Java Reference
In-Depth Information
public void simulate( int numSteps){
int step;
for (step # 0; step<numSteps && !cpu.halted(); !! step){
The test of this prototype has to check the behaviour of the components of
the computer. The RAM can be tested for the initialization and for the inter-
action with the CPU through the bus. The CPU can be tested by executing
the simulation. In particular the CPU behaviour is correct if:
the CPU terminates the program in a finite time;
the memory contains the correct result of the operations.
The termination is an important test since it ensures that the system
has not entered some deadlock, i.e. for bad synchronization among the
elements. It can be tested checking the halted() method.
The correct result in the RAM ensures that the information has been
correctly transferred between the components and that it has been correctly
computed. It can be checked comparing the RAM at the end of the simu-
lation with the expected memory contents.
The test case TestComputer performs these basic tests.
public class TestComputer extends TestCase {
private void compareMemory(RAM ram, String[] expected){
for ( int i # 0; i<expected.length; !! i)
public void testMemoryInitialization() {
String initialMemory[] # {"123","432","555"};
Computer computer # new Computer(initialMemory);
public void testExecution() {
String initialMemory[] # {"123","432","0"};
Computer computer # new Computer(initialMemory);
assertTrue("CPU not halted",computer.cpu.halted());
String expectedMemory[] # {"123","432","555"};
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