Add Round Robin scheduling (#4184)

src/test/java/com/thealgorithms/scheduling/RRSchedulingTest.java

@@ -0,0 +1,65 @@
+package com.thealgorithms.scheduling;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.thealgorithms.devutils.entities.ProcessDetails;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+class RRSchedulingTest {
+    @Test
+    public void testingProcesses() {
+        List<ProcessDetails> processes = addProcessesForRR();
+        final RRScheduling rrScheduling = new RRScheduling(processes, 4); // for sending to RR with quantum value 4
+
+        rrScheduling.scheduleProcesses();
+
+        assertEquals(6, processes.size());
+
+        assertEquals("P1", processes.get(0).getProcessId());
+        assertEquals(12, processes.get(0).getWaitingTime());
+        assertEquals(17, processes.get(0).getTurnAroundTimeTime());
+
+        assertEquals("P2", processes.get(1).getProcessId());
+        assertEquals(16, processes.get(1).getWaitingTime());
+        assertEquals(22, processes.get(1).getTurnAroundTimeTime());
+
+        assertEquals("P3", processes.get(2).getProcessId());
+        assertEquals(6, processes.get(2).getWaitingTime());
+        assertEquals(9, processes.get(2).getTurnAroundTimeTime());
+
+        assertEquals("P4", processes.get(3).getProcessId());
+        assertEquals(8, processes.get(3).getWaitingTime());
+        assertEquals(9, processes.get(3).getTurnAroundTimeTime());
+
+        assertEquals("P5", processes.get(4).getProcessId());
+        assertEquals(15, processes.get(4).getWaitingTime());
+        assertEquals(20, processes.get(4).getTurnAroundTimeTime());
+
+        assertEquals("P6", processes.get(5).getProcessId());
+        assertEquals(11, processes.get(5).getWaitingTime());
+        assertEquals(15, processes.get(5).getTurnAroundTimeTime());
+
+    }
+
+    private List<ProcessDetails> addProcessesForRR() {
+        final ProcessDetails process1 = new ProcessDetails("P1", 0, 5);
+        final ProcessDetails process2 = new ProcessDetails("P2", 1, 6);
+        final ProcessDetails process3 = new ProcessDetails("P3", 2, 3);
+        final ProcessDetails process4 = new ProcessDetails("P4", 3, 1);
+        final ProcessDetails process5 = new ProcessDetails("P5", 4, 5);
+        final ProcessDetails process6 = new ProcessDetails("P6", 6, 4);
+
+        final List<ProcessDetails> processDetails = new ArrayList<>();
+        processDetails.add(process1);
+        processDetails.add(process2);
+        processDetails.add(process3);
+        processDetails.add(process4);
+        processDetails.add(process5);
+        processDetails.add(process6);
+
+        return processDetails;
+    }
+}