### Question:
ClientIn extends ClientOperator<ClientIn> { @Override public String toString() { final boolean hasOperands = operands != null && !operands.isEmpty(); String lhs = hasOperands && operands.get(0) != null ? operands.get(0).toString() : ClientExpressions.MISSING_REPRESENTATION; String rhs = hasOperands && operands.size() > 1 && operands.get(1) != null ? operands.get(1).toString() : ClientExpressions.MISSING_REPRESENTATION; if(hasParen()) return "("+lhs + " " + this.getOperator().getDomelOperator() + " " + rhs+ ")"; return lhs + " " + this.getOperator().getDomelOperator() + " " + rhs; } ClientIn();  ClientIn(ClientVariable variable, List<ClientExpression> list);  ClientIn(ClientVariable variable, ClientRange range);  ClientIn(ClientVariable variable, ClientList list);  ClientIn(ClientVariable variable, ClientVariable inVariable);  ClientIn(ClientExpression lhs, ClientExpression rhs);  ClientIn(ClientIn source); @XmlTransient ClientExpression getLhs(); @InstanceOf(value = {ClientRange.class, ClientList.class, ClientVariable.class}, message = "The second operand of an In expression may only be a 'list', 'range' or 'variable'", errorCode = "domel.in.rhs.type.invalid") @XmlTransient ClientExpression getRhs(); @Override @Size(min = 2, max = 2, message = DOMEL_INCORRECT_OPERANDS_COUNT) List<ClientExpression> getOperands(); @Override String toString(); @Override void accept(ClientELVisitor visitor); @Override ClientIn deepClone(); int getPrecedence(); static final String EXPRESSION_ID; }### Answer:
@Test public void toStringInstanceWithVariableAndList() { ClientIn instance = new ClientIn(TEST_CLIENT_VARIABLE, TEST_CLIENT_TWO_VARIABLES); assertEquals(TEST_VARIABLE_NAME + " in (" + TEST_VARIABLE_NAME + ", " + TEST_VARIABLE_NAME_1 + ")", instance.toString()); }
@Test public void toStringInstanceWithVariableAndRange() { ClientIn instance = new ClientIn(TEST_CLIENT_VARIABLE, TEST_CLIENT_RANGE); assertEquals(TEST_VARIABLE_NAME + " in (" + TEST_VARIABLE_NAME + ":" + TEST_VARIABLE_NAME_1 + ")", instance.toString()); }
@Test public void toStringInstanceWithVariableAndClientList() { ClientIn instance = new ClientIn(TEST_CLIENT_VARIABLE, TEST_CLIENT_LIST); assertEquals(TEST_VARIABLE_NAME + " in (" + TEST_VARIABLE_NAME + ", " + TEST_VARIABLE_NAME_1 + ")", instance.toString()); }
@Test public void toStringInstanceWithTwoVariables() { ClientIn instance = new ClientIn(TEST_CLIENT_VARIABLE, TEST_CLIENT_VARIABLE_1); assertEquals(TEST_VARIABLE_NAME + " in " + TEST_VARIABLE_NAME_1, instance.toString()); }