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<div class="px-4 pb-16 w-full overflow-hidden prose">
<h1>Testing GoJS apps</h1>
<p>
The <a>Robot</a> extension is useful for pretending to interact with a Diagram without actually generating any keyboard or mouse or pointer events. See the
sample at <a href="../samples/Robot.html">Simulating Input with Robot</a>.
</p>
<p>
One convenient feature of the <a>Robot</a> class is that it uses document coordinates, so that changes in the viewport size or diagram content alignment,
scroll position, or zoom level will not affect the calls.
</p>
<h2 id="TestingwithJest">Testing with Jest</h2>
<p>Testing with Jest depends on installing: <code>jest</code>, <code>puppeteer</code>, and <code>jest-puppeteer</code>.</p>
<pre class="lang-js"><code>
// jest.config.js
module.exports = {
preset: "jest-puppeteer"
};</code></pre>
<pre class="lang-js"><code>
// An example Jest test script for testing the unmodified Minimal sample,
// which is available at https://gojs.net/latest/samples/minimal.html.
// Copyright 1998-2025 by Northwoods Software Corporation
describe("minimal", () => {
beforeAll(async () => {
await page.goto('https://gojs.net/latest/samples/minimal.html');
});
it('should show 4 nodes and 5 links', async () => {
expect(await page.$("#myDiagramDiv")).not.toBeNull();
expect(await page.waitForFunction(() => {
const myDiagram = document.getElementById("myDiagramDiv").goDiagram;
return myDiagram.nodes.count === 4 &&
myDiagram.links.count === 5;
})).toBeTruthy();
});
it('show that the Beta node is orange', async () => {
expect(await page.waitForFunction(() => {
const myDiagram = document.getElementById("myDiagramDiv").goDiagram;
const beta = myDiagram.findNodeForKey("Beta");
return beta !== null && beta.data.color === "orange";
})).toBeTruthy();
});
it('demonstrates deleting a node', async () => {
expect(await page.waitForFunction(() => {
const myDiagram = document.getElementById("myDiagramDiv").goDiagram;
const beta = myDiagram.findNodeForKey("Beta");
myDiagram.select(beta);
myDiagram.commandHandler.deleteSelection();
return true;
})).toBeTruthy();
expect(await page.waitForFunction(() => {
const myDiagram = document.getElementById("myDiagramDiv").goDiagram;
return myDiagram.nodes.count === 3 &&
myDiagram.links.count === 3 &&
myDiagram.findNodeForKey("Beta") === null;
})).toBeTruthy();
});
});</code></pre>
<h3 id="TestingwithJestInReact">Testing with Jest in React</h3>
<p>
In our
<a href="https://github.com/NorthwoodsSoftware/gojs-react-samples/tree/main/gojs-react-jest">GoJS React samples</a>, we have an example of using the
gojs-react component with Jest: <a href="https://github.com/NorthwoodsSoftware/gojs-react-samples/tree/main/gojs-react-jest">gojs-react-jest</a>.
</p>
<h2 id="TestingwithCypress">Testing with Cypress</h2>
<pre class="lang-js"><code>
// An example Cypress test script for testing the unmodified Minimal sample,
// which is available at https://gojs.net/latest/samples/minimal.html.
// Copyright 1998-2025 by Northwoods Software Corporation
describe("minimal", () => {
let myDiagram = null
let myRobot = null
beforeEach(() => {
// more likely you would be running the sample locally,
// say at http://localhost:5500/samples/minimal.html
cy.visit("https://gojs.net/latest/samples/minimal.html")
// make sure the HTMLDivElement exists holding the Diagram
cy.get("#myDiagramDiv")
// load extensions/Robot.js dynamically
cy.window().then(win => {
const scr = win.document.createElement("script");
scr.src = "https://cdn.jsdelivr.net/npm/create-gojs-kit/dist/extensions/Robot.js";
win.document.body.appendChild(scr);
})
// make sure it's loaded
cy.window().should("have.property", "Robot")
// save these references for each test, which simplifies each test code
cy.window().then(win => {
myDiagram = win.go.Diagram.fromDiv(win.document.getElementById("myDiagramDiv"));
myRobot = new win.Robot(myDiagram);
})
// wait for the Diagram to finish initializing; is there a better way?
cy.wait(1)
})
// A minimal test to make sure the Diagram got set up OK.
it("has nodes and links", () => {
cy.window().then(win => {
expect(myDiagram.nodes.count).to.equal(4)
expect(myDiagram.links.count).to.equal(5)
const delta = myDiagram.findNodeForKey("Delta");
expect(delta).to.not.equal(null)
expect(delta.elt(0).fill).to.equal("pink")
})
})
// A test that uses Robot to simulate input by producing InputEvents.
it("copies a node with Robot", () => {
cy.window().then(win => {
// Find the center of the Delta node in document coordinates.
const delta = myDiagram.findNodeForKey("Delta");
const loc = delta.actualBounds.center;
// Simulate a mouse drag to move the Delta node:
const options = { control: true, alt: true };
myRobot.mouseDown(loc.x, loc.y, 0, options);
myRobot.mouseMove(loc.x + 80, loc.y + 50, 50, options);
myRobot.mouseMove(loc.x + 20, loc.y + 100, 100, options);
myRobot.mouseUp(loc.x + 20, loc.y + 100, 150, options);
// If successful, this will have made a copy of the "Delta" node below it.
// Check that the new node is at the drop point,
// and that it is a copy, different from the original node.
const newloc = new win.go.Point(loc.x + 20, loc.y + 100);
const newnode = myDiagram.findPartAt(newloc);
expect(newnode).to.not.equal(delta)
expect(newnode.key).to.equal("Delta2")
expect(newnode.isSelected).to.equal(true)
})
})
})</code></pre>
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