[chore][receiver/googlecloudspannerreceiver] Enable goleak checks (op…

…en-telemetry#32307)

This is a test only change that enables `goleak` checks on some of the
internal packages of the Google Cloud Spanner receiver to help ensure no
goroutines are leaking. Some tests were missing shutdown calls so those
have been added.

**Link to tracking Issue:** open-telemetry#30438

All existing tests are passing, as well as added `goleak` checks.

receiver/googlecloudspannerreceiver/internal/filter/package_test.go

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package filter
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}

receiver/googlecloudspannerreceiver/internal/filterfactory/filterbuilder_test.go

@@ -96,6 +96,7 @@ func TestFilterBuilder_BuildFilterByMetricPositiveTotalLimit(t *testing.T) {
 						assert.Equal(t, expectedLimit, f.TotalLimit())
 						assert.Equal(t, expectedLimit, f.LimitByTimestamp())
 					}
+					assert.NoError(t, f.Shutdown())
 				}
 			}
 		})
@@ -147,6 +148,7 @@ func TestFilterBuilder_HandleLowCardinalityGroups(t *testing.T) {
 					assert.Equal(t, expectedLimit, f.TotalLimit())
 					assert.Equal(t, expectedLimit, f.LimitByTimestamp())
 					assert.Equal(t, testCase.expectedRemainingTotalLimit, remainingTotalLimit)
+					assert.NoError(t, f.Shutdown())
 				}
 			}
 		})
@@ -200,6 +202,7 @@ func TestFilterBuilder_HandleHighCardinalityGroups(t *testing.T) {
 					assert.Equal(t, testCase.expectedHighCardinalityTotalLimit, f.TotalLimit())
 					assert.Equal(t, testCase.expectedHighCardinalityLimitByTimestamp, f.LimitByTimestamp())
 					assert.Equal(t, testCase.expectedRemainingTotalLimit, remainingTotalLimit)
+					assert.NoError(t, f.Shutdown())
 				}
 			}
 		})
@@ -234,6 +237,7 @@ func TestFilterBuilder_TestConstructFiltersForGroups(t *testing.T) {
 			assert.Equal(t, totalLimitPerMetric, f.TotalLimit())
 			assert.Equal(t, limitPerMetricByTimestamp, f.LimitByTimestamp())
 			assert.Equal(t, expectedRemainingTotalLimit, result)
+			assert.NoError(t, f.Shutdown())
 		}
 	}
 }

receiver/googlecloudspannerreceiver/internal/filterfactory/itemfilterfactory_test.go

@@ -47,6 +47,7 @@ func TestNewItemFilterResolver(t *testing.T) {
 				require.Nil(t, factory)
 			} else {
 				require.NoError(t, err)
+				require.NoError(t, factory.Shutdown())
 			}
 		})
 	}

receiver/googlecloudspannerreceiver/internal/filterfactory/package_test.go

@@ -0,0 +1,15 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package filterfactory
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+// See https://github.com/census-instrumentation/opencensus-go/issues/1191 for more information on ignore.
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m, goleak.IgnoreTopFunction("go.opencensus.io/stats/view.(*worker).start"))
+}

receiver/googlecloudspannerreceiver/internal/statsreader/package_test.go

@@ -0,0 +1,15 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package statsreader
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+// See https://github.com/census-instrumentation/opencensus-go/issues/1191 for more information on ignore.
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m, goleak.IgnoreTopFunction("go.opencensus.io/stats/view.(*worker).start"))
+}