Add GCP test and coverage targets

[AndrewAXue]

I forgot to add the tests for Cloud Monitoring exporter into tox.ini :/

[lzchen]

LGTM!

[c24t]

I'm seeing test failures still:

% pytest ext/opentelemetry-exporter-cloud-monitoring/tests/test_cloud_monitoring.py -k test_get_metric_descriptor

ext/opentelemetry-exporter-cloud-monitoring/tests/test_cloud_monitoring.py::TestCloudMonitoringMetricsExporter::test_get_metric_descriptor FAILED       [100%]

========================================================================== FAILURES ===========================================================================
________________________________________________ TestCloudMonitoringMetricsExporter.test_get_metric_descriptor ________________________________________________

self = <tests.test_cloud_monitoring.TestCloudMonitoringMetricsExporter testMethod=test_get_metric_descriptor>

    def test_get_metric_descriptor(self):
        client = mock.Mock()
        exporter = CloudMonitoringMetricsExporter(client=client)
        exporter.project_name = self.project_name

        self.assertIsNone(
>           exporter._get_metric_descriptor(
                MetricRecord(MockMetric(), (), UnsupportedAggregator())
            )
        )

ext/opentelemetry-exporter-cloud-monitoring/tests/test_cloud_monitoring.py:107:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <opentelemetry.exporter.cloud_monitoring.CloudMonitoringMetricsExporter object at 0x10b042310>
record = <opentelemetry.sdk.metrics.export.MetricRecord object at 0x109723d90>

    def _get_metric_descriptor(
        self, record: MetricRecord
    ) -> Optional[MetricDescriptor]:
        """ We can map Metric to MetricDescriptor using Metric.name or
        MetricDescriptor.type. We create the MetricDescriptor if it doesn't
        exist already and cache it. Note that recreating MetricDescriptors is
        a no-op if it already exists.

        :param record:
        :return:
        """
>       instrument = record.instrument
E       AttributeError: 'MetricRecord' object has no attribute 'instrument'

ext/opentelemetry-exporter-cloud-monitoring/src/opentelemetry/exporter/cloud_monitoring/__init__.py:70: AttributeError

Also a warning about using app default credentials, looks like some calls to GCP aren't getting mocked?

[AndrewAXue]

I'm seeing test failures still:

% pytest ext/opentelemetry-exporter-cloud-monitoring/tests/test_cloud_monitoring.py -k test_get_metric_descriptor

ext/opentelemetry-exporter-cloud-monitoring/tests/test_cloud_monitoring.py::TestCloudMonitoringMetricsExporter::test_get_metric_descriptor FAILED       [100%]

========================================================================== FAILURES ===========================================================================
________________________________________________ TestCloudMonitoringMetricsExporter.test_get_metric_descriptor ________________________________________________

self = <tests.test_cloud_monitoring.TestCloudMonitoringMetricsExporter testMethod=test_get_metric_descriptor>

    def test_get_metric_descriptor(self):
        client = mock.Mock()
        exporter = CloudMonitoringMetricsExporter(client=client)
        exporter.project_name = self.project_name

        self.assertIsNone(
>           exporter._get_metric_descriptor(
                MetricRecord(MockMetric(), (), UnsupportedAggregator())
            )
        )

ext/opentelemetry-exporter-cloud-monitoring/tests/test_cloud_monitoring.py:107:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <opentelemetry.exporter.cloud_monitoring.CloudMonitoringMetricsExporter object at 0x10b042310>
record = <opentelemetry.sdk.metrics.export.MetricRecord object at 0x109723d90>

    def _get_metric_descriptor(
        self, record: MetricRecord
    ) -> Optional[MetricDescriptor]:
        """ We can map Metric to MetricDescriptor using Metric.name or
        MetricDescriptor.type. We create the MetricDescriptor if it doesn't
        exist already and cache it. Note that recreating MetricDescriptors is
        a no-op if it already exists.

        :param record:
        :return:
        """
>       instrument = record.instrument
E       AttributeError: 'MetricRecord' object has no attribute 'instrument'

ext/opentelemetry-exporter-cloud-monitoring/src/opentelemetry/exporter/cloud_monitoring/__init__.py:70: AttributeError

Also a warning about using app default credentials, looks like some calls to GCP aren't getting mocked?

The calls to GCP were getting mocked, but theres another thing we do
_, self.project_id = google.auth.default()
which is what prints that message. I've removed this call.

[toumorokoshi]

@c24t want to give a quick final pass and we'll merge?

[c24t]

Looks good, thanks @AndrewAXue!