added test cases to check state diagram direction

packages/mermaid/src/diagrams/state/stateDiagram-v2.spec.js

@@ -1,4 +1,5 @@
 import stateDiagram, { parser } from './parser/stateDiagram.jison';
+import { DEFAULT_DIAGRAM_DIRECTION } from './stateCommon.js';
 import { StateDB } from './stateDb.js';
 
 describe('state diagram V2, ', function () {
@@ -412,5 +413,34 @@ describe('state diagram V2, ', function () {
       const rel_Active_Active = rels.find((rel) => rel.id1 === 'Active' && rel.id2 === 'Active');
       expect(rel_Active_Active.relationTitle).toEqual('LOG');
     });
+
+    it('should check default diagram direction', () => {
+      const diagram = `
+        stateDiagram
+          [*] --> Still
+          Still --> [*]
+        `;
+
+      parser.parse(diagram);
+
+      // checking default direction if no direction is specified
+      const defaultDir = stateDb.getDirection();
+      expect(defaultDir).toEqual(DEFAULT_DIAGRAM_DIRECTION);
+    });
+
+    it('retrieve the diagram direction correctly', () => {
+      const diagram = `
+        stateDiagram
+          direction LR
+          [*] --> Still
+          Still --> [*]
+        `;
+
+      parser.parse(diagram);
+
+      //retrieve the diagram direction
+      const currentDirection = stateDb.getDirection();
+      expect(currentDirection).toEqual('LR');
+    });
   });
 });