Write Some Tests (JavaScript)

The easiest way to see Jinaga working is to write some tests. For that, you will need a test runner. We like Jest.

npm i -D jest

Open up your package.json file and modify your test script.

"scripts": {
    "test": "jest"
}

Then you can run tests using npm test. When you try that now, you will get an error. No tests were found! So write one.

Create a new folder called src. Then create a subfolder called shared. We put code here that can be used by either the client or the server. Inside of this folder, create a file called model.test.js:

const { JinagaTest } = require("jinaga");

var j;

beforeEach(() => {
    j = JinagaTest.create({});
})

test("Can create a fact", async () => {
    const firstFact = await j.fact({
        type: "MyApplication.FirstFact",
        identifier: "my_fact_id"
    });

    expect(firstFact.identifier).toBe("my_fact_id");
});

Every test is going to have the same structure. Inside of beforeEach, you create an instance of Jinaga using the JinagaTest factory. You can then add facts, run queries, and perform all of the other operations in a testing sandbox.

You can run your new test with npm test.