Drop mockito-scala-scalatest test dependency

RestServletTest was the only consumer; its 13 scenarios are already
covered end-to-end by JettyRestCallTest, SttpRestCallTest, and
EndpointsIntegrationTest, which run the real RestServlet behind a real
Jetty server. The one previously-unique scenario (mid-stream failure
closing the servlet output stream) is ported to
StreamingRestApiTestScenarios via the existing errorStream fixture, so
JettyRestCallTest now verifies it against a real HTTP client.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ddworak

project/Dependencies.scala

@@ -32,7 +32,6 @@ object Dependencies {
   val fontAwesomeVersion = "5.10.1"
 
   val scalatestVersion = "3.2.20"
-  val mockitoScalaVersion = "2.1.0"
   val scalaJsSecureRandomVersion = "1.0.0" // Tests only
   val bootstrap4Version = "4.1.3"
   val bootstrap4DatepickerVersion = "5.39.0"
@@ -100,7 +99,6 @@ object Dependencies {
     "com.typesafe.scala-logging" %% "scala-logging" % scalaLoggingVersion,
     "org.eclipse.jetty" % "jetty-server" % jettyVersion % Test,
     "org.eclipse.jetty.ee8" % "jetty-ee8-servlet" % jettyVersion % Test,
-    "org.mockito" %% "mockito-scala-scalatest" % mockitoScalaVersion % Test,
   ))
 
   val restSjsDeps = restCrossDeps

rest/.jvm/src/test/scala/io/udash/rest/RestServletTest.scala

@@ -238,4 +238,23 @@ trait StreamingRestApiTestScenarios extends RestApiTest {
         fail("Expected UnsupportedOperationException but operation succeeded")
     }
   }
+
+  "mid-stream server error propagates to client" in {
+    // Regression guard: the servlet must close the response output stream when the source Observable
+    // fails after some items were already committed; otherwise the client would hang indefinitely.
+    streamingProxy
+      .errorStream(immediate = false)
+      .toListL
+      .timeout(5.seconds)
+      .materialize
+      .runToFuture
+      .map {
+        case Failure(_: TimeoutException) =>
+          fail("Server did not terminate the response on mid-stream error (client hung waiting for data)")
+        case Failure(_) =>
+          succeed
+        case Success(list) =>
+          fail(s"Expected failure from mid-stream error, but stream completed successfully with: $list")
+      }
+  }
 }