Added Jest test case for 'should be possible to apply a class to a vertex directly' use-case

src/diagrams/flowchart/parser/flow.spec.js

@@ -1685,6 +1685,22 @@ describe('when parsing ', function () {
     expect(classes['exClass'].styles[0]).toBe('background:#bbb')
     expect(classes['exClass'].styles[1]).toBe('border:1px solid red')
   })
+  it('should be possible to apply a class to a vertex directly', function () {
+    let statement = ''
+
+    statement = statement + 'graph TD;' + '\n'
+    statement = statement + 'classDef exClass background:#bbb,border:1px solid red;' + '\n'
+    statement = statement + 'a-->b[test].exClass;' + '\n'
+
+    const res = flow.parser.parse(statement)
+    const vertices = flow.parser.yy.getVertices()
+    const classes = flow.parser.yy.getClasses()
+
+    expect(classes['exClass'].styles.length).toBe(2)
+    expect(vertices['b'].classes[0]).toBe('exClass')
+    expect(classes['exClass'].styles[0]).toBe('background:#bbb')
+    expect(classes['exClass'].styles[1]).toBe('border:1px solid red')
+  })
   it('should be possible to apply a class to a comma separated list of vertices', function () {
     let statement = ''