diff --git a/core/capabilities/transmission/local_target_capability_test.go b/core/capabilities/transmission/local_target_capability_test.go
index a6b7b8303c5..8c0cfd80ce8 100644
--- a/core/capabilities/transmission/local_target_capability_test.go
+++ b/core/capabilities/transmission/local_target_capability_test.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/rand"
 	"testing"
+	"testing/synctest"
 	"time"
 
 	"github.com/stretchr/testify/assert"
@@ -108,7 +109,7 @@ func TestScheduledExecutionStrategy_LocalDON(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
+		synctestrun(t, tc.name, func(t *testing.T) {
 			startTime := time.Now()
 
 			m, err := values.NewMap(map[string]any{
@@ -191,3 +192,11 @@ func (m *mockCapability) RegisterToWorkflow(ctx context.Context, request capabil
 func (m *mockCapability) UnregisterFromWorkflow(ctx context.Context, request capabilities.UnregisterFromWorkflowRequest) error {
 	return nil
 }
+
+func synctestrun(t *testing.T, name string, f func(*testing.T)) {
+	t.Helper()
+	t.Run(name, func(t *testing.T) {
+		t.Helper()
+		synctest.Test(t, f)
+	})
+}
diff --git a/core/services/ocr2/plugins/promwrapper/plugin.go b/core/services/ocr2/plugins/promwrapper/plugin.go
index aa60ab88005..977e80ac230 100644
--- a/core/services/ocr2/plugins/promwrapper/plugin.go
+++ b/core/services/ocr2/plugins/promwrapper/plugin.go
@@ -16,7 +16,8 @@ import (
 	"github.com/smartcontractkit/libocr/offchainreporting2plus/types"
 )
 
-const (
+// var instead of const to make it overridable in tests
+var (
 	// defaultExpiration is the default expiration time for cache items.
 	defaultExpiration = 30 * time.Minute
 
diff --git a/core/services/ocr2/plugins/promwrapper/plugin_test.go b/core/services/ocr2/plugins/promwrapper/plugin_test.go
index 371c03e78df..fb08d78852d 100644
--- a/core/services/ocr2/plugins/promwrapper/plugin_test.go
+++ b/core/services/ocr2/plugins/promwrapper/plugin_test.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"math/big"
 	"testing"
+	"testing/synctest"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -13,7 +14,6 @@ import (
 
 	"github.com/smartcontractkit/libocr/offchainreporting2plus/types"
 
-	"github.com/smartcontractkit/chainlink/v2/core/internal/testutils"
 	"github.com/smartcontractkit/chainlink/v2/core/services/ocr2/plugins/promwrapper/mocks"
 )
 
