SCRIPT Move java files

wpilibj/src/test/java/org/wpilib/event/EventLoopTest.java

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+// 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.event;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.ConcurrentModificationException;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.junit.jupiter.api.Test;
+
+class EventLoopTest {
+  @Test
+  void testConditions() {
+    var counterTrue = new AtomicInteger(0);
+    var counterFalse = new AtomicInteger(0);
+    var loop = new EventLoop();
+    new BooleanEvent(loop, () -> true).ifHigh(counterTrue::incrementAndGet);
+    new BooleanEvent(loop, () -> false).ifHigh(counterFalse::incrementAndGet);
+
+    assertEquals(0, counterTrue.get());
+    assertEquals(0, counterFalse.get());
+
+    loop.poll();
+
+    assertEquals(1, counterTrue.get());
+    assertEquals(0, counterFalse.get());
+
+    loop.poll();
+
+    assertEquals(2, counterTrue.get());
+    assertEquals(0, counterFalse.get());
+  }
+
+  @Test
+  void testClear() {
+    var condition = new AtomicBoolean(false);
+    var counter = new AtomicInteger(0);
+    var loop = new EventLoop();
+
+    // first ensure binding works
+    new BooleanEvent(loop, condition::get).ifHigh(counter::incrementAndGet);
+
+    condition.set(false);
+    loop.poll();
+    assertEquals(0, counter.get());
+
+    condition.set(true);
+    loop.poll();
+    assertEquals(1, counter.get());
+
+    // clear bindings
+    loop.clear();
+
+    condition.set(true);
+    loop.poll();
+    // shouldn't change
+    assertEquals(1, counter.get());
+  }
+
+  @Test
+  void testConcurrentModification() {
+    var loop = new EventLoop();
+
+    loop.bind(
+        () -> {
+          assertThrows(
+              ConcurrentModificationException.class,
+              () -> {
+                loop.bind(() -> {});
+              });
+        });
+
+    loop.poll();
+
+    loop.clear();
+
+    loop.bind(
+        () -> {
+          assertThrows(
+              ConcurrentModificationException.class,
+              () -> {
+                loop.clear();
+              });
+        });
+
+    loop.poll();
+  }
+}