@Test
public void unusedAssignments() {
Program program = new SimpleProgramBuilder().emitWrite("x").buildProgram();
Assert.assertEquals(
Collections.singleton((WriteInstruction) program.get(0)), program.getUnusedAssignments());
}
@Test
public void writeWithReadIsNotUnusedAssignment() {
Program program = new SimpleProgramBuilder().emitWrite("x").emitRead("x").buildProgram();
Assert.assertTrue(program.getUnusedAssignments().isEmpty());
}