if len(CloudPlatform) > 0 {
		switch strings.ToLower(CloudPlatform) {
		case "aws":
			return NewAWS(ipv6)
		case "azure":
			return NewAzure()
		case "gcp":
			return NewGCP()
		case "none":
			return &Unknown{}
		}
	}
	// Discover the platform if user has not specified.
	return DiscoverWithTimeout(defaultTimeout, ipv6)
}

				tt.numericProjectIDFn, tt.locationFn, tt.clusterNameFn, tt.instanceNameFn, tt.instanceIDFn, tt.instanceTemplateFn, tt.instanceCreatedByFn
			e := NewGCP()
			got := e.Metadata()
			assert.Equal(t, got, tt.want)
		})
	}
}

func TestMetadataCache(t *testing.T) {
	tests := []struct {
		name                string
		shouldFill          shouldFillFn

		// Assume this is running on GCP if GCP project env variable is set.
		return true
	}
	return metadata.OnGCE()
}

// NewGCP returns a platform environment customized for Google Cloud Platform.
// Metadata returned by the GCP Environment is taken from the GCE metadata
// service.
func NewGCP() Environment {
	return &gcpEnv{
		fillMetadata: lazy.New(func() (bool, error) {
			return shouldFillMetadata(), nil
		}),
	}