49 lines
2.1 KiB
Kotlin
49 lines
2.1 KiB
Kotlin
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package com.hawhamburg.micr0bu
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import com.hawhamburg.micr0bu.domain.asn1.CamUperCodec
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import com.hawhamburg.micr0bu.domain.cam.StationType
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import org.junit.Assert.assertEquals
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import org.junit.Assert.assertNotNull
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import org.junit.Test
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/**
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* A roadside unit's CAM must decode, not be dropped.
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*
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* ETSI's `HighFrequencyContainer` is a CHOICE, and an RSU picks `rsuContainerHighFrequency`
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* instead of `basicVehicleContainerHighFrequency`. That container holds no kinematics at all -
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* only an optional protected-zone list - so an earlier version of the decoder bailed on it and
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* every RSU CAM was silently discarded. The bench RSU sends CAM and SPATEM from the same station
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* id, so dropping its CAM meant the one station a rider most wants to see never appeared.
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*
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* The fixture is a real 26-byte RSU CAM taken live from the OBU's `v2x/rx/cam` topic; the
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* expected values are asn1tools' decoding of those same bytes using the ETSI modules in the
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* `C-ITS-Parser` checkout.
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*/
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class RsuCamDecodeTest {
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private val rsuCam = "020239b9de898b8b00fab215af6e286477c0c20c200033fa4e80"
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private fun String.hexToBytes(): ByteArray =
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chunked(2).map { it.toInt(16).toByte() }.toByteArray()
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@Test
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fun `decodes a roadside unit CAM for position and station type`() {
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val cam = CamUperCodec.decode(rsuCam.hexToBytes(), receivedAtEpochMs = 1_787_100_000_000L)
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assertNotNull("an RSU CAM must not be dropped", cam)
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cam!!
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assertEquals(968_482_441L, cam.stationId)
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assertEquals(StationType.ROAD_SIDE_UNIT, cam.stationType)
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assertEquals(15, cam.stationType) // the enumeration jumps 11 -> 15; 12 would be wrong
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assertEquals(53.5544955, cam.latitude, 1e-7)
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assertEquals(10.0225470, cam.longitude, 1e-7)
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// An RSU has no kinematics to report. Zero is a placeholder, which is only safe because
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// CamUseCaseRepository keeps RSU CAMs out of UseCaseDetectionEngine - otherwise this
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// would read as a permanently stopped vehicle and raise a standing false alert.
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assertEquals(0.0, cam.speedMps, 0.0)
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assertEquals(0.0, cam.headingDeg, 0.0)
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}
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}
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