@@ -78,155 +78,162 @@ func TestPlugin_MustInstantiate(t *testing.T) {
 }
 
 func TestPlugin_GetLatencies(t *testing.T) {
-	// Use arbitrary report timestamp and label values.
-	configDigest := common.BytesToHash(crypto.Keccak256([]byte("foobar")))
-	reportTimestamp := types.ReportTimestamp{
-		ConfigDigest: types.ConfigDigest(configDigest),
-		Epoch:        1,
-		Round:        1,
-	}
-	var assertCorrectLabelValues = func(labelValues []string) {
-		require.Equal(
-			t,
-			[]string{
-				"EVM",
-				"1",
+	synctest.Test(t, func(t *testing.T) {
+		{
+			// Use arbitrary report timestamp and label values.
+			configDigest := common.BytesToHash(crypto.Keccak256([]byte("foobar")))
+			reportTimestamp := types.ReportTimestamp{
+				ConfigDigest: types.ConfigDigest(configDigest),
+				Epoch:        1,
+				Round:        1,
+			}
+			var assertCorrectLabelValues = func(labelValues []string) {
+				require.Equal(
+					t,
+					[]string{
+						"EVM",
+						"1",
+						"test-plugin",
+						"0",
+						common.Bytes2Hex(configDigest[:]),
+					}, labelValues)
+			}
+
+			// Instantiate prometheus backend mock.
+			backend := mocks.NewPrometheusBackend(t)
+
+			// Assert intra-phase latencies.
+			backend.On("SetQueryDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				duration := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, duration, qDuration)
+				require.Less(t, duration, oDuration)
+			}).Return()
+			backend.On("SetObservationDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				duration := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, duration, oDuration)
+				require.Less(t, duration, rDuration)
+			}).Return()
+			backend.On("SetReportDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				duration := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, duration, rDuration)
+				require.Less(t, duration, aDuration)
+			}).Return()
+			backend.On("SetShouldAcceptFinalizedReportDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				duration := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, duration, aDuration)
+				require.Less(t, duration, tDuration)
+			}).Return()
+			backend.On("SetShouldTransmitAcceptedReportDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				duration := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, duration, tDuration)
+				require.Less(t, duration, cDuration)
+			}).Return()
+
+			// Assert inter-phase latencies.
+			backend.On("SetQueryToObservationLatency", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				latency := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, latency, qToOLatency)
+				require.Less(t, latency, oToRLatency)
+			}).Return()
+			backend.On("SetObservationToReportLatency", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				latency := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, latency, oToRLatency)
+				require.Less(t, latency, rToALatency)
+			}).Return()
+			backend.On("SetReportToAcceptFinalizedReportLatency", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				latency := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, latency, rToALatency)
+				require.Less(t, latency, aToTLatency)
+			}).Return()
+			backend.On("SetAcceptFinalizedReportToTransmitAcceptedReportLatency", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				latency := time.Duration(args[1].(float64))
+				assertCorrectLabelValues(labelValues)
+				require.Equal(t, latency, aToTLatency)
+				require.Less(t, latency, cDuration)
+			}).Return()
+
+			// Assert close correctly reported.
+			backend.On("SetCloseDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
+				labelValues := args[0].([]string)
+				latency := time.Duration(args[1].(float64))
+				require.Equal(
+					t,
+					[]string{
+						"EVM",
+						"1",
+						"test-plugin",
+						"0",
+						common.Bytes2Hex(configDigest[:]),
+					}, labelValues)
+				require.Equal(t, latency, cDuration)
+				require.Less(t, latency, ceiling)
+			}).Return()
+
+			// Create promPlugin with mocked prometheus backend.
+			var reportingPlugin = &fakeReportingPlugin{}
+			// Zero defaultCleanupInterval to disable gc in "github.com/patrickmn/go-cache", since gc is not compatible
+			// with synctest. See https://github.com/patrickmn/go-cache/issues/185.
+			defaultCleanupInterval = 0
+			var promPlugin = New(
+				reportingPlugin,
 				"test-plugin",
-				"0",
-				common.Bytes2Hex(configDigest[:]),
-			}, labelValues)
-	}
-
-	// Instantiate prometheus backend mock.
-	backend := mocks.NewPrometheusBackend(t)
-
-	// Assert intra-phase latencies.
-	backend.On("SetQueryDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		duration := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, duration, qDuration)
-		require.Less(t, duration, oDuration)
-	}).Return()
-	backend.On("SetObservationDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		duration := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, duration, oDuration)
-		require.Less(t, duration, rDuration)
