feat: channel test (#6917)

* feat: channel test

* fix: code smell

setting/operation_setting/monitor_setting_test.go

@@ -55,3 +55,37 @@ func TestGetMonitorSettingPreservesAutoBanOnlyMode(t *testing.T) {
 	require.NotNil(t, setting)
 	assert.Equal(t, ChannelTestModeAutoBanOnly, setting.ChannelTestMode)
 }
+
+func TestGetMonitorSettingNormalizesChannelTestConcurrency(t *testing.T) {
+	orig := monitorSetting
+	t.Cleanup(func() { monitorSetting = orig })
+
+	tests := []struct {
+		name        string
+		concurrency int
+		want        int
+	}{
+		{name: "missing uses safe default", concurrency: 0, want: DefaultChannelTestConcurrency},
+		{name: "configured value is preserved", concurrency: 8, want: 8},
+		{name: "oversized value is capped", concurrency: MaxChannelTestConcurrency + 1, want: MaxChannelTestConcurrency},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			monitorSetting = MonitorSetting{ChannelTestConcurrency: test.concurrency}
+
+			setting := GetMonitorSetting()
+
+			require.NotNil(t, setting)
+			assert.Equal(t, test.want, setting.ChannelTestConcurrency)
+		})
+	}
+}
+
+func TestValidateChannelTestConcurrency(t *testing.T) {
+	require.NoError(t, ValidateChannelTestConcurrency("1"))
+	require.NoError(t, ValidateChannelTestConcurrency("32"))
+	assert.Error(t, ValidateChannelTestConcurrency("0"))
+	assert.Error(t, ValidateChannelTestConcurrency("33"))
+	assert.Error(t, ValidateChannelTestConcurrency("1.5"))
+}