[#756] adm: Add polling interval increase

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

cmd/frostfs-adm/internal/modules/morph/initialize_test.go

@@ -145,3 +145,38 @@ func setTestCredentials(v *viper.Viper, size int) {
 	}
 	v.Set("credentials.contract", testContractPassword)
 }
+
+func TestNextPollInterval(t *testing.T) {
+	var pollInterval time.Duration
+	var iteration int
+
+	pollInterval, hasChanged := nextPollInterval(iteration, pollInterval)
+	require.True(t, hasChanged)
+	require.Equal(t, time.Second, pollInterval)
+
+	iteration = 4
+	pollInterval, hasChanged = nextPollInterval(iteration, pollInterval)
+	require.False(t, hasChanged)
+	require.Equal(t, time.Second, pollInterval)
+
+	iteration = 5
+	pollInterval, hasChanged = nextPollInterval(iteration, pollInterval)
+	require.True(t, hasChanged)
+	require.Equal(t, 2*time.Second, pollInterval)
+
+	iteration = 10
+	pollInterval, hasChanged = nextPollInterval(iteration, pollInterval)
+	require.True(t, hasChanged)
+	require.Equal(t, 4*time.Second, pollInterval)
+
+	iteration = 20
+	pollInterval = 32 * time.Second
+	pollInterval, hasChanged = nextPollInterval(iteration, pollInterval)
+	require.True(t, hasChanged) // from 32s to 16s
+	require.Equal(t, 16*time.Second, pollInterval)
+
+	pollInterval = 16 * time.Second
+	pollInterval, hasChanged = nextPollInterval(iteration, pollInterval)
+	require.False(t, hasChanged)
+	require.Equal(t, 16*time.Second, pollInterval)
+}