Add ProportionalFairScheduling algorithm (#5812)

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

@@ -0,0 +1,53 @@
+package com.thealgorithms.scheduling;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.List;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class ProportionalFairSchedulingTest {
+
+    private ProportionalFairScheduling scheduler;
+
+    @BeforeEach
+    public void setup() {
+        scheduler = new ProportionalFairScheduling();
+    }
+
+    @Test
+    public void testAllocateResourcesSingleProcess() {
+        scheduler.addProcess("Process1", 5);
+        scheduler.allocateResources(100);
+        List<String> expected = List.of("Process1: 100");
+        assertEquals(expected, scheduler.getAllocatedResources());
+    }
+
+    @Test
+    public void testAllocateResourcesMultipleProcesses() {
+        scheduler.addProcess("Process1", 2);
+        scheduler.addProcess("Process2", 3);
+        scheduler.addProcess("Process3", 5);
+        scheduler.allocateResources(100);
+        List<String> expected = List.of("Process1: 20", "Process2: 30", "Process3: 50");
+        assertEquals(expected, scheduler.getAllocatedResources());
+    }
+
+    @Test
+    public void testAllocateResourcesZeroWeightProcess() {
+        scheduler.addProcess("Process1", 0);
+        scheduler.addProcess("Process2", 5);
+        scheduler.allocateResources(100);
+        List<String> expected = List.of("Process1: 0", "Process2: 100");
+        assertEquals(expected, scheduler.getAllocatedResources());
+    }
+
+    @Test
+    public void testAllocateResourcesEqualWeights() {
+        scheduler.addProcess("Process1", 1);
+        scheduler.addProcess("Process2", 1);
+        scheduler.allocateResources(100);
+        List<String> expected = List.of("Process1: 50", "Process2: 50");
+        assertEquals(expected, scheduler.getAllocatedResources());
+    }
+}