diff --git a/plugin/storage/cassandra/dependencystore/storage_test.go b/plugin/storage/cassandra/dependencystore/storage_test.go
index af3f13f6f99..34520562360 100644
--- a/plugin/storage/cassandra/dependencystore/storage_test.go
+++ b/plugin/storage/cassandra/dependencystore/storage_test.go
@@ -59,14 +59,8 @@ func withDepStore(fn func(s *depStorageTest)) {
 	fn(s)
 }
 
-func TestNewDependencyStore(t *testing.T) {
-	withDepStore(func(s *depStorageTest) {
-		var reader dependencystore.Reader = s.storage // check API conformance
-		var writer dependencystore.Writer = s.storage // check API conformance
-		assert.NotNil(t, reader)
-		assert.NotNil(t, writer)
-	})
-}
+var _ dependencystore.Reader = &DependencyStore{} // check API conformance
+var _ dependencystore.Writer = &DependencyStore{} // check API conformance
 
 func TestDependencyStoreWrite(t *testing.T) {
 	withDepStore(func(s *depStorageTest) {
diff --git a/plugin/storage/cassandra/samplingstore/storage_test.go b/plugin/storage/cassandra/samplingstore/storage_test.go
index ad5b6587318..64332d76208 100644
--- a/plugin/storage/cassandra/samplingstore/storage_test.go
+++ b/plugin/storage/cassandra/samplingstore/storage_test.go
@@ -61,12 +61,7 @@ func withSamplingStore(fn func(r *samplingStoreTest)) {
 	fn(r)
 }
 
-func TestNewSamplingStore(t *testing.T) {
-	withSamplingStore(func(s *samplingStoreTest) {
-		var store samplingstore.Store = s.store // check API conformance
-		assert.NotNil(t, store)
-	})
-}
+var _ samplingstore.Store = &SamplingStore{} // check API conformance
 
 func TestInsertThroughput(t *testing.T) {
 	withSamplingStore(func(s *samplingStoreTest) {
diff --git a/plugin/storage/cassandra/spanstore/reader_test.go b/plugin/storage/cassandra/spanstore/reader_test.go
index 7267a7a74e7..df58c2fca9c 100644
--- a/plugin/storage/cassandra/spanstore/reader_test.go
+++ b/plugin/storage/cassandra/spanstore/reader_test.go
@@ -59,12 +59,7 @@ func withSpanReader(fn func(r *spanReaderTest)) {
 	fn(r)
 }
 
-func TestNewSpanReader(t *testing.T) {
-	withSpanReader(func(r *spanReaderTest) {
-		var reader spanstore.Reader = r.reader // check API conformance
-		assert.NotNil(t, reader)
-	})
-}
+var _ spanstore.Reader = &SpanReader{} // check API conformance
 
 func TestSpanReaderGetServices(t *testing.T) {
 	withSpanReader(func(r *spanReaderTest) {
diff --git a/plugin/storage/cassandra/spanstore/writer_test.go b/plugin/storage/cassandra/spanstore/writer_test.go
index 1307eb5fba7..d004ee88b94 100644
--- a/plugin/storage/cassandra/spanstore/writer_test.go
+++ b/plugin/storage/cassandra/spanstore/writer_test.go
@@ -57,12 +57,7 @@ func withSpanWriter(writeCacheTTL time.Duration, fn func(w *spanWriterTest)) {
 	fn(w)
 }
 
-func TestNewSpanWriter(t *testing.T) {
-	withSpanWriter(0, func(w *spanWriterTest) {
-		var writer spanstore.Writer = w.writer // check API conformance
-		assert.NotNil(t, writer)
-	})
-}
+var _ spanstore.Writer = &SpanWriter{} // check API conformance
 
 func TestSpanWriter(t *testing.T) {
 	testCases := []struct {
diff --git a/plugin/storage/es/dependencystore/storage_test.go b/plugin/storage/es/dependencystore/storage_test.go
index fc73441f88b..8a4d5be7015 100644
--- a/plugin/storage/es/dependencystore/storage_test.go
+++ b/plugin/storage/es/dependencystore/storage_test.go
@@ -57,14 +57,8 @@ func withDepStorage(fn func(r *depStorageTest)) {
 	fn(r)
 }
 
-func TestAPIConformance(t *testing.T) {
-	withDepStorage(func(r *depStorageTest) {
-		var reader dependencystore.Reader = r.storage // check API conformance
-		var writer dependencystore.Writer = r.storage // check API conformance
-		assert.NotNil(t, reader)
-		assert.NotNil(t, writer)
-	})
-}
+var _ dependencystore.Reader = &DependencyStore{} // check API conformance
+var _ dependencystore.Writer = &DependencyStore{} // check API conformance
 
 func TestWriteDependencies(t *testing.T) {
 	testCases := []struct {
diff --git a/plugin/storage/es/spanstore/reader_test.go b/plugin/storage/es/spanstore/reader_test.go
index b81ffd98e79..d59fcad5b45 100644
--- a/plugin/storage/es/spanstore/reader_test.go
+++ b/plugin/storage/es/spanstore/reader_test.go
@@ -30,9 +30,9 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
-	"github.com/uber/jaeger-lib/metrics"
 	"go.uber.org/zap"
 
+	"github.com/uber/jaeger-lib/metrics"
 	"github.com/uber/jaeger/model"
 	esJson "github.com/uber/jaeger/model/json"
 	"github.com/uber/jaeger/pkg/es/mocks"
@@ -100,19 +100,12 @@ func withSpanReader(fn func(r *spanReaderTest)) {
 	fn(r)
 }
 
-func TestAPIConformance(t *testing.T) {
-	client := &mocks.Client{}
-	logger, _ := testutils.NewLogger() // logBuffer unneeded
-	metricsFactory := metrics.NewLocalFactory(0)
-	var reader spanstore.Reader = NewSpanReader(client, logger, 0, metricsFactory) // check API conformance
-	assert.NotNil(t, reader)
-}
+var _ spanstore.Reader = &SpanReader{} // check API conformance
 
 func TestNewSpanReader(t *testing.T) {
-	withSpanReader(func(r *spanReaderTest) {
-		var reader spanstore.Reader = r.reader // check API conformance
-		assert.NotNil(t, reader)
-	})
+	client := &mocks.Client{}
+	reader := NewSpanReader(client, zap.NewNop(), 0, metrics.NullFactory)
+	assert.NotNil(t, reader)
 }
 
 func TestSpanReader_GetTrace(t *testing.T) {
diff --git a/plugin/storage/es/spanstore/writer_test.go b/plugin/storage/es/spanstore/writer_test.go
index 70b439b5e3d..293f316bb2b 100644
--- a/plugin/storage/es/spanstore/writer_test.go
+++ b/plugin/storage/es/spanstore/writer_test.go
@@ -60,12 +60,7 @@ func withSpanWriter(fn func(w *spanWriterTest)) {
 	fn(w)
 }
 
-func TestNewSpanWriter(t *testing.T) {
-	withSpanWriter(func(w *spanWriterTest) {
-		var writer spanstore.Writer = w.writer
-		assert.NotNil(t, writer)
-	})
-}
+var _ spanstore.Writer = &SpanWriter{} // check API conformance
 
 // This test behaves as a large test that checks WriteSpan's behavior as a whole.
 // Extra tests for individual functions are below.