From ce1d97ad6539f7752072f27e05a683d5d2663d53 Mon Sep 17 00:00:00 2001
From: moklick <info@moritzklack.com>
Date: Wed, 31 Aug 2022 15:08:02 +0200
Subject: [PATCH] test(useNodesINitialized): add test

---
 .../hooks/useNodesInitialized.cy.tsx          | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 examples/nextjs/cypress/components/hooks/useNodesInitialized.cy.tsx

diff --git a/examples/nextjs/cypress/components/hooks/useNodesInitialized.cy.tsx b/examples/nextjs/cypress/components/hooks/useNodesInitialized.cy.tsx
new file mode 100644
index 00000000..0d7be072
--- /dev/null
+++ b/examples/nextjs/cypress/components/hooks/useNodesInitialized.cy.tsx
@@ -0,0 +1,68 @@
+import ReactFlow, { useNodesInitialized } from 'reactflow';
+
+import { nodes } from '../../fixtures/simpleflow';
+import ControlledFlow from '../../support/ControlledFlow';
+
+describe('useNodesInitialized.cy.tsx', () => {
+  it('returns false for no nodes', () => {
+    const initSpy = cy.spy().as('initSpy');
+
+    cy.mount(
+      <ReactFlow nodes={[]}>
+        <HookHelperComponent onChange={initSpy} />
+      </ReactFlow>
+    );
+
+    cy.get('@initSpy').should('to.be.calledOnce');
+    cy.get('@initSpy').should('have.been.calledWith', false);
+  });
+
+  it('returns false without onNodesChange', () => {
+    const initSpy = cy.spy().as('initSpy');
+
+    cy.mount(
+      <ReactFlow nodes={nodes}>
+        <HookHelperComponent onChange={initSpy} />
+      </ReactFlow>
+    );
+
+    cy.get('@initSpy').should('to.be.calledOnce');
+    cy.get('@initSpy').should('have.be.calledWith', false);
+  });
+
+  it('returns true for defaultNodes', () => {
+    const initSpy = cy.spy().as('initSpy');
+
+    cy.mount(
+      <ReactFlow defaultNodes={nodes}>
+        <HookHelperComponent onChange={initSpy} />
+      </ReactFlow>
+    );
+
+    cy.get('@initSpy').should('have.been.calledWith', false);
+    cy.get('@initSpy').should('have.been.calledWith', true);
+  });
+
+  it('returns true for nodes + onNodesChange', () => {
+    const initSpy = cy.spy().as('initSpy');
+
+    cy.mount(
+      <ControlledFlow initialNodes={nodes}>
+        <HookHelperComponent onChange={initSpy} />
+      </ControlledFlow>
+    );
+
+    cy.get('@initSpy').should('have.been.calledWith', false);
+    cy.get('@initSpy').should('have.been.calledWith', true);
+  });
+});
+
+// test specific helpers
+
+function HookHelperComponent({ onChange }: { onChange: (init: boolean) => void }) {
+  const initialized = useNodesInitialized();
+
+  onChange(initialized);
+
+  return null;
+}