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Add deterministic tests for daily tip selection #182

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Add deterministic tests for daily tip selection #182

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17 changes: 13 additions & 4 deletions .../test/java/com/d4rk/androidtutorials/java/data/source/DefaultHomeLocalDataSourceTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.mockStatic;
import static org.mockito.Mockito.when;

import android.content.Context;
Expand All @@ -10,6 +11,7 @@
import com.d4rk.androidtutorials.java.R;

import org.junit.Test;
import org.mockito.MockedStatic;

public class DefaultHomeLocalDataSourceTest {

Expand All @@ -22,14 +24,21 @@ public void playStoreUrlsFormattedCorrectly() {
}

@Test
public void dailyTipUsesEpochDayIndex() {
public void dailyTipReturnsExpectedEntriesForTimestamps() {
String[] tips = {"tip1", "tip2", "tip3"};
Context context = mockContextWithTips(tips);
DefaultHomeLocalDataSource dataSource = new DefaultHomeLocalDataSource(context);

long daysSinceEpoch = System.currentTimeMillis() / (24L * 60L * 60L * 1000L);
int expectedIndex = (int) (daysSinceEpoch % tips.length);
assertEquals(tips[expectedIndex], dataSource.getDailyTip());
long dayMs = 24L * 60L * 60L * 1000L;

try (MockedStatic<System> mocked = mockStatic(System.class)) {
mocked.when(System::currentTimeMillis).thenReturn(0L, dayMs, 2 * dayMs, 3 * dayMs);

assertEquals("tip1", dataSource.getDailyTip());
assertEquals("tip2", dataSource.getDailyTip());
assertEquals("tip3", dataSource.getDailyTip());
assertEquals("tip1", dataSource.getDailyTip());
}
}

private static Context mockContextWithTips(String[] tips) {
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