### Question:
CodeExpression implements Serializable { @Override public String toString() { return expr; } private  CodeExpression(String expr, Code code); static synchronized CodeExpression valueOf(String expression, Code code); Code getCode(); boolean isJava(); String getExpr(); Set<Variable.Key> dependsOn(); EvalSpice.ParseException getParseException(); String getSpiceText(); String getHSpiceText(boolean inPar); String getVerilogText(); Object eval(); @Override int hashCode(); @Override boolean equals(Object o); @Override String toString(); void write(IdWriter writer); static CodeExpression read(IdReader reader); static void printStatistics(boolean verbose);  }### Answer:
@Test public void testCodeToString() { System.out.println("toString"); CodeExpression.Code instance = CodeExpression.Code.NONE; String expResult = "Not Code"; String result = instance.toString(); assertEquals(expResult, result); }
@Test public void testToString() { System.out.println("toString"); assertEquals("@a", CodeExpression.valueOf("@a", CodeExpression.Code.JAVA).toString()); assertEquals("@a", CodeExpression.valueOf("@a", CodeExpression.Code.SPICE).toString()); assertEquals("@a", CodeExpression.valueOf("@a", CodeExpression.Code.TCL).toString()); }