Show more than first line when using mocha test runner

samples/js/build.gradle.kts

@@ -1,6 +1,8 @@
 // Example project to show how to use Atrium in combination with mocha
 // For more information on how to setup Atrium for a JS project -> https://github.com/robstoll/atrium#js
 
+import org.gradle.api.tasks.testing.logging.TestExceptionFormat
+
 // for infix-api -> change to 'atrium-infix-en_GB-js'
 val atriumApi = "atrium-fluent-en_GB-js"
 val atriumVersion = "0.16.0"
@@ -28,6 +30,12 @@ version = "0.0.1"
 
 kotlin {
     js {
-        nodejs()
+        nodejs {
+            testTask {
+                testLogging {
+                    exceptionFormat = TestExceptionFormat.FULL // Show full exception when an assertion fails
+                }
+            }
+        }
     }
 }