func testEventListener()

in glean-core/ios/GleanTests/Metrics/EventMetricTests.swift [349:405]
45 lines of code
1 McCabe index (conditional complexity)

    func testEventListener() {
        let event1 = EventMetricType<SomeExtras>(CommonMetricData(
            category: "telemetry",
            name: "test_event1",
            sendInPings: ["events"],
            lifetime: .ping,
            disabled: false
        ), ["some_extra"])

        let event2 = EventMetricType<SomeExtras>(CommonMetricData(
            category: "telemetry",
            name: "test_event2",
            sendInPings: ["events"],
            lifetime: .ping,
            disabled: false
        ), ["some_extra"])

        let event3 = EventMetricType<SomeExtras>(CommonMetricData(
            category: "telemetry",
            name: "test_event3",
            sendInPings: ["events"],
            lifetime: .ping,
            disabled: false
        ), ["some_extra"])

        Glean.shared.resetGlean(clearStores: false)

        let listener = TestEventListener()

        // Register the listener
        Glean.shared.registerEventListener(tag: listener.listenerTag, listener: listener)

        // Ensure events are being reported via the callback
        event1.record(SomeExtras(someExtra: "uno"))
        XCTAssertEqual(1, listener.count)
        XCTAssertEqual("telemetry.test_event1", listener.lastSeenId)
        event2.record(SomeExtras(someExtra: "dos"))
        XCTAssertEqual(2, listener.count)
        XCTAssertEqual("telemetry.test_event2", listener.lastSeenId)
        event3.record(SomeExtras(someExtra: "tres"))
        XCTAssertEqual(3, listener.count)
        XCTAssertEqual("telemetry.test_event3", listener.lastSeenId)

        // Unregister the listener
        Glean.shared.unregisterEventListener(tag: listener.listenerTag)

        // Ensure events are no longer reported via the callback
        event1.record(SomeExtras(someExtra: "uno"))
        XCTAssertEqual(3, listener.count)
        XCTAssertEqual("telemetry.test_event3", listener.lastSeenId)
        event2.record(SomeExtras(someExtra: "dos"))
        XCTAssertEqual(3, listener.count)
        XCTAssertEqual("telemetry.test_event3", listener.lastSeenId)
        event3.record(SomeExtras(someExtra: "tres"))
        XCTAssertEqual(3, listener.count)
        XCTAssertEqual("telemetry.test_event3", listener.lastSeenId)
    }