diff --git a/pkg/tbtc/heartbeat_test.go b/pkg/tbtc/heartbeat_test.go
index 1bbab80b88..3485fd603f 100644
--- a/pkg/tbtc/heartbeat_test.go
+++ b/pkg/tbtc/heartbeat_test.go
@@ -21,6 +21,8 @@ func TestHeartbeatAction_HappyPath(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	walletPublicKeyStr := hex.EncodeToString(walletPublicKeyHex)
+
 	startBlock := uint64(10)
 	expiryBlock := startBlock + heartbeatTotalProposalValidityBlocks
 
@@ -31,7 +33,10 @@ func TestHeartbeatAction_HappyPath(t *testing.T) {
 		},
 	}
 
+	// Set the heartbeat failure counter to `1` for the given wallet. The value
+	// of the counter should be reset to `0` after executing the action.
 	heartbeatFailureCounter := newHeartbeatFailureCounter()
+	heartbeatFailureCounter.increment(walletPublicKeyStr)
 
 	// sha256(sha256(messageToSign))
 	sha256d, err := hex.DecodeString("38d30dacec5083c902952ce99fc0287659ad0b1ca2086827a8e78b0bef2c8bc1")
@@ -42,7 +47,10 @@ func TestHeartbeatAction_HappyPath(t *testing.T) {
 	hostChain := Connect()
 	hostChain.setHeartbeatProposalValidationResult(proposal, true)
 
+	// Set the active operators count to the minimum required value.
 	mockExecutor := &mockHeartbeatSigningExecutor{}
+	mockExecutor.activeOperatorsCount = heartbeatSigningMinimumActiveOperators
+
 	inactivityClaimExecutor := &inactivityClaimExecutor{}
 	action := newHeartbeatAction(
 		logger,
@@ -66,6 +74,12 @@ func TestHeartbeatAction_HappyPath(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	testutils.AssertUintsEqual(
+		t,
+		"heartbeat failure count",
+		0,
+		uint64(heartbeatFailureCounter.get(walletPublicKeyStr)),
+	)
 	testutils.AssertBigIntsEqual(
 		t,
 		"message to sign",
@@ -260,7 +274,8 @@ func TestHeartbeatFailureCounter_Get(t *testing.T) {
 }
 
 type mockHeartbeatSigningExecutor struct {
-	shouldFail bool
+	shouldFail           bool
+	activeOperatorsCount uint32
 
 	requestedMessage    *big.Int
 	requestedStartBlock uint64
@@ -279,5 +294,5 @@ func (mhse *mockHeartbeatSigningExecutor) sign(
 	}
 
 	// TODO: Return the active members count and use it in unit tests.
-	return &tecdsa.Signature{}, 0, startBlock + 1, nil
+	return &tecdsa.Signature{}, mhse.activeOperatorsCount, startBlock + 1, nil
 }