diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index bbde24de7f90..61a26427664d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -93,7 +93,7 @@ jobs:
 
       - name: Test
         run: |
-          ./project/scripts/sbt ";dotty-bootstrapped/compile ;dotty-bootstrapped/test;sjsSandbox/run;sjsSandbox/test;sjsJUnitTests/test ;configureIDE"
+          ./project/scripts/sbt ";dotty-bootstrapped/compile ;dotty-bootstrapped/test;sjsSandbox/run;sjsSandbox/test;sjsJUnitTests/test;sjsCompilerTests/test ;configureIDE"
           ./project/scripts/bootstrapCmdTests
 
   community_build:
diff --git a/build.sbt b/build.sbt
index b719ef85b892..28559cb1c4a9 100644
--- a/build.sbt
+++ b/build.sbt
@@ -30,6 +30,7 @@ val `community-build` = Build.`community-build`
 
 val sjsSandbox = Build.sjsSandbox
 val sjsJUnitTests = Build.sjsJUnitTests
+val sjsCompilerTests = Build.sjsCompilerTests
 
 val `sbt-dotty` = Build.`sbt-dotty`
 val `vscode-dotty` = Build.`vscode-dotty`
diff --git a/compiler/test/dotty/Properties.scala b/compiler/test/dotty/Properties.scala
index 12b3e2083017..042773505dc5 100644
--- a/compiler/test/dotty/Properties.scala
+++ b/compiler/test/dotty/Properties.scala
@@ -48,6 +48,9 @@ object Properties {
   /** dotty-library jar */
   def dottyLibrary: String = sys.props("dotty.tests.classes.dottyLibrary")
 
+  /** dotty-library-js jar */
+  def dottyLibraryJS: String = sys.props("dotty.tests.classes.dottyLibraryJS")
+
   /** dotty-compiler jar */
   def dottyCompiler: String = sys.props("dotty.tests.classes.dottyCompiler")
 
@@ -74,4 +77,7 @@ object Properties {
 
   /** jline-reader jar */
   def jlineReader: String = sys.props("dotty.tests.classes.jlineReader")
+
+  /** scalajs-library jar */
+  def scalaJSLibrary: String = sys.props("dotty.tests.classes.scalaJSLibrary")
 }
diff --git a/compiler/test/dotty/tools/vulpix/TestConfiguration.scala b/compiler/test/dotty/tools/vulpix/TestConfiguration.scala
index c067fdd8399b..e4348e198941 100644
--- a/compiler/test/dotty/tools/vulpix/TestConfiguration.scala
+++ b/compiler/test/dotty/tools/vulpix/TestConfiguration.scala
@@ -44,6 +44,11 @@ object TestConfiguration {
   lazy val withTastyInspectorClasspath =
     withCompilerClasspath + File.pathSeparator + mkClasspath(List(Properties.dottyTastyInspector))
 
+  lazy val scalaJSClasspath = mkClasspath(List(
+    Properties.scalaJSLibrary,
+    Properties.dottyLibraryJS
+  ))
+
   def mkClasspath(classpaths: List[String]): String =
     classpaths.map({ p =>
       val file = new java.io.File(p)
@@ -61,6 +66,8 @@ object TestConfiguration {
     defaultOptions.withClasspath(withStagingClasspath).withRunClasspath(withStagingClasspath)
   lazy val withTastyInspectorOptions =
     defaultOptions.withClasspath(withTastyInspectorClasspath).withRunClasspath(withTastyInspectorClasspath)
+  lazy val scalaJSOptions =
+    defaultOptions.and("-scalajs").withClasspath(scalaJSClasspath)
   val allowDeepSubtypes = defaultOptions without "-Yno-deep-subtypes"
   val allowDoubleBindings = defaultOptions without "-Yno-double-bindings"
   val picklingOptions = defaultOptions and (
diff --git a/project/Build.scala b/project/Build.scala
index 6a40197cbb4f..e31b8a23c08d 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -174,6 +174,8 @@ object Build {
     fork in Test := true,
     parallelExecution in Test := false,
 
+    outputStrategy := Some(StdoutOutput),
+
     // enable verbose exception messages for JUnit
     testOptions in Test += Tests.Argument(TestFrameworks.JUnit, "-a", "-v"),
   )
@@ -335,7 +337,6 @@ object Build {
   )
 
   lazy val commonBenchmarkSettings = Seq(
-    outputStrategy := Some(StdoutOutput),
     mainClass in (Jmh, run) := Some("dotty.tools.benchmarks.Bench"), // custom main for jmh:run
     javaOptions += "-DBENCH_COMPILER_CLASS_PATH=" + Attributed.data((fullClasspath in (`dotty-bootstrapped`, Compile)).value).mkString("", File.pathSeparator, ""),
     javaOptions += "-DBENCH_CLASS_PATH=" + Attributed.data((fullClasspath in (`dotty-library-bootstrapped`, Compile)).value).mkString("", File.pathSeparator, "")
@@ -404,7 +405,6 @@ object Build {
 
   def dottyDocSettings(implicit mode: Mode) = Seq(
     connectInput in run := true,
-    outputStrategy := Some(StdoutOutput),
 
     javaOptions ++= (javaOptions in `dotty-compiler`).value,
 
@@ -466,7 +466,6 @@ object Build {
   lazy val commonDottyCompilerSettings = Seq(
       // set system in/out for repl
       connectInput in run := true,
-      outputStrategy := Some(StdoutOutput),
 
