test: add document replication test

android/CouchbaseLite/src/androidTest/java/com/couchbase/lite/DocumentReplicationTest.java

@@ -0,0 +1,21 @@
+package com.couchbase.lite;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class DocumentReplicationTest extends BaseReplicatorTest {
+
+    @Test
+    public void testDocumentReplication() {
+        boolean isPush = true;
+        List<ReplicatedDocument> docs = new ArrayList<>();
+        DocumentReplication doc = new DocumentReplication(repl, isPush, docs);
+        assertEquals(doc.isPush(), isPush);
+        assertEquals(doc.getReplicator(), repl);
+        assertEquals(doc.getDocuments(), docs);
+    }
+}