diff --git a/main/src/main/scala/sbt/Keys.scala b/main/src/main/scala/sbt/Keys.scala
index ebf62d8f8..1b22f3188 100644
--- a/main/src/main/scala/sbt/Keys.scala
+++ b/main/src/main/scala/sbt/Keys.scala
@@ -401,6 +401,8 @@ object Keys {
   val bspBuildTargetRun = inputKey[Unit]("Corresponds to buildTarget/run request").withRank(DTask)
   val bspBuildTargetScalacOptions = inputKey[Unit]("").withRank(DTask)
   val bspBuildTargetScalacOptionsItem = taskKey[ScalacOptionsItem]("").withRank(DTask)
+  val bspScalaTestClasses = inputKey[Unit]("Corresponds to buildTarget/scalaTestClasses request").withRank(DTask)
+  val bspScalaTestClassesItem = taskKey[ScalaTestClassesItem]("").withRank(DTask)
   val bspScalaMainClasses = inputKey[Unit]("Corresponds to buildTarget/scalaMainClasses request").withRank(DTask)
   val bspScalaMainClassesItem = taskKey[ScalaMainClassesItem]("").withRank(DTask)
 
diff --git a/main/src/main/scala/sbt/internal/server/BuildServerProtocol.scala b/main/src/main/scala/sbt/internal/server/BuildServerProtocol.scala
index 4065d760c..b43157e56 100644
--- a/main/src/main/scala/sbt/internal/server/BuildServerProtocol.scala
+++ b/main/src/main/scala/sbt/internal/server/BuildServerProtocol.scala
@@ -142,6 +142,17 @@ object BuildServerProtocol {
       }
     }.evaluated,
     bspBuildTargetScalacOptions / aggregate := false,
+    bspScalaTestClasses := Def.inputTaskDyn {
+      val s = state.value
+      val workspace = bspWorkspace.value
+      val targets = spaceDelimited().parsed.map(uri => BuildTargetIdentifier(URI.create(uri)))
+      val filter = ScopeFilter.in(targets.map(workspace))
+      Def.task {
+        val items = bspScalaTestClassesItem.all(filter).value
+        val result = ScalaTestClassesResult(items.toVector, None)
+        s.respondEvent(result)
+      }
+    }.evaluated,
     bspScalaMainClasses := Def.inputTaskDyn {
       val s = state.value
       val workspace = bspWorkspace.value
@@ -152,7 +163,8 @@ object BuildServerProtocol {
         val result = ScalaMainClassesResult(items.toVector, None)
         s.respondEvent(result)
       }
-    }.evaluated
+    }.evaluated,
+    bspScalaMainClasses / aggregate := false
   )
 
   // This will be scoped to Compile, Test, IntegrationTest etc
@@ -180,6 +192,7 @@ object BuildServerProtocol {
     bspBuildTargetRun := bspRunTask.evaluated,
     bspBuildTargetScalacOptionsItem := scalacOptionsTask.value,
     bspInternalDependencyConfigurations := internalDependencyConfigurationsSetting.value,
+    bspScalaTestClassesItem := scalaTestClassesTask.value,
     bspScalaMainClassesItem := scalaMainClassesTask.value
   )
 
@@ -267,6 +280,12 @@ object BuildServerProtocol {
             val command = Keys.bspBuildTargetScalacOptions.key
             val _ = callback.appendExec(s"$command $targets", Some(r.id))
 
+          case r: JsonRpcRequestMessage if r.method == "buildTarget/scalaTestClasses" =>
+            val param = Converter.fromJson[ScalaTestClassesParams](json(r)).get
+            val targets = param.targets.map(_.uri).mkString(" ")
+            val command = Keys.bspScalaTestClasses.key
+            val _ = callback.appendExec(s"$command $targets", Some(r.id))
+
           case r: JsonRpcRequestMessage if r.method == "buildTarget/scalaMainClasses" =>
             val param = Converter.fromJson[ScalaMainClassesParams](json(r)).get
             val targets = param.targets.map(_.uri).mkString(" ")
@@ -524,6 +543,17 @@ object BuildServerProtocol {
     }
   }
 
