Initial commit: Heapsort and Priority Queue Implementation
- Implemented complete Heapsort algorithm with max-heap operations - Implemented binary heap-based Priority Queue with all core operations - Created Task class for task scheduling applications - Implemented Task Scheduler simulation using priority queue - Added comprehensive test suite (70+ tests, all passing) - Implemented sorting algorithm comparison utilities (Heapsort vs Quicksort vs Merge Sort) - Added detailed README with comprehensive analysis and documentation - Included demonstration scripts for all features - Generated performance comparison plots - Modular, well-documented code following academic standards Author: Carlos Gutierrez Email: cgutierrez44833@ucumberlands.edu
This commit is contained in:
Carlos Gutierrez
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tests/test_scheduler.py
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190
tests/test_scheduler.py
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"""
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Test Suite for Task Scheduler Implementation
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This module contains comprehensive tests for the task scheduler,
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including scheduling algorithms, statistics, and edge cases.
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Author: Carlos Gutierrez
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Email: cgutierrez44833@ucumberlands.edu
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"""
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import unittest
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import sys
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import os
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# Add parent directory to path to import src modules
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sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
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from src.scheduler import TaskScheduler, SchedulingResult, SchedulingStatistics, simulate_scheduler
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from src.task import Task
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class TestTaskScheduler(unittest.TestCase):
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"""Test cases for TaskScheduler class."""
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def setUp(self):
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"""Set up test fixtures."""
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self.scheduler = TaskScheduler()
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def test_basic_scheduling(self):
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"""Test basic priority-based scheduling."""
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tasks = [
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Task("T1", priority=10, arrival_time=0.0, execution_time=5.0),
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Task("T2", priority=20, arrival_time=0.0, execution_time=3.0),
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Task("T3", priority=15, arrival_time=0.0, execution_time=4.0),
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]
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results = self.scheduler.schedule_tasks(tasks)
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self.assertEqual(len(results), 3)
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# Highest priority should execute first
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self.assertEqual(results[0].task_id, "T2")
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self.assertEqual(results[1].task_id, "T3")
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self.assertEqual(results[2].task_id, "T1")
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def test_scheduling_order(self):
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"""Test that tasks are scheduled in priority order."""
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tasks = [
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Task("T1", priority=5, arrival_time=0.0, execution_time=1.0),
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Task("T2", priority=10, arrival_time=0.0, execution_time=1.0),
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Task("T3", priority=15, arrival_time=0.0, execution_time=1.0),
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]
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results = self.scheduler.schedule_tasks(tasks)
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# Should be in descending priority order
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priorities = [t.priority for t in tasks]
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priorities.sort(reverse=True)
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for i, result in enumerate(results):
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# Find the task that matches this result
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task = next(t for t in tasks if t.task_id == result.task_id)
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self.assertEqual(task.priority, priorities[i])
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def test_deadline_tracking(self):
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"""Test that deadlines are correctly tracked."""
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tasks = [
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Task("T1", priority=20, arrival_time=0.0, deadline=10.0, execution_time=5.0),
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Task("T2", priority=10, arrival_time=0.0, deadline=100.0, execution_time=20.0),
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]
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results = self.scheduler.schedule_tasks(tasks)
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# T1 should meet deadline (starts at 0, completes at 5, deadline 10)
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self.assertTrue(results[0].deadline_met)
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# T2 should also meet deadline (starts at 5, completes at 25, deadline 100)
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self.assertTrue(results[1].deadline_met)
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def test_deadline_missed(self):
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"""Test detection of missed deadlines."""
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tasks = [
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Task("T1", priority=20, arrival_time=0.0, deadline=3.0, execution_time=5.0),
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]
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results = self.scheduler.schedule_tasks(tasks)
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# Task should miss deadline (completes at 5, deadline is 3)
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self.assertFalse(results[0].deadline_met)
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def test_wait_time_calculation(self):
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"""Test wait time calculation."""
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tasks = [
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Task("T1", priority=20, arrival_time=0.0, execution_time=5.0),
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Task("T2", priority=10, arrival_time=0.0, execution_time=3.0),
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]
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results = self.scheduler.schedule_tasks(tasks)
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# T1 should have no wait time (executes first)
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self.assertEqual(results[0].wait_time, 0.0)
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# T2 should wait for T1 to complete
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self.assertEqual(results[1].wait_time, 5.0)
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def test_empty_task_list(self):
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"""Test scheduling with empty task list."""
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results = self.scheduler.schedule_tasks([])
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self.assertEqual(len(results), 0)
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def test_single_task(self):
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"""Test scheduling a single task."""
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tasks = [Task("T1", priority=10, arrival_time=0.0, execution_time=5.0)]
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results = self.scheduler.schedule_tasks(tasks)
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self.assertEqual(len(results), 1)
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self.assertEqual(results[0].task_id, "T1")
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self.assertEqual(results[0].start_time, 0.0)
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self.assertEqual(results[0].completion_time, 5.0)
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self.assertEqual(results[0].wait_time, 0.0)
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class TestSchedulingStatistics(unittest.TestCase):
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"""Test cases for scheduling statistics."""
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def test_statistics_calculation(self):
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"""Test statistics calculation."""
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scheduler = TaskScheduler()
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tasks = [
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Task("T1", priority=20, arrival_time=0.0, deadline=10.0, execution_time=5.0),
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Task("T2", priority=10, arrival_time=0.0, deadline=100.0, execution_time=3.0),
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]
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results = scheduler.schedule_tasks(tasks)
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stats = scheduler.get_statistics(results)
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self.assertEqual(stats.total_tasks, 2)
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self.assertEqual(stats.completed_tasks, 2)
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self.assertEqual(stats.deadline_met, 2)
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self.assertEqual(stats.deadline_missed, 0)
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self.assertEqual(stats.total_execution_time, 8.0) # 5 + 3
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self.assertGreater(stats.average_wait_time, 0)
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self.assertGreater(stats.throughput, 0)
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def test_statistics_with_missed_deadlines(self):
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"""Test statistics with missed deadlines."""
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scheduler = TaskScheduler()
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tasks = [
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Task("T1", priority=20, arrival_time=0.0, deadline=3.0, execution_time=5.0),
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Task("T2", priority=10, arrival_time=0.0, deadline=100.0, execution_time=3.0),
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]
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results = scheduler.schedule_tasks(tasks)
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stats = scheduler.get_statistics(results)
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self.assertEqual(stats.deadline_met, 1)
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self.assertEqual(stats.deadline_missed, 1)
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def test_statistics_empty_results(self):
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"""Test statistics with empty results."""
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scheduler = TaskScheduler()
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stats = scheduler.get_statistics([])
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self.assertEqual(stats.total_tasks, 0)
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self.assertEqual(stats.completed_tasks, 0)
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self.assertEqual(stats.total_execution_time, 0.0)
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self.assertEqual(stats.average_wait_time, 0.0)
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self.assertEqual(stats.throughput, 0.0)
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class TestSimulateScheduler(unittest.TestCase):
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"""Test cases for simulate_scheduler convenience function."""
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def test_simulate_scheduler(self):
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"""Test the simulate_scheduler function."""
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tasks = [
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Task("T1", priority=20, arrival_time=0.0, execution_time=5.0),
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Task("T2", priority=10, arrival_time=0.0, execution_time=3.0),
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]
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stats = simulate_scheduler(tasks, verbose=False)
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self.assertEqual(stats.total_tasks, 2)
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self.assertEqual(stats.completed_tasks, 2)
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if __name__ == '__main__':
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unittest.main()
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