added test for fcfs algo

tests/test_fcfs.py

@@ -0,0 +1,57 @@
+from src.fcfs import FCFSScheduler
+from src.process import Process
+
+def test_fcfs_scheduler_with_empty_input():
+    # Initialize the FCFS scheduler
+    scheduler = FCFSScheduler()
+
+    # Schedule with an empty list of processes
+    scheduling_output = scheduler.schedule([])
+
+    # Verify that the output indicates no processes to schedule
+    expected_output = "No processes to schedule"
+    assert scheduling_output == expected_output
+
+def test_fcfs_scheduler_with_processes_same_arrival_times():
+    # Create some sample processes with the same arrival time
+    processes = [
+        Process("P1", arrival_time=0, burst_time=5, priority=1),
+        Process("P2", arrival_time=0, burst_time=3, priority=2),
+        Process("P3", arrival_time=0, burst_time=7, priority=3)
+    ]
+
+    # Initialize the FCFS scheduler
+    scheduler = FCFSScheduler()
+
+    # Schedule the processes
+    scheduling_output = scheduler.schedule(processes)
+
+    # Verify the scheduling output
+    expected_output = """Process ID\tArrival Time\tBurst Time\tWaiting Time\tTurnaround Time\n\
+P1\t\t0\t\t5\t\t0\t\t5\n\
+P2\t\t0\t\t3\t\t5\t\t8\n\
+P3\t\t0\t\t7\t\t8\t\t15\n\
+\n\
+Average Waiting Time: 4.333333333333333\n\
+Average Turnaround Time: 9.333333333333334\n\
+"""
+    assert scheduling_output == expected_output
+
+def test_fcfs_scheduler_with_single_process():
+    # Create a single sample process
+    process = Process("P1", arrival_time=0, burst_time=5, priority=1)
+
+    # Initialize the FCFS scheduler
+    scheduler = FCFSScheduler()
+
+    # Schedule the single process
+    scheduling_output = scheduler.schedule([process])
+
+    # Verify the scheduling output
+    expected_output = """Process ID\tArrival Time\tBurst Time\tWaiting Time\tTurnaround Time\n\
+P1\t\t0\t\t5\t\t0\t\t5\n\
+\n\
+Average Waiting Time: 0.0\n\
+Average Turnaround Time: 5.0\n\
+"""
+    assert scheduling_output == expected_output