diff --git a/src/controllers/controller.h b/src/controllers/controller.h
index 5df89a0f1206..b0b9e2cc7320 100644
--- a/src/controllers/controller.h
+++ b/src/controllers/controller.h
@@ -188,7 +188,7 @@ class ControllerJSProxy: public QObject {
 
     // The length parameter is here for backwards compatibility for when scripts
     // were required to specify it.
-    Q_INVOKABLE void send(QList<int> data, unsigned int length = 0) {
+    Q_INVOKABLE virtual void send(QList<int> data, unsigned int length = 0) {
         Q_UNUSED(length);
         m_pController->send(data, data.length());
     }
diff --git a/src/controllers/engine/controllerengine.cpp b/src/controllers/engine/controllerengine.cpp
index f06efbb847a5..ca699d95363d 100644
--- a/src/controllers/engine/controllerengine.cpp
+++ b/src/controllers/engine/controllerengine.cpp
@@ -33,7 +33,8 @@ const double kAlphaBetaDt = kScratchTimerMs / 1000.0;
 ControllerEngine::ControllerEngine(Controller* controller)
         : m_bDisplayingExceptionDialog(false),
           m_pScriptEngine(nullptr),
-          m_pController(controller) {
+          m_pController(controller),
+          m_bTesting(false) {
     // Handle error dialog buttons
     qRegisterMetaType<QMessageBox::StandardButton>("QMessageBox::StandardButton");
 
@@ -615,9 +616,13 @@ QJSValue ControllerEngine::makeConnection(QString group, QString name,
 
     ControlObjectScript* coScript = getControlObjectScript(group, name);
     if (coScript == nullptr) {
-        throwJSError("ControllerEngine: script tried to connect to ControlObject (" +
-                group + ", " + name +
-                ") which is non-existent.");
+        // The test setups do not run all of Mixxx, so ControlObjects not
+        // existing during tests is okay.
+        if (!m_bTesting) {
+            throwJSError("ControllerEngine: script tried to connect to ControlObject (" +
+                    group + ", " + name +
+                    ") which is non-existent.");
+        }
         return QJSValue();
     }
 
@@ -728,12 +733,16 @@ QJSValue ControllerEngine::connectControl(
     // This check is redundant with makeConnection, but the
     // ControlObjectScript is also needed here to check for duplicate connections.
     if (coScript == nullptr) {
-        if (disconnect) {
-            qWarning() << "ControllerEngine: script tried to disconnect from ControlObject (" +
-                          group + ", " + name + ") which is non-existent, ignoring.";
-        } else {
-            qWarning() << "ControllerEngine: script tried to connect to ControlObject (" +
-                           group + ", " + name + ") which is non-existent, ignoring.";
+        // The test setups do not run all of Mixxx, so ControlObjects not
+        // existing during tests is okay.
+        if (!m_bTesting) {
+            if (disconnect) {
+                throwJSError("ControllerEngine: script tried to disconnect from ControlObject (" +
+                              group + ", " + name + ") which is non-existent.");
+            } else {
+                throwJSError("ControllerEngine: script tried to connect to ControlObject (" +
+                              group + ", " + name + ") which is non-existent.");
+            }
         }
         // This is inconsistent with other failures, which return false.
         // QJSValue() with no arguments is undefined in JavaScript.
diff --git a/src/controllers/engine/controllerengine.h b/src/controllers/engine/controllerengine.h
index 4067d8feecfa..28b7ef2acbe1 100644
--- a/src/controllers/engine/controllerengine.h
+++ b/src/controllers/engine/controllerengine.h
@@ -97,6 +97,8 @@ class ControllerEngine : public QObject {
     void removeScriptConnection(const ScriptConnection conn);
     void triggerScriptConnection(const ScriptConnection conn);
 
+    inline void setTesting(bool testing) { m_bTesting = testing; };
+
   protected:
     double getValue(QString group, QString name);
     void setValue(QString group, QString name, double newValue);
@@ -201,6 +203,8 @@ class ControllerEngine : public QObject {
     QFileSystemWatcher m_scriptWatcher;
     QList<QString> m_lastScriptPaths;
 
+    bool m_bTesting;
+
     friend class ScriptConnection;
     friend class ControllerEngineJSProxy;
     friend class ControllerEngineTest;
diff --git a/src/test/controller_preset_validation_test.cpp b/src/test/controller_preset_validation_test.cpp
index a280dca5fca5..39b6b4070230 100644
--- a/src/test/controller_preset_validation_test.cpp
+++ b/src/test/controller_preset_validation_test.cpp
@@ -13,6 +13,33 @@
 #include "controllers/defs_controllers.h"
 #include "test/mixxxtest.h"
 
+class FakeControllerJSProxy : public ControllerJSProxy {
+  Q_OBJECT
+  public:
+    FakeControllerJSProxy();
+
+    Q_INVOKABLE void send(QList<int> data, unsigned int length = 0) override {
+        Q_UNUSED(data);
+        Q_UNUSED(length);
+    }
+
+    Q_INVOKABLE void sendSysexMsg(QList<int> data, unsigned int length = 0) {
+        Q_UNUSED(data);
+        Q_UNUSED(length);
+    }
+
+    Q_INVOKABLE void sendShortMsg(unsigned char status,
+            unsigned char byte1, unsigned char byte2) {
+        Q_UNUSED(status);
+        Q_UNUSED(byte1);
+        Q_UNUSED(byte2);
+    }
+};
+
+FakeControllerJSProxy::FakeControllerJSProxy()
+        : ControllerJSProxy(nullptr) {
+}
+
 class FakeController : public Controller {
   public:
     FakeController();
@@ -23,6 +50,10 @@ class FakeController : public Controller {
         return ".test.xml";
     }
 
+    ControllerJSProxy* jsProxy() override {
+        return new FakeControllerJSProxy();
+    }
+
     ControllerPresetPointer getPreset() const override {
         if (m_bHidPreset) {
             HidControllerPreset* pClone = new HidControllerPreset();
@@ -116,6 +147,8 @@ class FakeController : public Controller {
 FakeController::FakeController()
         : m_bMidiPreset(false),
           m_bHidPreset(false) {
+    startEngine();
+    getEngine()->setTesting(true);
 }
 
 FakeController::~FakeController() {
@@ -138,7 +171,6 @@ class ControllerPresetValidationTest : public MixxxTest {
 
         FakeController controller;
         controller.setDeviceName("Test Controller");
-        controller.startEngine();
         controller.setPreset(*pPreset);
         // Do not initialize the scripts.
         bool result = controller.applyPreset(m_presetPaths, false);
diff --git a/src/test/controllerengine_test.cpp b/src/test/controllerengine_test.cpp
index 642673e7fa81..7ee67ac296e2 100644
--- a/src/test/controllerengine_test.cpp
+++ b/src/test/controllerengine_test.cpp
@@ -33,7 +33,7 @@ class ControllerEngineTest : public MixxxTest {
     }
 
     bool evaluateScriptFile(const QString& scriptName, QList<QString> scriptPaths = QList<QString>()) {
-    	return cEngine->evaluateScriptFile(scriptName, scriptPaths);
+        return cEngine->evaluateScriptFile(scriptName, scriptPaths);
     }
 
     ControllerEngine *cEngine;