[wpilib] Fix PowerDistribution.GetAllCurrents() (#6025)

wpilibj/src/test/java/edu/wpi/first/wpilibj/PowerDistributionTest.java

@@ -0,0 +1,29 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+package edu.wpi.first.wpilibj;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import edu.wpi.first.hal.HAL;
+import edu.wpi.first.wpilibj.PowerDistribution.ModuleType;
+import edu.wpi.first.wpilibj.simulation.PDPSim;
+import org.junit.jupiter.api.Test;
+
+class PowerDistributionTest {
+  @Test
+  void testGetAllCurrents() {
+    HAL.initialize(500, 0);
+    PowerDistribution pdp = new PowerDistribution(1, ModuleType.kRev);
+    PDPSim sim = new PDPSim(pdp);
+
+    for (int i = 0; i < pdp.getNumChannels(); i++) {
+      sim.setCurrent(i, 24 - i);
+    }
+    double[] currents = pdp.getAllCurrents();
+    for (int i = 0; i < pdp.getNumChannels(); i++) {
+      assertEquals(24 - i, currents[i]);
+    }
+  }
+}