Add missing tests

Author: Pygmalion69

app/src/androidTest/java/org/nitri/opentopo/util/GpxPreferenceTest.kt

@@ -0,0 +1,38 @@
+package org.nitri.opentopo.util
+
+import androidx.preference.PreferenceManager
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.nitri.opentopo.defaultGpxTrackColor
+import org.nitri.opentopo.SettingsActivity
+import org.nitri.opentopo.ui.color.DEFAULT_GPX_TRACK_COLOR
+
+@RunWith(AndroidJUnit4::class)
+class GpxPreferenceTest {
+
+    private val context = InstrumentationRegistry.getInstrumentation().targetContext
+
+    @Before
+    fun setup() {
+        PreferenceManager.getDefaultSharedPreferences(context).edit().clear().commit()
+    }
+
+    @Test
+    fun defaultGpxTrackColor_returnsDefaultWhenUnset() {
+        assertEquals(DEFAULT_GPX_TRACK_COLOR, context.defaultGpxTrackColor())
+    }
+
+    @Test
+    fun defaultGpxTrackColor_returnsStoredValue() {
+        val customColor = 0xFF654321.toInt()
+        PreferenceManager.getDefaultSharedPreferences(context).edit()
+            .putInt(SettingsActivity.PREF_GPX_TRACK_COLOR, customColor)
+            .commit()
+
+        assertEquals(customColor, context.defaultGpxTrackColor())
+    }
+}

app/src/test/java/org/nitri/opentopo/ui/color/PaletteTest.kt

@@ -0,0 +1,16 @@
+package org.nitri.opentopo.ui.color
+
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class PaletteTest {
+
+    @Test
+    fun testPalette() {
+        assertTrue("Default GPX color should be in the palette",
+            APP_COLOR_PALETTE.contains(DEFAULT_GPX_TRACK_COLOR))
+        
+        assertTrue("Legacy marker color should be in the palette",
+            APP_COLOR_PALETTE.contains(DEFAULT_MARKER_COLOR))
+    }
+}