### Question:
ImmutableElectricObject { public int getNumVariables() { return vars.length; } ImmutableElectricObject(Variable[] vars, int flags); Variable getVar(Variable.Key key); T getVarValue(Variable.Key key, Class type); Iterator<Variable> getVariables(); Variable[] toVariableArray(); int getNumVariables(); Variable getVar(int varIndex); int searchVar(Variable.Key key); abstract int hashCodeExceptVariables(); abstract boolean equalsExceptVariables(ImmutableElectricObject o); boolean equalsVariables(ImmutableElectricObject o); final int flags; }### Answer:
@Test public void testGetNumVariables() { System.out.println("getNumVariables"); assertEquals(0, obj0.getNumVariables()); assertEquals(1, obj_a.getNumVariables()); assertEquals(2, obj_Aa.getNumVariables()); }