2 files changed, 84 insertions, 0 deletions
diff --git a/test-runner/src/main/kotlin/org/terst/nav/settings/HardwareSource.kt b/test-runner/src/main/kotlin/org/terst/nav/settings/HardwareSource.kt
new file mode 100644
index 0000000..b44cb66
--- /dev/null
+++ b/test-runner/src/main/kotlin/org/terst/nav/settings/HardwareSource.kt
@@ -0,0 +1,23 @@
+package org.terst.nav.settings
+
+enum class HardwareSource(val prefKey: String, val label: String) {
+    AIS_RECEIVER("hw_ais_receiver", "AIS Receiver"),
+    NMEA_INSTRUMENTS("hw_nmea_instruments", "NMEA Instruments")
+}
+
+/** Minimal in-memory implementation for JVM tests. */
+class InMemoryFeatureFlags {
+    private val state = mutableMapOf<HardwareSource, Boolean>()
+
+    fun isEnabled(source: HardwareSource): Boolean = state[source] ?: false
+
+    fun setEnabled(source: HardwareSource, enabled: Boolean) {
+        state[source] = enabled
+    }
+
+    fun toggle(source: HardwareSource): Boolean {
+        val next = !isEnabled(source)
+        setEnabled(source, next)
+        return next
+    }
+}
diff --git a/test-runner/src/test/kotlin/org/terst/nav/settings/FeatureFlagsTest.kt b/test-runner/src/test/kotlin/org/terst/nav/settings/FeatureFlagsTest.kt
new file mode 100644
index 0000000..a8e8271
--- /dev/null
+++ b/test-runner/src/test/kotlin/org/terst/nav/settings/FeatureFlagsTest.kt
@@ -0,0 +1,61 @@
+package org.terst.nav.settings
+
+import org.junit.Assert.*
+import org.junit.Before
+import org.junit.Test
+
+class FeatureFlagsTest {
+
+    private lateinit var flags: InMemoryFeatureFlags
+
+    @Before
+    fun setup() {
+        flags = InMemoryFeatureFlags()
+    }
+
+    @Test
+    fun `all sources default to disabled`() {
+        for (source in HardwareSource.values()) {
+            assertFalse("Expected $source to be disabled by default", flags.isEnabled(source))
+        }
+    }
+
+    @Test
+    fun `setEnabled true enables source`() {
+        flags.setEnabled(HardwareSource.AIS_RECEIVER, true)
+        assertTrue(flags.isEnabled(HardwareSource.AIS_RECEIVER))
+    }
+
+    @Test
+    fun `setEnabled false disables source`() {
+        flags.setEnabled(HardwareSource.AIS_RECEIVER, true)
+        flags.setEnabled(HardwareSource.AIS_RECEIVER, false)
+        assertFalse(flags.isEnabled(HardwareSource.AIS_RECEIVER))
+    }
+
+    @Test
+    fun `toggle flips from false to true`() {
+        val result = flags.toggle(HardwareSource.NMEA_INSTRUMENTS)
+        assertTrue(result)
+        assertTrue(flags.isEnabled(HardwareSource.NMEA_INSTRUMENTS))
+    }
+
+    @Test
+    fun `toggle flips from true to false`() {
+        flags.setEnabled(HardwareSource.NMEA_INSTRUMENTS, true)
+        val result = flags.toggle(HardwareSource.NMEA_INSTRUMENTS)
+        assertFalse(result)
+        assertFalse(flags.isEnabled(HardwareSource.NMEA_INSTRUMENTS))
+    }
+
+    @Test
+    fun `sources are independent`() {
+        flags.setEnabled(HardwareSource.AIS_RECEIVER, true)
+        assertFalse(flags.isEnabled(HardwareSource.NMEA_INSTRUMENTS))
+    }
+
+    @Test
+    fun `toggle returns new state`() {
+        assertFalse(flags.toggle(HardwareSource.AIS_RECEIVER).also { assertTrue(it) } == false)
+    }
+}