60 lines
2.2 KiB
Kotlin
60 lines
2.2 KiB
Kotlin
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package com.hawhamburg.micr0bu
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import com.hawhamburg.micr0bu.domain.asn1.VamContent
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import com.hawhamburg.micr0bu.domain.asn1.VamUperCodec
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import org.junit.Assert.assertEquals
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import org.junit.Test
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/**
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* Pins the VAM encoder against bytes this code did not produce.
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*
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* ## Where the expected bytes come from
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* asn1tools 0.167, compiling the ETSI modules vanetza-idf ships (asn1/release2:
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* TS102894-2v241-CDD.asn, TS103300-3v231/VAM-PDU-Descriptions.asn and its motorcyclist container),
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* encoding the same values as a Python dict: the same toolchain the colleague's reference VBS
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* (microbu-esp32c5/station-link/python/microbu_link/vbs.py) builds its VAMs with. Station
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* 0x12345678, fix at Unix ms 1790170000123 (generationDeltaTime 45819), 53.5546667 N
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* 10.0223889 E, 5.43 m/s, heading 123.4 deg, -1.26 m/s^2; every confidence and the altitude
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* unavailable, as the encoder sends them.
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*/
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class VamUperCodecTest {
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private fun ByteArray.hex(): String = joinToString("") { "%02x".format(it) }
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private fun content(includeLowFrequency: Boolean, accuracyM: Float? = 3.0f) = VamContent(
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stationId = 0x12345678,
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timestamp = 1_790_170_000_123L,
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latitude = 53.5546667,
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longitude = 10.0223889,
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accuracyM = accuracyM,
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speedMps = 5.43,
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headingDeg = 123.4,
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accelerationMps2 = -1.26,
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includeLowFrequency = includeLowFrequency,
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)
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@Test
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fun `VAM with the low-frequency container matches asn1tools`() {
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assertEquals(
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"031012345678b2fb400aac85a15b8a18ec88f30f3708eddd0f8002697e087ff24f322220",
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VamUperCodec.encode(content(includeLowFrequency = true)).hex(),
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)
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}
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@Test
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fun `VAM without the low-frequency container matches asn1tools`() {
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assertEquals(
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"031012345678b2fb000aac85a15b8a18ec88f30f3708eddd0f8002697e087ff24f30",
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VamUperCodec.encode(content(includeLowFrequency = false)).hex(),
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)
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}
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@Test
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fun `unknown accuracy encodes the confidence ellipse as unavailable`() {
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assertEquals(
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"031012345678b2fb000aac85a15b8a18ec8fffffff08eddd0f8002697e087ff24f30",
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VamUperCodec.encode(content(includeLowFrequency = false, accuracyM = null)).hex(),
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)
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}
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}
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