Move our test thread scheduler into the main jar

While useless in-game, both CCEmuX and eval.tweaked.cc ended up
reimplementing it, so might as well expose it!

src/main/java/dan200/computercraft/core/computer/mainthread/NoWorkMainThreadScheduler.java

@@ -3,9 +3,8 @@
  * Copyright Daniel Ratcliffe, 2011-2022. Do not distribute without permission.
  * Send enquiries to dratcliffe@gmail.com
  */
-package dan200.computercraft.test.core.computer;
+package dan200.computercraft.core.computer.mainthread;
 
-import dan200.computercraft.core.computer.mainthread.MainThreadScheduler;
 import dan200.computercraft.core.metrics.MetricsObserver;
 
 import javax.annotation.Nonnull;
@@ -13,8 +12,10 @@ import java.util.concurrent.TimeUnit;
 
 /**
  * A {@link MainThreadScheduler} which fails when a computer tries to enqueue work.
+ * <p>
+ * This is useful for emulators, where we'll never make any main thread calls.
  */
-public class FakeMainThreadScheduler implements MainThreadScheduler
+public class NoWorkMainThreadScheduler implements MainThreadScheduler
 {
     @Override
     public Executor createExecutor( MetricsObserver observer )

src/test/java/dan200/computercraft/core/ComputerTestDelegate.java

@@ -13,12 +13,12 @@ import dan200.computercraft.api.lua.LuaFunction;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.core.computer.Computer;
 import dan200.computercraft.core.computer.ComputerSide;
+import dan200.computercraft.core.computer.mainthread.NoWorkMainThreadScheduler;
 import dan200.computercraft.core.filesystem.FileMount;
 import dan200.computercraft.core.filesystem.FileSystemException;
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.support.TestFiles;
 import dan200.computercraft.test.core.computer.BasicEnvironment;
-import dan200.computercraft.test.core.computer.FakeMainThreadScheduler;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.junit.jupiter.api.*;
@@ -111,7 +111,7 @@ public class ComputerTestDelegate
         }
 
         BasicEnvironment environment = new BasicEnvironment( mount );
-        context = new ComputerContext( environment, 1, new FakeMainThreadScheduler() );
+        context = new ComputerContext( environment, 1, new NoWorkMainThreadScheduler() );
         computer = new Computer( context, environment, term, 0 );
         computer.getEnvironment().setPeripheral( ComputerSide.TOP, new FakeModem() );
         computer.getEnvironment().setPeripheral( ComputerSide.BOTTOM, new FakePeripheralHub() );

src/test/java/dan200/computercraft/shared/network/server/UploadFileMessageTest.java

@@ -7,9 +7,9 @@ package dan200.computercraft.shared.network.server;
 
 import dan200.computercraft.shared.computer.upload.FileSlice;
 import dan200.computercraft.shared.computer.upload.FileUpload;
-import dan200.computercraft.test.core.ArbitraryByteBuffer;
 import dan200.computercraft.support.FakeContainer;
 import dan200.computercraft.support.WithMinecraft;
+import dan200.computercraft.test.core.ArbitraryByteBuffer;
 import io.netty.buffer.Unpooled;
 import net.jqwik.api.*;
 import net.minecraft.network.FriendlyByteBuf;

src/testFixtures/kotlin/dan200/computercraft/test/core/computer/KotlinComputerManager.kt

@@ -10,6 +10,7 @@ import dan200.computercraft.core.ComputerContext
 import dan200.computercraft.core.computer.Computer
 import dan200.computercraft.core.computer.ComputerThread
 import dan200.computercraft.core.computer.TimeoutState
+import dan200.computercraft.core.computer.mainthread.NoWorkMainThreadScheduler
 import dan200.computercraft.core.lua.MachineEnvironment
 import dan200.computercraft.core.lua.MachineResult
 import dan200.computercraft.core.terminal.Terminal
@@ -27,7 +28,7 @@ typealias FakeComputerTask = (state: TimeoutState) -> MachineResult
 class KotlinComputerManager : AutoCloseable {
 
     private val machines: MutableMap<Computer, Queue<FakeComputerTask>> = HashMap()
-    private val context = ComputerContext(BasicEnvironment(), ComputerThread(1), FakeMainThreadScheduler()) { DummyLuaMachine(it) }
+    private val context = ComputerContext(BasicEnvironment(), ComputerThread(1), NoWorkMainThreadScheduler()) { DummyLuaMachine(it) }
     private val errorLock: Lock = ReentrantLock()
     private val hasError = errorLock.newCondition()