2 files changed, 71 insertions, 0 deletions
diff --git a/android-app/app/src/test/kotlin/androidx/arch/core/executor/testing/InstantTaskExecutorRule.kt b/android-app/app/src/test/kotlin/androidx/arch/core/executor/testing/InstantTaskExecutorRule.kt
new file mode 100644
index 0000000..96bf63a
--- /dev/null
+++ b/android-app/app/src/test/kotlin/androidx/arch/core/executor/testing/InstantTaskExecutorRule.kt
@@ -0,0 +1,13 @@
+package androidx.arch.core.executor.testing
+
+import org.junit.rules.TestRule
+import org.junit.runner.Description
+import org.junit.runners.model.Statement
+
+/**
+ * No-op stub: provides the InstantTaskExecutorRule type so test files compile
+ * on JVM. The real rule is only needed for LiveData; these tests use StateFlow.
+ */
+class InstantTaskExecutorRule : TestRule {
+    override fun apply(base: Statement, description: Description): Statement = base
+}
diff --git a/android-app/app/src/test/kotlin/org/terst/nav/ui/MainViewModelWindTest.kt b/android-app/app/src/test/kotlin/org/terst/nav/ui/MainViewModelWindTest.kt
new file mode 100644
index 0000000..8e7125c
--- /dev/null
+++ b/android-app/app/src/test/kotlin/org/terst/nav/ui/MainViewModelWindTest.kt
@@ -0,0 +1,58 @@
+package org.terst.nav.ui
+
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.runTest
+import kotlinx.coroutines.test.setMain
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.terst.nav.sensors.WindData
+import org.terst.nav.ui.MainViewModel
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class MainViewModelWindTest {
+
+    @get:Rule val instantTask = InstantTaskExecutorRule()
+    private val dispatcher = UnconfinedTestDispatcher()
+
+    @Before fun setUp() { Dispatchers.setMain(dispatcher) }
+    @After fun tearDown() { Dispatchers.resetMain() }
+
+    @Test fun `addGpsPoint uses zero wind when no wind update received`() = runTest {
+        val vm = MainViewModel()
+        vm.startTrack()
+        vm.addGpsPoint(37.0, -122.0, 5.0, 90.0)
+        val pt = vm.trackPoints.value.first()
+        assertEquals(0.0, pt.windSpeedKnots, 0.001)
+        assertEquals(0.0, pt.windAngleDeg, 0.001)
+        assertEquals(false, pt.isTrueWind)
+    }
+
+    @Test fun `addGpsPoint uses latest wind data after updateWind`() = runTest {
+        val vm = MainViewModel()
+        vm.updateWind(WindData(windAngle = 45.0, windSpeed = 15.5, isTrueWind = true, timestampMs = 1000L))
+        vm.startTrack()
+        vm.addGpsPoint(37.0, -122.0, 5.0, 90.0)
+        val pt = vm.trackPoints.value.first()
+        assertEquals(15.5, pt.windSpeedKnots, 0.001)
+        assertEquals(45.0, pt.windAngleDeg, 0.001)
+        assertEquals(true, pt.isTrueWind)
+    }
+
+    @Test fun `addGpsPoint reflects wind update between fixes`() = runTest {
+        val vm = MainViewModel()
+        vm.startTrack()
+        vm.addGpsPoint(37.0, -122.0, 5.0, 90.0)
+        vm.updateWind(WindData(windAngle = 180.0, windSpeed = 8.0, isTrueWind = false, timestampMs = 2000L))
+        vm.addGpsPoint(37.1, -122.0, 5.0, 90.0)
+        val pts = vm.trackPoints.value
+        assertEquals(0.0, pts[0].windSpeedKnots, 0.001)
+        assertEquals(8.0, pts[1].windSpeedKnots, 0.001)
+    }
+}