+  private def scalaTestClassesTask: Initialize[Task[ScalaTestClassesItem]] = Def.task {
+    val testClasses = Keys.definedTests.?.value
+      .getOrElse(Seq.empty)
+      .map(_.name)
+      .toVector
+    ScalaTestClassesItem(
+      bspTargetIdentifier.value,
+      testClasses
+    )
+  }
+
   private def scalaMainClassesTask: Initialize[Task[ScalaMainClassesItem]] = Def.task {
     val jvmOptions = Keys.javaOptions.value.toVector
     val mainClasses = Keys.discoveredMainClasses.value.map(
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/RunResult.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/RunResult.scala
index 33583b0ed..89f807cd3 100644
--- a/protocol/src/main/contraband-scala/sbt/internal/bsp/RunResult.scala
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/RunResult.scala
@@ -7,7 +7,7 @@ package sbt.internal.bsp
 /**
  * Run Result
  * @param originId An optional request id to know the origin of this report.
- * @param statusCode A status code fore the execution.
+ * @param statusCode A status code for the execution.
  */
 final class RunResult private (
   val originId: Option[String],
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaMainClassesParams.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaMainClassesParams.scala
index 766cfed1d..3a3c10173 100644
--- a/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaMainClassesParams.scala
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaMainClassesParams.scala
@@ -5,6 +5,7 @@
 // DO NOT EDIT MANUALLY
 package sbt.internal.bsp
 /**
+ * Scala Main Class Request
  * The build target main classes request is sent from the client to the server
  * to query for the list of main classes that can be fed as arguments to buildTarget/run.
  * @param originId An optional number uniquely identifying a client request.
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesItem.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesItem.scala
new file mode 100644
index 000000000..087404198
--- /dev/null
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesItem.scala
@@ -0,0 +1,40 @@
+/**
+ * This code is generated using [[https://www.scala-sbt.org/contraband/ sbt-contraband]].
+ */
+
+// DO NOT EDIT MANUALLY
+package sbt.internal.bsp
+/**
+ * @param target The build target that contains the test classes.
+ * @param classes The fully qualified names of the test classes in this target
+ */
+final class ScalaTestClassesItem private (
+  val target: sbt.internal.bsp.BuildTargetIdentifier,
+  val classes: Vector[String]) extends Serializable {
+  
+  
+  
+  override def equals(o: Any): Boolean = o match {
+    case x: ScalaTestClassesItem => (this.target == x.target) && (this.classes == x.classes)
+    case _ => false
+  }
+  override def hashCode: Int = {
+    37 * (37 * (37 * (17 + "sbt.internal.bsp.ScalaTestClassesItem".##) + target.##) + classes.##)
+  }
+  override def toString: String = {
+    "ScalaTestClassesItem(" + target + ", " + classes + ")"
+  }
+  private[this] def copy(target: sbt.internal.bsp.BuildTargetIdentifier = target, classes: Vector[String] = classes): ScalaTestClassesItem = {
+    new ScalaTestClassesItem(target, classes)
+  }
+  def withTarget(target: sbt.internal.bsp.BuildTargetIdentifier): ScalaTestClassesItem = {
+    copy(target = target)
+  }
+  def withClasses(classes: Vector[String]): ScalaTestClassesItem = {
+    copy(classes = classes)
+  }
+}
+object ScalaTestClassesItem {
+  
