Found root cause of test failure, I'd added @OnWebsocketError handling in the Communicator. I've commented this out and since I also had updated the error message to be more descriptive then I've also added assertJ dependencies and have updated the test to check the error message _contains_ the expected message instead.

Author: blorp-goes-the-derp

pom.xml

@@ -187,28 +187,19 @@
     </distributionManagement>
 
     <dependencies>
+        <!-- Bot dependencies -->
         <dependency>
             <groupId>org.eclipse.jetty.websocket</groupId>
             <artifactId>websocket-client</artifactId>
             <version>9.4.8.v20171121</version>
         </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-api</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-engine</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
             <version>2.8.2</version>
         </dependency>
+
+        <!-- Logging dependencies -->
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
@@ -219,6 +210,27 @@
             <artifactId>slf4j-simple</artifactId>
             <version>${slf4j.version}</version>
         </dependency>
+
+        <!-- Test dependencies -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>3.18.1</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
 </project>

src/main/java/net/twasi/obsremotejava/OBSCommunicator.java

@@ -149,7 +149,7 @@ public void await() throws InterruptedException {
     @OnWebSocketError
     public void onError(Session session, Throwable throwable) {
         // do nothing for now, this should at least repress "OnWebsocketError not registered" messages
-        runOnError("Websocket error occurred with session " + session, throwable);
+        //runOnError("Websocket error occurred with session " + session, throwable);
     }
 
     @OnWebSocketClose

src/test/java/net/twasi/obsremotejava/test/OBSRemoteControllerTest.java

@@ -12,6 +12,7 @@
 
 import java.util.concurrent.atomic.AtomicReference;
 
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
 import static org.junit.jupiter.api.Assertions.*;
 
 public class OBSRemoteControllerTest {
@@ -66,7 +67,7 @@ void testConnectionToWrongPortAndExpectConnectionFailedError() {
             fail(testFailedReason.get());
         }
 
-        assertEquals("Failed to connect to OBS", connectionFailedResult.get());
+        assertThat(connectionFailedResult.get()).contains("Failed to connect to OBS");
         assertTrue(controller.isFailed());
     }
 }