For #18836: refactor tests to forEachHotStartEntries.

app/src/test/java/org/mozilla/fenix/perf/StartupStateProviderTest.kt

@@ -49,7 +49,14 @@ class StartupStateProviderTest {
     @Test
     fun `GIVEN the app started for an activity WHEN warm start THEN cold start is false`() {
         forEachWarmStartEntries { index ->
-            assertFalse(provider.isColdStartForStartedActivity(homeActivityClass))
+            assertFalse("$index", provider.isColdStartForStartedActivity(homeActivityClass))
+        }
+    }
+
+    @Test
+    fun `GIVEN the app started for an activity WHEN hot start THEN cold start is false` () {
+        forEachHotStartEntries { index ->
+            assertFalse("$index", provider.isColdStartForStartedActivity(homeActivityClass))
         }
     }
 
@@ -82,34 +89,6 @@ class StartupStateProviderTest {
         assertFalse(provider.isColdStartForStartedActivity(homeActivityClass))
     }
 
-    @Test
-    fun `GIVEN the app started for an activity and we're truncating the log for optimization WHEN hot start THEN start up is not cold`() {
-        // These entries are from observed behavior.
-        logEntries.addAll(listOf(
-            LogEntry.AppStopped,
-            LogEntry.ActivityStopped(homeActivityClass),
-            LogEntry.ActivityStarted(homeActivityClass),
-            LogEntry.AppStarted
-        ))
-        assertFalse(provider.isColdStartForStartedActivity(homeActivityClass))
-    }
-
-    @Test
-    fun `GIVEN the app started for an activity and we're not truncating the log for optimization WHEN hot start THEN start up is not cold`() {
-        // This shouldn't occur in the wild due to the optimization but, just in case the behavior changes,
-        // we check for it.
-        logEntries.addAll(listOf(
-            LogEntry.ActivityCreated(homeActivityClass),
-            LogEntry.ActivityStarted(homeActivityClass),
-            LogEntry.AppStarted,
-            LogEntry.AppStopped,
-            LogEntry.ActivityStopped(homeActivityClass),
-            LogEntry.ActivityStarted(homeActivityClass),
-            LogEntry.AppStarted
-        ))
-        assertFalse(provider.isColdStartForStartedActivity(homeActivityClass))
-    }
-
     @Test
     fun `GIVEN the app started for an activity WHEN multiple activities are started but not stopped (maybe impossible) THEN start up is not cold`() {
         fun assertIsNotCold() { assertFalse(provider.isColdStartForStartedActivity(homeActivityClass)) }
@@ -231,6 +210,34 @@ class StartupStateProviderTest {
         forEachStartEntry(warmStartEntries, block)
     }
 
+    private fun forEachHotStartEntries(block: (index: Int) -> Unit) {
+        // These entries mimic observed behavior. We test both truncated (i.e. the current behavior
+        // with the optimization to prevent an infinite log) and untruncated (the behavior without
+        // such an optimization).
+        //
+        // truncated MAIN: open HomeActivity directly.
+        val hotStartEntries = listOf(listOf(
+            LogEntry.AppStopped,
+            LogEntry.ActivityStopped(homeActivityClass),
+            LogEntry.ActivityStarted(homeActivityClass),
+            LogEntry.AppStarted
+
+            // untruncated MAIN: open HomeActivity directly.
+        ), listOf(
+            LogEntry.ActivityCreated(homeActivityClass),
+            LogEntry.ActivityStarted(homeActivityClass),
+            LogEntry.AppStarted,
+            LogEntry.AppStopped,
+            LogEntry.ActivityStopped(homeActivityClass),
+            LogEntry.ActivityStarted(homeActivityClass),
+            LogEntry.AppStarted
+        ))
+
+        // TODO: add VIEW.
+
+        forEachStartEntry(hotStartEntries, block)
+    }
+
     private fun forEachStartEntry(entries: List<List<LogEntry>>, block: (index: Int) -> Unit) {
         entries.forEachIndexed { index, startEntry ->
             logEntries.clear()