mapping.test.ts

import { clearStore, test, assert, newMockEvent } from "matchstick-as/assembly/index";
import { ethereum } from "@graphprotocol/graph-ts";
import { NewCustomEntity } from "../generated/MyDataSource/Example";
import { handleNewCustomEntity } from "../mapping";

export function runTests(): void {
    test("Example", () => {
        // Initialise event (this can be generalised into a separate function)
        let newEntityEvent = newMockEvent(new NewCustomEntity()) as NewCustomEntity;
        newEntityEvent.parameters = [];
        let idParam = new ethereum.EventParam();
        idParam.value = ethereum.Value.fromI32(434);
        let nameParam = new ethereum.EventParam();
        nameParam.value = ethereum.Value.fromString("Don Draper");

        newEntityEvent.parameters.push(idParam);
        newEntityEvent.parameters.push(nameParam);

        // Call mappings
        handleNewCustomEntity(newEntityEvent);

        // Assert the state of the store
        assert.fieldEquals("CustomEntity", "434", "name", "Don Draper");

        // Clear the store before the next test (optional)
        clearStore();
    });

    test("Next test", () => {
        //...
    });
}