Test four-byte UTF-8.

Author: greenrobot-team

tests/objectbox-java-test/src/test/java/io/objectbox/Utf8HashIndexTest.java

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+package io.objectbox;
+
+import io.objectbox.annotation.IndexType;
+
+/**
+ * Same as {@link Utf8Test}, but with index on simpleString.
+ */
+public class Utf8HashIndexTest extends Utf8Test {
+
+    @Override
+    protected BoxStore createBoxStore() {
+        return createBoxStore(IndexType.HASH);
+    }
+
+}

tests/objectbox-java-test/src/test/java/io/objectbox/Utf8Test.java

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+package io.objectbox;
+
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * The Java VM does not recognize the four-byte format of standard UTF-8;
+ * it uses its own two-times-three-byte format instead. Test to ensure these
+ * supplementary characters (code points above U+FFFF) are properly supported.
+ */
+public class Utf8Test extends AbstractObjectBoxTest {
+
+    // U+1F600
+    private static final String TEST_STRING = "😁";
+
+    @Test
+    public void putGetAndQuery_works() {
+        // Put
+        TestEntity put = putTestEntity(TEST_STRING, 1);
+        putTestEntity("🚀", 2); // U+1F680
+        assertEquals(2, getTestEntityBox().count());
+
+        // Get
+        TestEntity get = getTestEntityBox().get(put.getId());
+        assertEquals(TEST_STRING, get.getSimpleString());
+
+        // Query String with equals
+        List<TestEntity> results = getTestEntityBox().query(
+                TestEntity_.simpleString.equal(TEST_STRING)
+        ).build().find();
+        assertEquals(1, results.size());
+        assertEquals(TEST_STRING, results.get(0).getSimpleString());
+
+        // Query String array
+        List<TestEntity> resultsArray = getTestEntityBox().query(
+                TestEntity_.simpleStringArray.containsElement(TEST_STRING)
+        ).build().find();
+        assertEquals(1, resultsArray.size());
+        assertEquals(TEST_STRING, resultsArray.get(0).getSimpleString());
+    }
+}

tests/objectbox-java-test/src/test/java/io/objectbox/Utf8ValueIndexTest.java

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+package io.objectbox;
+
+import io.objectbox.annotation.IndexType;
+
+/**
+ * Same as {@link Utf8Test}, but with index on simpleString.
+ */
+public class Utf8ValueIndexTest extends Utf8Test {
+
+    @Override
+    protected BoxStore createBoxStore() {
+        return createBoxStore(IndexType.VALUE);
+    }
+
+}