fix UT; review by qiw

Author: hechangqun

test/common/overlay/KnowledgeGraphSpec.js

@@ -405,8 +405,7 @@ describe('KnowledgeGraph', () => {
  graph.hideItem();
  graph.getHeight();
  graph.updateGraph(data);
- graph.clear();
- graph.destroy();
+ graph.refresh();
  } catch {}
  done();
  });
@@ -443,4 +442,24 @@ describe('KnowledgeGraph', () => {
  expect(result.length).toBe(1);
  done();
  });
+
+ it('destroy', (done) => {
+ var graph = new KnowledgeGraph({ nodeLabelMaxWidth: 100 });
+ const params = {
+ destroy: () => {
+ done();
+ }
+ };
+ graph.destroy(params);
+ });
+
+ it('clear', (done) => {
+ var graph = new KnowledgeGraph({ nodeLabelMaxWidth: 100 });
+ const params = {
+ clear: () => {
+ done();
+ }
+ };
+ graph.clear(params);
+ });
 });