[fenix] Closes https://github.com/mozilla-mobile/fenix/issues/22671: Show correct time groups header in history

app/src/main/java/org/mozilla/fenix/library/history/HistoryAdapter.kt

@@ -5,9 +5,9 @@
 package org.mozilla.fenix.library.history
 
 import android.content.Context
-import android.text.format.DateUtils
 import android.view.LayoutInflater
 import android.view.ViewGroup
+import androidx.annotation.VisibleForTesting
 import androidx.paging.PagedListAdapter
 import androidx.recyclerview.widget.DiffUtil
 import org.mozilla.fenix.R
@@ -87,24 +87,29 @@ class HistoryAdapter(
         private const val oneDay = 1
         private const val sevenDays = 7
         private const val thirtyDays = 30
-        private val zeroDaysAgo = getDaysAgo(zeroDays).time
+        private val today = getDaysAgo(zeroDays).time
-        private val oneDayAgo = getDaysAgo(oneDay).time
+        private val yesterday = getDaysAgo(oneDay).time
         private val sevenDaysAgo = getDaysAgo(sevenDays).time
         private val thirtyDaysAgo = getDaysAgo(thirtyDays).time
-        private val yesterdayRange = LongRange(oneDayAgo, zeroDaysAgo)
+        private val todayRange = LongRange(today, Long.MAX_VALUE) // all future time is considered today
-        private val lastWeekRange = LongRange(sevenDaysAgo, oneDayAgo)
+        private val yesterdayRange = LongRange(yesterday, today)
+        private val lastWeekRange = LongRange(sevenDaysAgo, yesterday)
         private val lastMonthRange = LongRange(thirtyDaysAgo, sevenDaysAgo)
 
         private fun getDaysAgo(daysAgo: Int): Date {
-            val calendar = Calendar.getInstance()
+            return Calendar.getInstance().apply {
-            calendar.add(Calendar.DAY_OF_YEAR, -daysAgo)
+                set(Calendar.HOUR_OF_DAY, 0)
-
+                set(Calendar.MINUTE, 0)
-            return calendar.time
+                set(Calendar.SECOND, 0)
+                set(Calendar.MILLISECOND, 0)
+                add(Calendar.DAY_OF_YEAR, -daysAgo)
+            }.time
         }
 
-        private fun timeGroupForHistoryItem(item: History): HistoryItemTimeGroup {
+        @VisibleForTesting
+        internal fun timeGroupForHistoryItem(item: History): HistoryItemTimeGroup {
             return when {
-                DateUtils.isToday(item.visitedAt) -> HistoryItemTimeGroup.Today
+                todayRange.contains(item.visitedAt) -> HistoryItemTimeGroup.Today
                 yesterdayRange.contains(item.visitedAt) -> HistoryItemTimeGroup.Yesterday
                 lastWeekRange.contains(item.visitedAt) -> HistoryItemTimeGroup.ThisWeek
                 lastMonthRange.contains(item.visitedAt) -> HistoryItemTimeGroup.ThisMonth

app/src/test/java/org/mozilla/fenix/library/history/HistoryAdapterTest.kt

@@ -0,0 +1,205 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+   License, v. 2.0. If a copy of the MPL was not distributed with this
+   file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.library.history
+
+import android.text.format.DateUtils
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import java.util.Calendar
+
+class HistoryAdapterTest {
+
+    @Test
+    fun `WHEN grouping history item with future date THEN item is grouped to today`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = System.currentTimeMillis() + DateUtils.WEEK_IN_MILLIS
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.Today, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with today's date THEN item is grouped to today`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = System.currentTimeMillis() - DateUtils.MINUTE_IN_MILLIS
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.Today, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with today's midnight date THEN item is grouped to today`() {
+        val calendar = Calendar.getInstance().apply {
+            set(Calendar.HOUR_OF_DAY, 0)
+            set(Calendar.MINUTE, 0)
+            set(Calendar.SECOND, 0)
+        }
+
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = calendar.timeInMillis
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.Today, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with yesterday's night date THEN item is grouped to yesterday`() {
+        val calendar = Calendar.getInstance().apply {
+            set(Calendar.HOUR_OF_DAY, 0)
+            set(Calendar.MINUTE, 0)
+            set(Calendar.SECOND, 0)
+        }
+
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = calendar.timeInMillis - DateUtils.HOUR_IN_MILLIS
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.Yesterday, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with 23 hours before midnight date THEN item is grouped to yesterday`() {
+        val calendar = Calendar.getInstance()
+        calendar.set(Calendar.HOUR_OF_DAY, 0)
+        calendar.set(Calendar.MINUTE, 0)
+        calendar.set(Calendar.SECOND, 0)
+
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = calendar.timeInMillis - (DateUtils.HOUR_IN_MILLIS * 23)
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.Yesterday, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with 25 hours before midnight date THEN item is grouped to this week`() {
+        val calendar = Calendar.getInstance().apply {
+            set(Calendar.HOUR_OF_DAY, 0)
+            set(Calendar.MINUTE, 0)
+            set(Calendar.SECOND, 0)
+        }
+
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = calendar.timeInMillis - (DateUtils.HOUR_IN_MILLIS * 25)
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.ThisWeek, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with 3 days ago date THEN item is grouped to this week`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = System.currentTimeMillis() - (DateUtils.DAY_IN_MILLIS * 3)
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.ThisWeek, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with 6 days ago date THEN item is grouped to this week`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = System.currentTimeMillis() - (DateUtils.DAY_IN_MILLIS * 6)
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.ThisWeek, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with 8 days ago date THEN item is grouped to this month`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = System.currentTimeMillis() - (DateUtils.DAY_IN_MILLIS * 8)
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.ThisMonth, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with 29 days ago date THEN item is grouped to this month`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = System.currentTimeMillis() - (DateUtils.DAY_IN_MILLIS * 29)
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.ThisMonth, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with 31 days ago date THEN item is grouped to older`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = System.currentTimeMillis() - (DateUtils.DAY_IN_MILLIS * 31)
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.Older, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with zero date THEN item is grouped to older`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = 0
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.Older, timeGroup)
+    }
+
+    @Test
+    fun `WHEN grouping history item with negative date THEN item is grouped to older`() {
+        val history = History.Regular(
+            id = 1,
+            title = "test item",
+            url = "url",
+            visitedAt = -100
+        )
+
+        val timeGroup = HistoryAdapter.timeGroupForHistoryItem(history as History)
+        assertEquals(HistoryItemTimeGroup.Older, timeGroup)
+    }
+}