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package org.terst.nav.gps
import org.junit.Assert.*
import org.junit.Before
import org.junit.Test
// ── Fake implementation (no Android dependencies) ────────────────────────────
class FakeGpsProvider : GpsProvider {
var currentPosition: GpsPosition? = null
private val listeners = mutableListOf<GpsListener>()
var started = false
override fun start() { started = true }
override fun stop() { started = false }
override val position: GpsPosition? get() = currentPosition
override fun addListener(listener: GpsListener) { listeners.add(listener) }
override fun removeListener(listener: GpsListener) { listeners.remove(listener) }
fun simulatePosition(pos: GpsPosition) {
currentPosition = pos
listeners.forEach { it.onPositionUpdate(pos) }
}
fun simulateFixLost() { listeners.forEach { it.onFixLost() } }
}
// ── Test helpers ─────────────────────────────────────────────────────────────
private fun makePosition(lat: Double = 41.0, lon: Double = -71.0, sog: Double = 5.0) =
GpsPosition(lat, lon, sog, cog = 180.0, timestampMs = 1_000L)
private class RecordingListener : GpsListener {
val positions = mutableListOf<GpsPosition>()
var fixLostCount = 0
override fun onPositionUpdate(position: GpsPosition) { positions.add(position) }
override fun onFixLost() { fixLostCount++ }
}
// ── Tests ─────────────────────────────────────────────────────────────────────
class GpsProviderTest {
private lateinit var provider: FakeGpsProvider
@Before
fun setUp() {
provider = FakeGpsProvider()
}
@Test
fun `start sets started to true`() {
provider.start()
assertTrue(provider.started)
}
@Test
fun `stop sets started to false`() {
provider.start()
provider.stop()
assertFalse(provider.started)
}
@Test
fun `listener receives position update`() {
val listener = RecordingListener()
provider.addListener(listener)
val pos = makePosition()
provider.simulatePosition(pos)
assertEquals(1, listener.positions.size)
assertEquals(pos, listener.positions[0])
}
@Test
fun `listener notified of fix lost`() {
val listener = RecordingListener()
provider.addListener(listener)
provider.simulateFixLost()
assertEquals(1, listener.fixLostCount)
}
@Test
fun `multiple listeners all receive position update`() {
val l1 = RecordingListener()
val l2 = RecordingListener()
val l3 = RecordingListener()
provider.addListener(l1)
provider.addListener(l2)
provider.addListener(l3)
provider.simulatePosition(makePosition())
assertEquals(1, l1.positions.size)
assertEquals(1, l2.positions.size)
assertEquals(1, l3.positions.size)
}
@Test
fun `multiple listeners all notified of fix lost`() {
val l1 = RecordingListener()
val l2 = RecordingListener()
provider.addListener(l1)
provider.addListener(l2)
provider.simulateFixLost()
assertEquals(1, l1.fixLostCount)
assertEquals(1, l2.fixLostCount)
}
@Test
fun `removing listener stops notifications`() {
val listener = RecordingListener()
provider.addListener(listener)
provider.removeListener(listener)
provider.simulatePosition(makePosition())
provider.simulateFixLost()
assertEquals(0, listener.positions.size)
assertEquals(0, listener.fixLostCount)
}
@Test
fun `position property reflects last simulated position`() {
assertNull(provider.position)
val pos = makePosition(lat = 42.5, lon = -70.0)
provider.simulatePosition(pos)
assertEquals(pos, provider.position)
}
@Test
fun `SOG conversion sanity check - 1 mps is approximately 1_94384 knots`() {
// 1 m/s * 1.94384 = 1.94384 knots — validate constant used in DeviceGpsProvider
val knots = 1.0 * 1.94384
assertEquals(1.94384, knots, 0.00001)
}
}
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