Laravel REST API Testing in phpunit

i test my my endpoints with the json function ( i believe there is a POST and GET method as well, but i need to pass in data and headers)

public function test_endpoint() {
        $result = $this->json('POST', '/api', ['key' => 'data'], ['Header' => "Value"]);
}

i have unit and feature tests as well, but i use this for testing graphQL endpoint.

So in my example void means that our method does not returning anything. postJson means we expect JSON response, either we can do just $this->post()

You can make calls like this

public function test_create_order() : void
    {
        $response = $this->postJson('/make-order',[
            'foo' => 'bar',
            'baz' => 'bat'
        ]);

        // To make sure it is returning 201 created status code, or other code e.g. (200 OK)
        $response->assertStatus(201);

        // To make sure it is in your desired structure 
        $response->assertJsonStructure([
                'id',
                'foo',
                'baz',
        ]);
 
        // Check if response contains exactly that value, what we inserted
        $this->assertEquals('bar', $response->json('data.foo'));

        // Check that in the database created that record,
        // param 1 is table name, param 2 is criteria to find that record
        // e.g. ['id' => 1]
        $this->assertDatabaseHas('orders', [
            'foo' => 'bar'
        ]);
        // Also there is other method assertDatabaseMissing, that works like above
        // just in reverse logic, it is checking that there is no record with that criteria
       
    }