Add tests for selectors hasEditorUndo & hasEditorRedo

[MAILPOET-3085]

tests/javascript/form_editor/store/selectors.spec.js

@@ -59,4 +59,68 @@ describe('Selectors', () => {
       expect(result).to.equal('Hello 2');
     });
   });
+
+  describe('hasEditorUndo', () => {
+    it('Should return false for empty history', () => {
+      const state = {
+        editorHistory: [],
+        editorHistoryOffset: 0,
+      };
+      expect(selectors.hasEditorUndo(state)).to.equal(false);
+    });
+
+    it('Should return true for one record in history', () => {
+      const state = {
+        editorHistory: [
+          { data: 'some data' },
+        ],
+        editorHistoryOffset: 0,
+      };
+      expect(selectors.hasEditorUndo(state)).to.equal(true);
+    });
+
+    it('Should return false for two records in history on offset one', () => {
+      const state = {
+        editorHistory: [
+          { data: 'some data 1' },
+          { data: 'some data 2' },
+        ],
+        editorHistoryOffset: 1,
+      };
+      expect(selectors.hasEditorUndo(state)).to.equal(false);
+    });
+
+    it('Should return true for three records in history on offset one', () => {
+      const state = {
+        editorHistory: [
+          { data: 'some data 1' },
+          { data: 'some data 2' },
+          { data: 'some data 3' },
+        ],
+        editorHistoryOffset: 1,
+      };
+      expect(selectors.hasEditorUndo(state)).to.equal(true);
+    });
+  });
+
+  describe('hasEditorRedo', () => {
+    it('Should return false for empty history', () => {
+      const state = {
+        editorHistory: [],
+        editorHistoryOffset: 0,
+      };
+      expect(selectors.hasEditorRedo(state)).to.equal(false);
+    });
+
+    it('Should return true for two records in history on offset one', () => {
+      const state = {
+        editorHistory: [
+          { data: 'some data 1' },
+          { data: 'some data 2' },
+        ],
+        editorHistoryOffset: 1,
+      };
+      expect(selectors.hasEditorRedo(state)).to.equal(true);
+    });
+  });
 });