Add unit tests for ClearCache, verifying deletion of old cache files and handling of empty directories to ensure correct cache management behavior and enhance test coverage.

Author: harshithad0703

contentstack/src/test/java/com/contentstack/sdk/TestClearCache.java

@@ -0,0 +1,101 @@
+package com.contentstack.sdk;
+
+import android.content.Context;
+import android.content.Intent;
+
+import org.json.JSONObject;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.util.Calendar;
+import java.util.TimeZone;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+public class TestClearCache {
+
+    private File createTempDir() {
+        File dir = new File(System.getProperty("java.io.tmpdir"),
+                "ContentstackCacheTest_" + System.nanoTime());
+        //noinspection ResultOfMethodCallIgnored
+        dir.mkdirs();
+        return dir;
+    }
+
+    private File writeCacheFile(File dir, String name, long timestampMillis) throws Exception {
+        File file = new File(dir, name);
+        JSONObject json = new JSONObject();
+        json.put("timestamp", String.valueOf(timestampMillis));
+        try (FileWriter writer = new FileWriter(file)) {
+            writer.write(json.toString());
+        }
+        return file;
+    }
+
+    @Test
+    public void testOnReceive_deletesOldFilesAndKeepsRecent() throws Exception {
+        // Mock Context
+        Context context = mock(Context.class);
+
+        // Use a temp directory to simulate ContentstackCache
+        File cacheDir = createTempDir();
+        when(context.getDir("ContentstackCache", 0)).thenReturn(cacheDir);
+
+        // current time (UTC aligned like ClearCache)
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeZone(TimeZone.getTimeZone("UTC"));
+        long nowMillis = cal.getTimeInMillis();
+
+        long twentyFiveHoursAgo = nowMillis - TimeUnit.HOURS.toMillis(25);
+        long oneHourAgo = nowMillis - TimeUnit.HOURS.toMillis(1);
+
+        // old file: should be deleted
+        File oldFile = writeCacheFile(cacheDir, "old_response.json", twentyFiveHoursAgo);
+
+        // recent file: should be kept
+        File recentFile = writeCacheFile(cacheDir, "recent_response.json", oneHourAgo);
+
+        // session and installation files: never deleted
+        File sessionFile = writeCacheFile(cacheDir, "Session", twentyFiveHoursAgo);
+        File installationFile = writeCacheFile(cacheDir, "Installation", twentyFiveHoursAgo);
+
+        ClearCache clearCache = new ClearCache();
+        clearCache.onReceive(context, new Intent("test.intent.CLEAR_CACHE"));
+
+        // Old file should be gone
+        assertFalse("Old cache file should be deleted", oldFile.exists());
+
+        // Recent file should still be there
+        assertTrue("Recent cache file should not be deleted", recentFile.exists());
+
+        // Session and Installation should not be deleted
+        assertTrue("Session file should not be deleted", sessionFile.exists());
+        assertTrue("Installation file should not be deleted", installationFile.exists());
+    }
+
+    @Test
+    public void testOnReceive_handlesEmptyDirectoryGracefully() {
+        Context context = mock(Context.class);
+
+        File cacheDir = createTempDir();
+        when(context.getDir("ContentstackCache", 0)).thenReturn(cacheDir);
+
+        // Ensure directory is empty
+        File[] existing = cacheDir.listFiles();
+        if (existing != null) {
+            for (File f : existing) {
+                //noinspection ResultOfMethodCallIgnored
+                f.delete();
+            }
+        }
+
+        ClearCache clearCache = new ClearCache();
+        clearCache.onReceive(context, new Intent("test.intent.CLEAR_CACHE"));
+
+        // No crash is success; directory should still exist
+        assertTrue(cacheDir.exists());
+    }
+}