diff --git a/app/src/androidTest/java/com/todoroo/astrid/service/Upgrade_11_12_3_Test.kt b/app/src/androidTest/java/com/todoroo/astrid/service/Upgrade_11_12_3_Test.kt
new file mode 100644
index 000000000..9133c8889
--- /dev/null
+++ b/app/src/androidTest/java/com/todoroo/astrid/service/Upgrade_11_12_3_Test.kt
@@ -0,0 +1,62 @@
+@file:Suppress("ClassName")
+
+package com.todoroo.astrid.service
+
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.todoroo.astrid.service.Upgrade_11_12_3.Companion.LEGACY_PREFERENCE
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.tasks.TestUtilities.newPreferences
+import org.tasks.preferences.Preferences
+
+@RunWith(AndroidJUnit4::class)
+class Upgrade_11_12_3_Test {
+    private lateinit var preferences: Preferences
+    private lateinit var upgrader: Upgrade_11_12_3
+
+    @Test
+    fun migrateNoDefaultReminders() {
+        preferences.setString(LEGACY_PREFERENCE, "0")
+        upgrader.migrateDefaultReminderPreference()
+
+        assertEquals(emptySet<String>(), preferences.defaultRemindersSet)
+        assertEquals(0, preferences.defaultReminders)
+    }
+
+    @Test
+    fun migrateWhenDue() {
+        preferences.setString(LEGACY_PREFERENCE, "2")
+        upgrader.migrateDefaultReminderPreference()
+
+        assertEquals(setOf("2"), preferences.defaultRemindersSet)
+        assertEquals(2, preferences.defaultReminders)
+    }
+
+    @Test
+    fun migrateWhenOverdue() {
+        preferences.setString(LEGACY_PREFERENCE, "4")
+        upgrader.migrateDefaultReminderPreference()
+
+        assertEquals(setOf("4"), preferences.defaultRemindersSet)
+        assertEquals(4, preferences.defaultReminders)
+    }
+
+    @Test
+    fun migrateWhenDueAndOverdue() {
+        preferences.setString(LEGACY_PREFERENCE, "6")
+        upgrader.migrateDefaultReminderPreference()
+
+        assertEquals(setOf("2", "4"), preferences.defaultRemindersSet)
+        assertEquals(6, preferences.defaultReminders)
+    }
+
+    @Before
+    fun setUp() {
+        preferences = newPreferences(ApplicationProvider.getApplicationContext())
+        preferences.clear()
+        upgrader = Upgrade_11_12_3(preferences)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/todoroo/astrid/service/Upgrade_11_12_3.kt b/app/src/main/java/com/todoroo/astrid/service/Upgrade_11_12_3.kt
index 7af65aa51..687ffcb41 100644
--- a/app/src/main/java/com/todoroo/astrid/service/Upgrade_11_12_3.kt
+++ b/app/src/main/java/com/todoroo/astrid/service/Upgrade_11_12_3.kt
@@ -27,6 +27,6 @@ class Upgrade_11_12_3 @Inject constructor(
 
     companion object {
         const val VERSION = 111203
-        private const val LEGACY_PREFERENCE = "p_def_reminders"
+        internal const val LEGACY_PREFERENCE = "p_def_reminders"
     }
 }
\ No newline at end of file