Convert class 'Clock' to an interface

app/core/src/main/java/com/fsck/k9/Clock.kt

@@ -1,32 +1,13 @@
-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.fsck.k9;
+package com.fsck.k9
 
 /**
- * A class provide the current time (like {@link System#currentTimeMillis()}).
- * It's intended to be mocked out for unit tests.
+ * An interface to provide the current time.
  */
-public class Clock {
-    public static final Clock INSTANCE = new Clock();
-
-    protected Clock() {
-    }
-
-    public long getTime() {
-        return System.currentTimeMillis();
-    }
+interface Clock {
+    val time: Long
+}
+
+internal class RealClock : Clock {
+    override val time: Long
+        get() = System.currentTimeMillis()
 }

app/core/src/main/java/com/fsck/k9/K9.kt

@@ -268,7 +268,8 @@ object K9 : EarlyInit {
                 return false
             }
 
-            val quietTimeChecker = QuietTimeChecker(Clock.INSTANCE, quietTimeStarts, quietTimeEnds)
+            val clock = DI.get<Clock>()
+            val quietTimeChecker = QuietTimeChecker(clock, quietTimeStarts, quietTimeEnds)
             return quietTimeChecker.isQuietTime
         }
 

app/core/src/main/java/com/fsck/k9/KoinModule.kt

@@ -30,7 +30,7 @@ val mainModule = module {
     single { TrustManagerFactory.createInstance(get()) }
     single { LocalKeyStoreManager(get()) }
     single<TrustedSocketFactory> { DefaultTrustedSocketFactory(get(), get()) }
-    single { Clock.INSTANCE }
+    single<Clock> { RealClock() }
     factory { ServerNameSuggester() }
     factory { EmailAddressValidator() }
     factory { ServerSettingsSerializer() }

app/core/src/main/java/com/fsck/k9/job/KoinModule.kt

@@ -1,7 +1,6 @@
 package com.fsck.k9.job
 
 import androidx.work.WorkerFactory
-import com.fsck.k9.Clock
 import org.koin.dsl.module
 
 val jobModule = module {
@@ -9,5 +8,5 @@ val jobModule = module {
     single<WorkerFactory> { K9WorkerFactory(get(), get()) }
     single { get<WorkManagerProvider>().getWorkManager() }
     single { K9JobManager(get(), get(), get()) }
-    factory { MailSyncWorkerManager(get(), Clock.INSTANCE) }
+    factory { MailSyncWorkerManager(workManager = get(), clock = get()) }
 }

app/core/src/test/java/com/fsck/k9/QuietTimeCheckerTest.kt

@@ -4,11 +4,9 @@ import java.util.Calendar
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
 import org.junit.Test
-import org.mockito.Mockito.mock
-import org.mockito.kotlin.whenever
 
 class QuietTimeCheckerTest {
-    private val clock = mock(Clock::class.java)
+    private val clock = TestClock()
 
     @Test
     fun endTimeBeforeStartTime_timeIsBeforeEndOfQuietTime() {
@@ -113,7 +111,6 @@ class QuietTimeCheckerTest {
         calendar.set(Calendar.HOUR_OF_DAY, hourOfDay)
         calendar.set(Calendar.MINUTE, minute)
 
-        val timeInMillis = calendar.timeInMillis
-        whenever(clock.time).thenReturn(timeInMillis)
+        clock.time = calendar.timeInMillis
     }
 }

app/testing/src/main/java/com/fsck/k9/TestClock.kt

@@ -0,0 +1,5 @@
+package com.fsck.k9
+
+class TestClock(initialTime: Long = 0L) : Clock {
+    override var time: Long = initialTime
+}

app/ui/legacy/src/main/java/com/fsck/k9/fragment/MessageListFragment.kt

@@ -70,6 +70,7 @@ class MessageListFragment :
     private val folderNameFormatter: FolderNameFormatter by lazy { folderNameFormatterFactory.create(requireContext()) }
     private val messagingController: MessagingController by inject()
     private val preferences: Preferences by inject()
+    private val clock: Clock by inject()
 
     private val handler = MessageListHandler(this)
     private val activityListener = MessageListActivityListener()
@@ -252,7 +253,7 @@ class MessageListFragment :
             contactsPictureLoader = ContactPicture.getContactPictureLoader(),
             listItemListener = this,
             appearance = messageListAppearance,
-            relativeDateTimeFormatter = RelativeDateTimeFormatter(requireContext(), Clock.INSTANCE)
+            relativeDateTimeFormatter = RelativeDateTimeFormatter(requireContext(), clock)
         )
 
         adapter.activeMessage = activeMessage

app/ui/legacy/src/test/java/com/fsck/k9/fragment/MessageListAdapterTest.kt

@@ -13,11 +13,11 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import com.fsck.k9.Account
-import com.fsck.k9.Clock
 import com.fsck.k9.FontSizes
 import com.fsck.k9.FontSizes.FONT_DEFAULT
 import com.fsck.k9.FontSizes.LARGE
 import com.fsck.k9.RobolectricTest
+import com.fsck.k9.TestClock
 import com.fsck.k9.contacts.ContactPictureLoader
 import com.fsck.k9.mail.Address
 import com.fsck.k9.textString
@@ -464,7 +464,7 @@ class MessageListAdapterTest : RobolectricTest() {
             contactsPictureLoader = contactsPictureLoader,
             listItemListener = listItemListener,
             appearance = appearance,
-            relativeDateTimeFormatter = RelativeDateTimeFormatter(context, Clock.INSTANCE)
+            relativeDateTimeFormatter = RelativeDateTimeFormatter(context, TestClock())
         )
     }
 

app/ui/legacy/src/test/java/com/fsck/k9/ui/helper/RelativeDateTimeFormatterTest.kt

@@ -1,8 +1,8 @@
 package com.fsck.k9.ui.helper
 
 import android.os.SystemClock
-import com.fsck.k9.Clock
 import com.fsck.k9.RobolectricTest
+import com.fsck.k9.TestClock
 import java.time.LocalDate
 import java.time.LocalDateTime
 import java.time.ZoneId
@@ -10,8 +10,6 @@ import java.util.TimeZone
 import org.junit.Assert.assertEquals
 import org.junit.Before
 import org.junit.Test
-import org.mockito.Mockito
-import org.mockito.kotlin.whenever
 import org.robolectric.RuntimeEnvironment
 import org.robolectric.annotation.Config
 
@@ -19,7 +17,7 @@ import org.robolectric.annotation.Config
 class RelativeDateTimeFormatterTest : RobolectricTest() {
 
     private val context = RuntimeEnvironment.application.applicationContext
-    private val clock = Mockito.mock(Clock::class.java)
+    private val clock = TestClock()
     private val dateTimeFormatter = RelativeDateTimeFormatter(context, clock)
 
     private val zoneId = "Europe/Berlin"
@@ -123,7 +121,7 @@ class RelativeDateTimeFormatterTest : RobolectricTest() {
         val dateTime = LocalDateTime.parse(time)
         val timeInMillis = dateTime.toEpochMillis()
         SystemClock.setCurrentTimeMillis(timeInMillis) // Is handled by ShadowSystemClock
-        whenever(clock.time).thenReturn(timeInMillis)
+        clock.time = timeInMillis
     }
 
     private fun String.toEpochMillis() = LocalDateTime.parse(this).toEpochMillis()