Cleared sankey renderer

cypress/integration/rendering/sankey.spec.js

@@ -0,0 +1,14 @@
+import { imgSnapshotTest, renderGraph } from '../../helpers/util.js';
+
+describe('Sankey Diagram', () => {
+  it('should render a simple sankey diagram', () => {
+    imgSnapshotTest(
+      `
+      sankey
+        a -> 30 -> b
+      `,
+      {}
+    );
+    cy.get('svg');
+  });
+});