantt Jest test cases

To reduce the dependencies of the Jest test cases, the moment dates in
both Jest test files are replaced with native javascript. Also the
physical file gantt.spec.js is moved to be in the same folder as
gantt.js

src/diagrams/gantt/parser/gantt.spec.js

@@ -0,0 +1,85 @@
+/* eslint-env jasmine */
+/* eslint-disable no-eval */
+import { parser } from './gantt'
+import ganttDb from '../ganttDb'
+
+describe('when parsing a gantt diagram it', function () {
+  beforeEach(function () {
+    parser.yy = ganttDb
+    parser.yy.clear()
+  })
+
+  it('should handle a dateFormat definition', function () {
+    const str = 'gantt\ndateFormat yyyy-mm-dd'
+
+    parser.parse(str)
+  })
+  it('should handle a title definition', function () {
+    const str = 'gantt\ndateFormat yyyy-mm-dd\ntitle Adding gantt diagram functionality to mermaid'
+
+    parser.parse(str)
+  })
+  it('should handle a section definition', function () {
+    const str = 'gantt\n' +
+      'dateFormat yyyy-mm-dd\n' +
+      'title Adding gantt diagram functionality to mermaid\n' +
+      'section Documentation'
+
+    parser.parse(str)
+  })
+  /**
+   * Beslutsflöde inligt nedan. Obs bla bla bla
+   * ```
+   * graph TD
+   * A[Hard pledge] -- text on link -->B(Round edge)
+   * B --> C{to do or not to do}
+   * C -->|Too| D[Result one]
+   * C -->|Doo| E[Result two]
+   ```
+   * params bapa - a unique bapap
+   */
+  it('should handle a task definition', function () {
+    const str = 'gantt\n' +
+      'dateFormat YYYY-MM-DD\n' +
+      'title Adding gantt diagram functionality to mermaid\n' +
+      'section Documentation\n' +
+      'Design jison grammar:des1, 2014-01-01, 2014-01-04'
+
+    parser.parse(str)
+
+    const tasks = parser.yy.getTasks()
+
+    expect(tasks[0].startTime).toEqual(new Date(2014, 0, 1))
+    expect(tasks[0].endTime).toEqual(new Date(2014, 0, 4))
+    expect(tasks[0].id).toEqual('des1')
+    expect(tasks[0].task).toEqual('Design jison grammar')
+  })
+  it.each`
+    tags                     | milestone | done     | crit     | active
+    ${'milestone'}           | ${true}   | ${false} | ${false} | ${false}
+    ${'done'}                | ${false}  | ${true}  | ${false} | ${false}
+    ${'crit'}                | ${false}  | ${false} | ${true}  | ${false}
+    ${'active'}              | ${false}  | ${false} | ${false} | ${true}
+    ${'crit,milestone,done'} | ${true}   | ${true}  | ${true}  | ${false}
+    `('should handle a task with tags $tags', ({ tags, milestone, done, crit, active }) => {
+  const str = 'gantt\n' +
+        'dateFormat YYYY-MM-DD\n' +
+        'title Adding gantt diagram functionality to mermaid\n' +
+        'section Documentation\n' +
+        'test task:' + tags + ', 2014-01-01, 2014-01-04'
+
+  const allowedTags = ['active', 'done', 'crit', 'milestone']
+
+  parser.parse(str)
+
+  const tasks = parser.yy.getTasks()
+
+  allowedTags.forEach(function (t) {
+    if (eval(t)) {
+      expect(tasks[0][t]).toBeTruthy()
+    } else {
+      expect(tasks[0][t]).toBeFalsy()
+    }
+  })
+})
+})