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package myhw3.command;
import static org.junit.Assert.*;
import org.junit.Test;
public class CommandHistoryTEST {
@Test
public void testEmptyExceptions() {
CommandHistoryObj h = new CommandHistoryObj();
assertSame(null, h.topUndoCommand());
assertSame(null, h.topRedoCommand());
assertFalse(h.undo());
assertFalse(h.redo());
}
private void checkStacks(CommandHistoryObj h, Command topUndo, Command topRedo) {
assertSame(topUndo, h.topUndoCommand());
assertSame(topRedo, h.topRedoCommand());
}
@Test
public void topIsSetByAddUndoAndRedo() {
CommandHistoryObj h = new CommandHistoryObj();
class CmdSuccess implements Command {
public boolean run() { return true; }
public void undo() { }
public void redo() { }
}
Command x1 = new CmdSuccess();
Command x2 = new CmdSuccess();
Command x3 = new CmdSuccess();
h.add(x1); checkStacks(h, x1, null);
h.undo(); checkStacks(h, null, x1);
h.redo(); checkStacks(h, x1, null);
h.add(x2); checkStacks(h, x2, null);
h.undo(); checkStacks(h, x1, x2);
h.undo(); checkStacks(h, null, x1);
h.redo(); checkStacks(h, x1, x2);
h.redo(); checkStacks(h, x2, null);
h.undo(); checkStacks(h, x1, x2);
h.add(x3); checkStacks(h, x3, null);
h.undo(); checkStacks(h, x1, x3);
h.undo(); checkStacks(h, null, x1);
h.redo(); checkStacks(h, x1, x3);
h.redo(); checkStacks(h, x3, null);
h = new CommandHistoryObj();
h.add(x1); checkStacks(h, x1, null);
h.add(x2); checkStacks(h, x2, null);
h.undo(); checkStacks(h, x1, x2);
h.redo(); checkStacks(h, x2, null);
h.add(x3); checkStacks(h, x3, null);
h.undo(); checkStacks(h, x2, x3);
h.undo(); checkStacks(h, x1, x2);
}
// these must be fields so that they can be changed by the instances
// of the inner class TestThatMethodsArePerformed.
private boolean didRun;
private boolean didUndo;
private boolean didRedo;
@Test
public void methodsArePerformed() {
CommandHistoryObj h = new CommandHistoryObj();
class MockCommand implements Command {
// Using "CommandHistoryTEST.this" to make references to
// outer class instance explicit
public boolean run() {
CommandHistoryTEST.this.didRun = true;
return true;
}
public void undo() {
CommandHistoryTEST.this.didUndo = true;
}
public void redo() {
CommandHistoryTEST.this.didRedo = true;
}
}
Command x = new MockCommand();
didRun = didUndo = didRedo = false;
h.add(x);
assertTrue(!didRun && !didUndo && !didRedo);
didRun = didUndo = didRedo = false;
h.undo();
assertTrue(!didRun && didUndo && !didRedo);
didRun = didUndo = didRedo = false;
h.redo();
assertTrue(!didRun && !didUndo && didRedo);
}
}
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