add tests for nil values

internal/domains/sensors/domain_test.go

@@ -256,6 +256,16 @@ func Test_SensorData_IsOutOfRangeAbove(t *testing.T) {
 			},
 			expected: true,
 		},
+		{
+			name: "nil values",
+			data: SensorData{
+				SensorID: "temp-001",
+			},
+			sensor: Sensor{
+				SensorID: "temp-001",
+			},
+			expected: false,
+		},
 	}
 
 	for _, tt := range tests {
@@ -343,6 +353,16 @@ func Test_SensorData_IsOutOfRangeBelow(t *testing.T) {
 			},
 			expected: true,
 		},
+		{
+			name: "nil values",
+			data: SensorData{
+				SensorID: "temp-001",
+			},
+			sensor: Sensor{
+				SensorID: "temp-001",
+			},
+			expected: false,
+		},
 	}
 
 	for _, tt := range tests {