+  def apply(target: sbt.internal.bsp.BuildTargetIdentifier, classes: Vector[String]): ScalaTestClassesItem = new ScalaTestClassesItem(target, classes)
+}
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesParams.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesParams.scala
new file mode 100644
index 000000000..7903fba21
--- /dev/null
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesParams.scala
@@ -0,0 +1,46 @@
+/**
+ * This code is generated using [[https://www.scala-sbt.org/contraband/ sbt-contraband]].
+ */
+
+// DO NOT EDIT MANUALLY
+package sbt.internal.bsp
+/**
+ * Scala Test Class Request
+ * The build target scala test options request is sent from the client to the server
+ * to query for the list of fully qualified names of test clases in a given list of targets.
+ * @param originId An optional number uniquely identifying a client request.
+ */
+final class ScalaTestClassesParams private (
+  val targets: Vector[sbt.internal.bsp.BuildTargetIdentifier],
+  val originId: Option[String]) extends Serializable {
+  
+  
+  
+  override def equals(o: Any): Boolean = o match {
+    case x: ScalaTestClassesParams => (this.targets == x.targets) && (this.originId == x.originId)
+    case _ => false
+  }
+  override def hashCode: Int = {
+    37 * (37 * (37 * (17 + "sbt.internal.bsp.ScalaTestClassesParams".##) + targets.##) + originId.##)
+  }
+  override def toString: String = {
+    "ScalaTestClassesParams(" + targets + ", " + originId + ")"
+  }
+  private[this] def copy(targets: Vector[sbt.internal.bsp.BuildTargetIdentifier] = targets, originId: Option[String] = originId): ScalaTestClassesParams = {
+    new ScalaTestClassesParams(targets, originId)
+  }
+  def withTargets(targets: Vector[sbt.internal.bsp.BuildTargetIdentifier]): ScalaTestClassesParams = {
+    copy(targets = targets)
+  }
+  def withOriginId(originId: Option[String]): ScalaTestClassesParams = {
+    copy(originId = originId)
+  }
+  def withOriginId(originId: String): ScalaTestClassesParams = {
+    copy(originId = Option(originId))
+  }
+}
+object ScalaTestClassesParams {
+  
+  def apply(targets: Vector[sbt.internal.bsp.BuildTargetIdentifier], originId: Option[String]): ScalaTestClassesParams = new ScalaTestClassesParams(targets, originId)
+  def apply(targets: Vector[sbt.internal.bsp.BuildTargetIdentifier], originId: String): ScalaTestClassesParams = new ScalaTestClassesParams(targets, Option(originId))
+}
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesResult.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesResult.scala
new file mode 100644
index 000000000..8c84ec00e
--- /dev/null
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaTestClassesResult.scala
@@ -0,0 +1,41 @@
+/**
+ * This code is generated using [[https://www.scala-sbt.org/contraband/ sbt-contraband]].
+ */
+
+// DO NOT EDIT MANUALLY
+package sbt.internal.bsp
+/** @param originId An optional id of the request that triggered this result. */
+final class ScalaTestClassesResult private (
+  val items: Vector[sbt.internal.bsp.ScalaTestClassesItem],
+  val originId: Option[String]) extends Serializable {
+  
+  
+  
+  override def equals(o: Any): Boolean = o match {
+    case x: ScalaTestClassesResult => (this.items == x.items) && (this.originId == x.originId)
+    case _ => false
+  }
+  override def hashCode: Int = {
+    37 * (37 * (37 * (17 + "sbt.internal.bsp.ScalaTestClassesResult".##) + items.##) + originId.##)
+  }
+  override def toString: String = {
+    "ScalaTestClassesResult(" + items + ", " + originId + ")"
+  }
