### Question:
URepeated extends UExpression { public static URepeated create(CharSequence identifier, UExpression expression) { return new AutoValue_URepeated(identifier.toString(), expression); }  static URepeated create(CharSequence identifier, UExpression expression); @Override JCExpression inline(Inliner inliner); @Override R accept(TreeVisitor<R, D> visitor, D data); @Override Kind getKind(); JCExpression getUnderlyingBinding(Unifier unifier); Key key();  }### Answer:
@Test public void unifies() { JCExpression expr = parseExpression("\"abcdefg\".charAt(x + 1)"); URepeated ident = URepeated.create("foo", UFreeIdent.create("foo")); assertThat(ident.unify(expr, unifier)).isNotNull(); assertThat(unifier.getBindings()).containsExactly(new UFreeIdent.Key("foo"), expr); }
@Test public void equality() { new EqualsTester() .addEqualityGroup(URepeated.create("foo", UFreeIdent.create("foo"))) .addEqualityGroup(URepeated.create("bar", UFreeIdent.create("bar"))) .testEquals(); }
@Test public void serialization() { SerializableTester.reserializeAndAssert(URepeated.create("foo", UFreeIdent.create("foo"))); }