-	}).Return()
-	backend.On("SetReportDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		duration := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, duration, rDuration)
-		require.Less(t, duration, aDuration)
-	}).Return()
-	backend.On("SetShouldAcceptFinalizedReportDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		duration := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, duration, aDuration)
-		require.Less(t, duration, tDuration)
-	}).Return()
-	backend.On("SetShouldTransmitAcceptedReportDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		duration := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, duration, tDuration)
-		require.Less(t, duration, cDuration)
-	}).Return()
-
-	// Assert inter-phase latencies.
-	backend.On("SetQueryToObservationLatency", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		latency := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, latency, qToOLatency)
-		require.Less(t, latency, oToRLatency)
-	}).Return()
-	backend.On("SetObservationToReportLatency", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		latency := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, latency, oToRLatency)
-		require.Less(t, latency, rToALatency)
-	}).Return()
-	backend.On("SetReportToAcceptFinalizedReportLatency", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		latency := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, latency, rToALatency)
-		require.Less(t, latency, aToTLatency)
-	}).Return()
-	backend.On("SetAcceptFinalizedReportToTransmitAcceptedReportLatency", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		latency := time.Duration(args[1].(float64))
-		assertCorrectLabelValues(labelValues)
-		require.Greater(t, latency, aToTLatency)
-		require.Less(t, latency, cDuration)
-	}).Return()
-
-	// Assert close correctly reported.
-	backend.On("SetCloseDuration", mock.Anything, mock.Anything).Run(func(args mock.Arguments) {
-		labelValues := args[0].([]string)
-		latency := time.Duration(args[1].(float64))
-		require.Equal(
-			t,
-			[]string{
 				"EVM",
-				"1",
-				"test-plugin",
-				"0",
-				common.Bytes2Hex(configDigest[:]),
-			}, labelValues)
-		require.Greater(t, latency, cDuration)
-		require.Less(t, latency, ceiling)
-	}).Return()
-
-	// Create promPlugin with mocked prometheus backend.
-	var reportingPlugin = &fakeReportingPlugin{}
-	var promPlugin = New(
-		reportingPlugin,
-		"test-plugin",
-		"EVM",
-		big.NewInt(1),
-		types.ReportingPluginConfig{ConfigDigest: reportTimestamp.ConfigDigest},
-		backend,
-	).(*promPlugin)
-	require.NotNil(t, promPlugin)
-
-	ctx := testutils.Context(t)
-
-	// Run OCR methods.
-	_, err := promPlugin.Query(ctx, reportTimestamp)
-	require.NoError(t, err)
-	_, ok := promPlugin.queryEndTimes.Get(timestampToKey(reportTimestamp))
-	require.True(t, ok)
-	time.Sleep(qToOLatency)
-
-	_, err = promPlugin.Observation(ctx, reportTimestamp, nil)
-	require.NoError(t, err)
-	_, ok = promPlugin.observationEndTimes.Get(timestampToKey(reportTimestamp))
-	require.True(t, ok)
-	time.Sleep(oToRLatency)
-
-	_, _, err = promPlugin.Report(ctx, reportTimestamp, nil, nil)
-	require.NoError(t, err)
-	_, ok = promPlugin.reportEndTimes.Get(timestampToKey(reportTimestamp))
-	require.True(t, ok)
-	time.Sleep(rToALatency)
-
-	_, err = promPlugin.ShouldAcceptFinalizedReport(ctx, reportTimestamp, nil)
-	require.NoError(t, err)
-	_, ok = promPlugin.acceptFinalizedReportEndTimes.Get(timestampToKey(reportTimestamp))
-	require.True(t, ok)
-	time.Sleep(aToTLatency)
-
-	_, err = promPlugin.ShouldTransmitAcceptedReport(ctx, reportTimestamp, nil)
-	require.NoError(t, err)
-
-	// Close.
-	err = promPlugin.Close()
-	require.NoError(t, err)
+				big.NewInt(1),
+				types.ReportingPluginConfig{ConfigDigest: reportTimestamp.ConfigDigest},
+				backend,
+			).(*promPlugin)
+			require.NotNil(t, promPlugin)
+
+			ctx := t.Context()
+
+			// Run OCR methods.
+			_, err := promPlugin.Query(ctx, reportTimestamp)
+			require.NoError(t, err)
+			_, ok := promPlugin.queryEndTimes.Get(timestampToKey(reportTimestamp))
+			require.True(t, ok)
+			time.Sleep(qToOLatency)
+
+			_, err = promPlugin.Observation(ctx, reportTimestamp, nil)
+			require.NoError(t, err)
+			_, ok = promPlugin.observationEndTimes.Get(timestampToKey(reportTimestamp))
+			require.True(t, ok)
+			time.Sleep(oToRLatency)
+
+			_, _, err = promPlugin.Report(ctx, reportTimestamp, nil, nil)
+			require.NoError(t, err)
+			_, ok = promPlugin.reportEndTimes.Get(timestampToKey(reportTimestamp))
+			require.True(t, ok)
+			time.Sleep(rToALatency)
+
+			_, err = promPlugin.ShouldAcceptFinalizedReport(ctx, reportTimestamp, nil)
+			require.NoError(t, err)
+			_, ok = promPlugin.acceptFinalizedReportEndTimes.Get(timestampToKey(reportTimestamp))
+			require.True(t, ok)
+			time.Sleep(aToTLatency)
+
+			_, err = promPlugin.ShouldTransmitAcceptedReport(ctx, reportTimestamp, nil)
+			require.NoError(t, err)
+
+			// Close.
+			err = promPlugin.Close()
+			require.NoError(t, err)
+		}
+	})
 }