+  private[this] def copy(items: Vector[sbt.internal.bsp.ScalaTestClassesItem] = items, originId: Option[String] = originId): ScalaTestClassesResult = {
+    new ScalaTestClassesResult(items, originId)
+  }
+  def withItems(items: Vector[sbt.internal.bsp.ScalaTestClassesItem]): ScalaTestClassesResult = {
+    copy(items = items)
+  }
+  def withOriginId(originId: Option[String]): ScalaTestClassesResult = {
+    copy(originId = originId)
+  }
+  def withOriginId(originId: String): ScalaTestClassesResult = {
+    copy(originId = Option(originId))
+  }
+}
+object ScalaTestClassesResult {
+  
+  def apply(items: Vector[sbt.internal.bsp.ScalaTestClassesItem], originId: Option[String]): ScalaTestClassesResult = new ScalaTestClassesResult(items, originId)
+  def apply(items: Vector[sbt.internal.bsp.ScalaTestClassesItem], originId: String): ScalaTestClassesResult = new ScalaTestClassesResult(items, Option(originId))
+}
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JsonProtocol.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JsonProtocol.scala
index 0cd9acee0..0a2e3fffa 100644
--- a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JsonProtocol.scala
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JsonProtocol.scala
@@ -44,6 +44,9 @@ trait JsonProtocol extends sjsonnew.BasicJsonProtocol
   with sbt.internal.bsp.codec.ScalacOptionsResultFormats
   with sbt.internal.bsp.codec.BspConnectionDetailsFormats
   with sbt.internal.bsp.codec.MetalsMetadataFormats
+  with sbt.internal.bsp.codec.ScalaTestClassesParamsFormats
+  with sbt.internal.bsp.codec.ScalaTestClassesItemFormats
+  with sbt.internal.bsp.codec.ScalaTestClassesResultFormats
   with sbt.internal.bsp.codec.ScalaMainClassesParamsFormats
   with sbt.internal.bsp.codec.ScalaMainClassFormats
   with sbt.internal.bsp.codec.ScalaMainClassesItemFormats
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesItemFormats.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesItemFormats.scala
new file mode 100644
index 000000000..a079301b3
--- /dev/null
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesItemFormats.scala
@@ -0,0 +1,29 @@
+/**
+ * This code is generated using [[https://www.scala-sbt.org/contraband/ sbt-contraband]].
+ */
+
+// DO NOT EDIT MANUALLY
+package sbt.internal.bsp.codec
+import _root_.sjsonnew.{ Unbuilder, Builder, JsonFormat, deserializationError }
+trait ScalaTestClassesItemFormats { self: sbt.internal.bsp.codec.BuildTargetIdentifierFormats with sjsonnew.BasicJsonProtocol =>
+implicit lazy val ScalaTestClassesItemFormat: JsonFormat[sbt.internal.bsp.ScalaTestClassesItem] = new JsonFormat[sbt.internal.bsp.ScalaTestClassesItem] {
+  override def read[J](__jsOpt: Option[J], unbuilder: Unbuilder[J]): sbt.internal.bsp.ScalaTestClassesItem = {
+    __jsOpt match {
+      case Some(__js) =>
+      unbuilder.beginObject(__js)
+      val target = unbuilder.readField[sbt.internal.bsp.BuildTargetIdentifier]("target")
+      val classes = unbuilder.readField[Vector[String]]("classes")
+      unbuilder.endObject()
+      sbt.internal.bsp.ScalaTestClassesItem(target, classes)
+      case None =>
+      deserializationError("Expected JsObject but found None")
+    }
+  }
+  override def write[J](obj: sbt.internal.bsp.ScalaTestClassesItem, builder: Builder[J]): Unit = {
+    builder.beginObject()
+    builder.addField("target", obj.target)
+    builder.addField("classes", obj.classes)
+    builder.endObject()
+  }
+}
+}
