Add integration test. Run with ./gradlew runIntegrationTest

src/integration-test/java/com/replaymod/replay/ExitReplay.java

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+package com.replaymod.replay;
+
+import com.replaymod.core.AbstractTask;
+import net.minecraft.client.gui.GuiIngameMenu;
+import net.minecraft.client.gui.GuiMainMenu;
+
+public class ExitReplay extends AbstractTask {
+    @Override
+    protected void init() {
+        mc.displayInGameMenu();
+        expectGui(GuiIngameMenu.class, ingameMenu -> {
+            click("Exit Replay");
+            expectGui(GuiMainMenu.class, mainMenu -> future.set(null));
+        });
+    }
+}

src/integration-test/java/com/replaymod/replay/LoadReplay.java

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+package com.replaymod.replay;
+
+import com.replaymod.core.AbstractTask;
+import com.replaymod.replay.gui.screen.GuiReplayViewer;
+import de.johni0702.minecraft.gui.function.Clickable;
+import net.minecraftforge.client.event.RenderGameOverlayEvent;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import org.lwjgl.util.Point;
+import org.lwjgl.util.ReadableDimension;
+
+public class LoadReplay extends AbstractTask {
+    @Override
+    protected void init() {
+        expectGui(GuiReplayViewer.class, replayViewer -> runLater(() -> {
+            ReadableDimension size = replayViewer.getMaxSize();
+            // Select first entry
+            replayViewer.forEach(Clickable.class).mouseClick(new Point(size.getWidth() / 2, 40), 0);
+            // Load first replay
+            click(replayViewer.loadButton);
+
+            class EventHandler {
+                @SubscribeEvent
+                public void onRenderIngame(RenderGameOverlayEvent.Pre event) {
+                    MinecraftForge.EVENT_BUS.unregister(this);
+                    runLater(() -> future.set(null));
+                }
+            }
+            MinecraftForge.EVENT_BUS.register(new EventHandler());
+        }));
+    }
+}

src/integration-test/java/com/replaymod/replay/OpenReplayViewer.java

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+package com.replaymod.replay;
+
+import com.replaymod.core.AbstractTask;
+import com.replaymod.replay.gui.screen.GuiReplayViewer;
+import net.minecraft.client.gui.GuiMainMenu;
+
+public class OpenReplayViewer extends AbstractTask {
+    @Override
+    protected void init() {
+        expectGui(GuiMainMenu.class, mainMenu -> {
+            click("Replay Viewer");
+            expectGui(GuiReplayViewer.class, replayViewer -> future.set(null));
+        });
+    }
+}

src/integration-test/java/com/replaymod/replay/SpectatePlayer.java

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+package com.replaymod.replay;
+
+import com.replaymod.core.AbstractTask;
+import com.replaymod.extras.playeroverview.PlayerOverviewGui;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import net.minecraftforge.fml.common.gameevent.TickEvent;
+import org.lwjgl.input.Keyboard;
+
+import java.util.concurrent.TimeoutException;
+
+public class SpectatePlayer extends AbstractTask {
+    @Override
+    protected void init() {
+        press(Keyboard.KEY_B);
+        expectGui(PlayerOverviewGui.class, overview -> {
+            click(overview.getMaxSize().getWidth() / 2 - 60, 60);
+            press(Keyboard.KEY_ESCAPE);
+            expectGuiClosed(() -> future.set(null));
+        });
+    }
+
+    public static class End extends AbstractTask {
+        private int timeout;
+
+        @Override
+        protected void init() {
+            runLater(() -> press(Keyboard.KEY_LSHIFT));
+        }
+
+        @SubscribeEvent
+        public void onTick(TickEvent.RenderTickEvent event) {
+            if (event.phase != TickEvent.Phase.START) return;
+            if (timeout++ > 20) {
+                future.setException(new TimeoutException("Camera hasn't stopped spectating."));
+                return;
+            }
+            if (mc.getRenderViewEntity() == mc.thePlayer) {
+                future.set(null);
+            }
+        }
+    }
+}

src/integration-test/java/com/replaymod/replay/overlay/OverlayGui.java

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+package com.replaymod.replay.overlay;
+
+import com.replaymod.core.AbstractTask;
+import com.replaymod.core.CompositeTask;
+import com.replaymod.core.Task;
+import com.replaymod.replay.gui.overlay.GuiReplayOverlay;
+import org.lwjgl.input.Keyboard;
+
+public class OverlayGui {
+    public static Task whileOpened(Task...tasks) {
+        Task[] nTasks = new Task[tasks.length + 2];
+        System.arraycopy(tasks, 0, nTasks, 1, tasks.length);
+        nTasks[0] = new Open();
+        nTasks[tasks.length + 1] = new Close();
+        return new CompositeTask(nTasks);
+    }
+
+    public static class Open extends AbstractTask {
+        @Override
+        protected void init() {
+            press(Keyboard.KEY_T);
+            expectGui(GuiReplayOverlay.class, done -> future.set(null));
+        }
+    }
+
+    public static class Close extends AbstractTask {
+        @Override
+        protected void init() {
+            press(Keyboard.KEY_ESCAPE);
+            expectGuiClosed(() -> future.set(null));
+        }
+    }
+}