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package org.terst.nav.nmea
import org.junit.Assert.*
import org.junit.Before
import org.junit.Test
class NmeaParserTest {
private lateinit var parser: NmeaParser
@Before
fun setUp() {
parser = NmeaParser()
}
// $GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
// lat: 48 + 7.038/60 = 48.1173°N, lon: 11 + 31.000/60 = 11.51667°E
// SOG 22.4 kn, COG 84.4°
@Test
fun `valid RMC sentence parses latitude and longitude`() {
val sentence = "\$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A"
val pos = parser.parseRmc(sentence)
assertNotNull(pos)
assertEquals(48.1173, pos!!.latitude, 0.0001)
assertEquals(11.51667, pos.longitude, 0.0001)
}
@Test
fun `valid RMC sentence parses SOG and COG`() {
val sentence = "\$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A"
val pos = parser.parseRmc(sentence)
assertNotNull(pos)
assertEquals(22.4, pos!!.sog, 0.001)
assertEquals(84.4, pos.cog, 0.001)
}
@Test
fun `void status V returns null`() {
val sentence = "\$GPRMC,123519,V,4807.038,N,01131.000,E,,,230394,003.1,W"
assertNull(parser.parseRmc(sentence))
}
@Test
fun `malformed sentence with too few fields returns null`() {
assertNull(parser.parseRmc("\$GPRMC,123519,A"))
}
@Test
fun `empty string returns null`() {
assertNull(parser.parseRmc(""))
}
@Test
fun `non-NMEA string returns null`() {
assertNull(parser.parseRmc("NOT_NMEA_DATA"))
}
@Test
fun `south latitude is negative`() {
// lat: -(42 + 50.5589/60) = -42.84265
val sentence = "\$GPRMC,092204.999,A,4250.5589,S,14718.5084,E,0.00,89.68,211200,,"
val pos = parser.parseRmc(sentence)
assertNotNull(pos)
assertTrue("South latitude must be negative", pos!!.latitude < 0)
assertEquals(-42.84265, pos.latitude, 0.0001)
}
@Test
fun `west longitude is negative`() {
// lon: -(11 + 31.000/60) = -11.51667
val sentence = "\$GPRMC,123519,A,4807.038,N,01131.000,W,022.4,084.4,230394,003.1,E"
val pos = parser.parseRmc(sentence)
assertNotNull(pos)
assertTrue("West longitude must be negative", pos!!.longitude < 0)
assertEquals(-11.51667, pos.longitude, 0.0001)
}
@Test
fun `SOG and COG parse with decimal precision`() {
// lon: -(118 + 1.5678/60) = -118.02613, lat: 33 + 52.1234/60 = 33.86872
val sentence = "\$GPRMC,093456,A,3352.1234,N,11801.5678,W,12.345,270.5,140326,,"
val pos = parser.parseRmc(sentence)
assertNotNull(pos)
assertEquals(12.345, pos!!.sog, 0.0001)
assertEquals(270.5, pos.cog, 0.0001)
}
@Test
fun `empty SOG and COG fields default to zero`() {
val sentence = "\$GPRMC,123519,A,4807.038,N,01131.000,E,,,230394,003.1,W"
val pos = parser.parseRmc(sentence)
assertNotNull(pos)
assertEquals(0.0, pos!!.sog, 0.001)
assertEquals(0.0, pos.cog, 0.001)
}
@Test
fun `non-RMC sentence returns null`() {
val sentence = "\$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,"
assertNull(parser.parseRmc(sentence))
}
}
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