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesParamsFormats.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesParamsFormats.scala
new file mode 100644
index 000000000..8a3cad4ae
--- /dev/null
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesParamsFormats.scala
@@ -0,0 +1,29 @@
+/**
+ * This code is generated using [[https://www.scala-sbt.org/contraband/ sbt-contraband]].
+ */
+
+// DO NOT EDIT MANUALLY
+package sbt.internal.bsp.codec
+import _root_.sjsonnew.{ Unbuilder, Builder, JsonFormat, deserializationError }
+trait ScalaTestClassesParamsFormats { self: sbt.internal.bsp.codec.BuildTargetIdentifierFormats with sjsonnew.BasicJsonProtocol =>
+implicit lazy val ScalaTestClassesParamsFormat: JsonFormat[sbt.internal.bsp.ScalaTestClassesParams] = new JsonFormat[sbt.internal.bsp.ScalaTestClassesParams] {
+  override def read[J](__jsOpt: Option[J], unbuilder: Unbuilder[J]): sbt.internal.bsp.ScalaTestClassesParams = {
+    __jsOpt match {
+      case Some(__js) =>
+      unbuilder.beginObject(__js)
+      val targets = unbuilder.readField[Vector[sbt.internal.bsp.BuildTargetIdentifier]]("targets")
+      val originId = unbuilder.readField[Option[String]]("originId")
+      unbuilder.endObject()
+      sbt.internal.bsp.ScalaTestClassesParams(targets, originId)
+      case None =>
+      deserializationError("Expected JsObject but found None")
+    }
+  }
+  override def write[J](obj: sbt.internal.bsp.ScalaTestClassesParams, builder: Builder[J]): Unit = {
+    builder.beginObject()
+    builder.addField("targets", obj.targets)
+    builder.addField("originId", obj.originId)
+    builder.endObject()
+  }
+}
+}
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesResultFormats.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesResultFormats.scala
new file mode 100644
index 000000000..ab51a7bb2
--- /dev/null
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaTestClassesResultFormats.scala
@@ -0,0 +1,29 @@
+/**
+ * This code is generated using [[https://www.scala-sbt.org/contraband/ sbt-contraband]].
+ */
+
+// DO NOT EDIT MANUALLY
+package sbt.internal.bsp.codec
+import _root_.sjsonnew.{ Unbuilder, Builder, JsonFormat, deserializationError }
+trait ScalaTestClassesResultFormats { self: sbt.internal.bsp.codec.ScalaTestClassesItemFormats with sjsonnew.BasicJsonProtocol =>
+implicit lazy val ScalaTestClassesResultFormat: JsonFormat[sbt.internal.bsp.ScalaTestClassesResult] = new JsonFormat[sbt.internal.bsp.ScalaTestClassesResult] {
+  override def read[J](__jsOpt: Option[J], unbuilder: Unbuilder[J]): sbt.internal.bsp.ScalaTestClassesResult = {
+    __jsOpt match {
+      case Some(__js) =>
+      unbuilder.beginObject(__js)
+      val items = unbuilder.readField[Vector[sbt.internal.bsp.ScalaTestClassesItem]]("items")
+      val originId = unbuilder.readField[Option[String]]("originId")
+      unbuilder.endObject()
+      sbt.internal.bsp.ScalaTestClassesResult(items, originId)
+      case None =>
+      deserializationError("Expected JsObject but found None")
+    }
+  }
+  override def write[J](obj: sbt.internal.bsp.ScalaTestClassesResult, builder: Builder[J]): Unit = {
+    builder.beginObject()
+    builder.addField("items", obj.items)
+    builder.addField("originId", obj.originId)
+    builder.endObject()
+  }
+}
+}
diff --git a/protocol/src/main/contraband/bsp.contra b/protocol/src/main/contraband/bsp.contra
index c4b184e27..ca7031cd7 100644
--- a/protocol/src/main/contraband/bsp.contra
+++ b/protocol/src/main/contraband/bsp.contra
@@ -371,6 +371,9 @@ type CompileReport {
   time: Int
 }
 
