Add support for setting an optional last name in profiles.

app/src/test/java/org/thoughtcrime/securesms/util/cjkv/CJKVUtilTest.java

@@ -0,0 +1,65 @@
+package org.thoughtcrime.securesms.util.cjkv;
+
+import android.app.Application;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+
+import static org.junit.Assert.*;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(manifest = Config.NONE, application = Application.class)
+public class CJKVUtilTest {
+
+  private static final String CJKV_CHARS    = "统码";
+  private static final String NON_CJKV_CHAR = "a";
+  private static final String MIXED_CHARS   = CJKV_CHARS + NON_CJKV_CHAR;
+
+  @Test
+  public void givenAllCJKVChars_whenIsCJKV_thenIExpectTrue() {
+    // WHEN
+    boolean result = CJKVUtil.isCJKV(CJKV_CHARS);
+
+    //THEN
+    assertTrue(result);
+  }
+
+  @Test
+  public void givenNoCJKVChars_whenIsCJKV_thenIExpectFalse() {
+    // WHEN
+    boolean result = CJKVUtil.isCJKV(NON_CJKV_CHAR);
+
+    // THEN
+    assertFalse(result);
+  }
+
+  @Test
+  public void givenOneNonCJKVChar_whenIsCJKV_thenIExpectFalse() {
+    // WHEN
+    boolean result = CJKVUtil.isCJKV(MIXED_CHARS);
+
+    // THEN
+    assertFalse(result);
+  }
+
+  @Test
+  public void givenAnEmptyString_whenIsCJKV_thenIExpectTrue() {
+    // WHEN
+    boolean result = CJKVUtil.isCJKV("");
+
+    // THEN
+    assertTrue(result);
+  }
+
+  @Test
+  public void givenNull_whenIsCJKV_thenIExpectTrue() {
+    // WHEN
+    boolean result = CJKVUtil.isCJKV(null);
+
+    // THEN
+    assertTrue(result);
+  }
+
+}