[#171] pool: Add test for healthy status monitor

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

pool/pool_test.go

@@ -523,6 +523,44 @@ func TestStatusMonitor(t *testing.T) {
 
 	require.Equal(t, uint64(count), monitor.overallErrorRate())
 	require.Equal(t, uint32(1), monitor.currentErrorRate())
+
+	t.Run("healthy status", func(t *testing.T) {
+		cases := []struct {
+			action      func(*clientStatusMonitor)
+			status      uint32
+			isDialed    bool
+			isHealthy   bool
+			description string
+		}{
+			{
+				action:      func(m *clientStatusMonitor) { m.setUnhealthyOnDial() },
+				status:      statusUnhealthyOnDial,
+				isDialed:    false,
+				isHealthy:   false,
+				description: "set unhealthy on dial",
+			},
+			{
+				action:      func(m *clientStatusMonitor) { m.setUnhealthy() },
+				status:      statusUnhealthyOnRequest,
+				isDialed:    true,
+				isHealthy:   false,
+				description: "set unhealthy on request",
+			},
+			{
+				action:      func(m *clientStatusMonitor) { m.setHealthy() },
+				status:      statusHealthy,
+				isDialed:    true,
+				isHealthy:   true,
+				description: "set healthy",
+			},
+		}
+		for _, tc := range cases {
+			tc.action(&monitor)
+			require.Equal(t, tc.status, monitor.healthy.Load())
+			require.Equal(t, tc.isDialed, monitor.isDialed())
+			require.Equal(t, tc.isHealthy, monitor.isHealthy())
+		}
+	})
 }
 
 func TestHandleError(t *testing.T) {