+
+
+
 ## Run Request
 ## The run request is sent from the client to the server to run a build target.
 ## The server communicates during the initialize handshake whether this method is supported or not.
@@ -399,7 +402,7 @@ type RunResult {
   ## An optional request id to know the origin of this report.
   originId: String
 
-  ## A status code fore the execution.
+  ## A status code for the execution.
   statusCode: Int!
 }
 
@@ -507,6 +510,32 @@ type MetalsMetadata {
   supportedScalaVersions: [String]
 }
 
+## Scala Test Class Request
+## The build target scala test options request is sent from the client to the server
+## to query for the list of fully qualified names of test clases in a given list of targets.
+type ScalaTestClassesParams {
+  targets: [sbt.internal.bsp.BuildTargetIdentifier]
+
+  ## An optional number uniquely identifying a client request.
+  originId: String
+}
+
+type ScalaTestClassesResult {
+  items: [sbt.internal.bsp.ScalaTestClassesItem]
+
+  ## An optional id of the request that triggered this result.
+  originId: String
+}
+
+type ScalaTestClassesItem {
+  ## The build target that contains the test classes.
+  target: sbt.internal.bsp.BuildTargetIdentifier!
+
+  ## The fully qualified names of the test classes in this target
+  classes: [String]
+}
+
+## Scala Main Class Request
 ## The build target main classes request is sent from the client to the server
 ## to query for the list of main classes that can be fed as arguments to buildTarget/run.
 type ScalaMainClassesParams {
diff --git a/server-test/src/server-test/buildserver/build.sbt b/server-test/src/server-test/buildserver/build.sbt
index 2bc71ff1e..fbbfc556b 100644
--- a/server-test/src/server-test/buildserver/build.sbt
+++ b/server-test/src/server-test/buildserver/build.sbt
@@ -6,6 +6,9 @@ lazy val root = (project in file("."))
   .aggregate(foo, util)
 
 lazy val foo = project.in(file("foo"))
+  .settings(
+    libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.8" % "test",
+  )
   .dependsOn(util)
 
 lazy val util = project
diff --git a/server-test/src/server-test/buildserver/foo/src/main/scala/foo/FooMain.scala b/server-test/src/server-test/buildserver/foo/src/main/scala/foo/FooMain.scala
index 9c5a63b10..29209deca 100644
--- a/server-test/src/server-test/buildserver/foo/src/main/scala/foo/FooMain.scala
+++ b/server-test/src/server-test/buildserver/foo/src/main/scala/foo/FooMain.scala
@@ -1,5 +1,7 @@
 package foo
 
 object FooMain extends App {
-  println("Hello World!")
+  val message = "Hello World!"
+
+  println(message)
 }
diff --git a/server-test/src/server-test/buildserver/foo/src/test/scala/foo/FooTest.scala b/server-test/src/server-test/buildserver/foo/src/test/scala/foo/FooTest.scala
new file mode 100644
index 000000000..8e230be99
--- /dev/null
+++ b/server-test/src/server-test/buildserver/foo/src/test/scala/foo/FooTest.scala
@@ -0,0 +1,9 @@
+package foo
+
+import org.scalatest.FreeSpec
+
+class FooTest  extends FreeSpec {
+  "test message" in {
+    assert(FooMain.message == "Hello World!")
+  }
+}
\ No newline at end of file
diff --git a/server-test/src/test/scala/testpkg/BuildServerTest.scala b/server-test/src/test/scala/testpkg/BuildServerTest.scala
index 1bef9cd82..6ee1a26e6 100644
--- a/server-test/src/test/scala/testpkg/BuildServerTest.scala
+++ b/server-test/src/test/scala/testpkg/BuildServerTest.scala
@@ -120,6 +120,20 @@ object BuildServerTest extends AbstractServerTest {
     })
   }
 
+  test("buildTarget/scalaTestClasses") { _ =>
+    val x = s"${svr.baseDirectory.getAbsoluteFile.toURI}#foo/Test"
+    svr.sendJsonRpc(
+      s"""{ "jsonrpc": "2.0", "id": "18", "method": "buildTarget/scalaTestClasses", "params": {
+         |  "targets": [{ "uri": "$x" }]
+         |} }""".stripMargin
+    )
+    assert(svr.waitForString(10.seconds) { s =>
+      println(s)
+      (s contains """"id":"18"""") &&
+      (s contains """"classes":["foo.FooTest"]""")
+    })
+  }
+
   def initializeRequest(): Unit = {
     svr.sendJsonRpc(
       """{ "jsonrpc": "2.0", "id": "10", "method": "build/initialize",