       // Generate compiler.properties, used by sbt
       resourceGenerators in Compile += Def.task {
@@ -1140,6 +1139,26 @@ object Build {
       }
     )
 
+  lazy val sjsCompilerTests = project.in(file("sjs-compiler-tests")).
+    dependsOn(`dotty-compiler` % "test->test").
+    settings(
+      commonNonBootstrappedSettings,
+
+      // Change the baseDirectory when running the tests
+      baseDirectory in Test := baseDirectory.value.getParentFile,
+
+      javaOptions ++= (javaOptions in `dotty-compiler`).value,
+      javaOptions ++= {
+        val externalJSDeps = (externalDependencyClasspath in (`dotty-library-bootstrappedJS`, Compile)).value
+        val dottyLibraryJSJar = (packageBin in (`dotty-library-bootstrappedJS`, Compile)).value.getAbsolutePath
+
+        Seq(
+          "-Ddotty.tests.classes.dottyLibraryJS=" + dottyLibraryJSJar,
+          "-Ddotty.tests.classes.scalaJSLibrary=" + findArtifactPath(externalJSDeps, "scalajs-library_2.13"),
+        )
+      },
+    )
+
   lazy val `dotty-bench` = project.in(file("bench")).asDottyBench(NonBootstrapped)
   lazy val `dotty-bench-bootstrapped` = project.in(file("bench")).asDottyBench(Bootstrapped)
   lazy val `dotty-bench-run` = project.in(file("bench-run")).asDottyBench(Bootstrapped)
diff --git a/sjs-compiler-tests/test/scala/dotty/tools/dotc/ScalaJSCompilationTests.scala b/sjs-compiler-tests/test/scala/dotty/tools/dotc/ScalaJSCompilationTests.scala
new file mode 100644
index 000000000000..fa28736453c6
--- /dev/null
+++ b/sjs-compiler-tests/test/scala/dotty/tools/dotc/ScalaJSCompilationTests.scala
@@ -0,0 +1,40 @@
+package dotty
+package tools
+package dotc
+
+import org.junit.{ Test, BeforeClass, AfterClass }
+import org.junit.experimental.categories.Category
+
+import scala.concurrent.duration._
+import vulpix._
+
+@Category(Array(classOf[ScalaJSCompilationTests]))
+class ScalaJSCompilationTests extends ParallelTesting {
+  import ParallelTesting._
+  import TestConfiguration._
+  import ScalaJSCompilationTests._
+  import CompilationTest.aggregateTests
+
+  // Test suite configuration --------------------------------------------------
+
+  def maxDuration = 60.seconds
+  def numberOfSlaves = 5
+  def safeMode = Properties.testsSafeMode
+  def isInteractive = SummaryReport.isInteractive
+  def testFilter = Properties.testsFilter
+  def updateCheckFiles: Boolean = Properties.testsUpdateCheckfile
+
+  // Negative tests ------------------------------------------------------------
+
+  @Test def negScalaJS: Unit = {
+    implicit val testGroup: TestGroup = TestGroup("negScalaJS")
+    aggregateTests(
+      compileFilesInDir("tests/neg-scalajs", scalaJSOptions),
+    ).checkExpectedErrors()
+  }
+}
+
+object ScalaJSCompilationTests {
+  implicit val summaryReport: SummaryReporting = new SummaryReport
+  @AfterClass def cleanup(): Unit = summaryReport.echoSummary()
+}
diff --git a/tests/neg-scalajs/reflective-calls.scala b/tests/neg-scalajs/reflective-calls.scala
new file mode 100644
index 000000000000..b5beeac0c302
--- /dev/null
+++ b/tests/neg-scalajs/reflective-calls.scala
@@ -0,0 +1,45 @@
+import scala.reflect.{ClassTag, Selectable => ReflectSel}
+import ReflectSel.reflectiveSelectable
+
+object Test {
+  /* Make sure that an explicit desugaring of the legit cases actually compiles,
+   * ensuring that the error cases we test are actually testing the right things.
+   */
+  def sanityCheck(): Unit = {
+    val receiver: Any = ???
+    reflectiveSelectable(receiver).selectDynamic("foo") // OK
+    reflectiveSelectable(receiver).applyDynamic("foo")() // OK
+    reflectiveSelectable(receiver).applyDynamic("foo", ClassTag(classOf[String]), ClassTag(classOf[List[_]]))("bar", Nil) // OK
+  }
+
+  def badReceider(): Unit = {
+    val receiver: ReflectSel = ???
+    receiver.selectDynamic("foo") // error
+    receiver.applyDynamic("foo")() // error
+  }
+
+  def nonLiteralMethodName(): Unit = {
+    val receiver: Any = ???
+    val methodName: String = "foo"
+    reflectiveSelectable(receiver).selectDynamic(methodName) // error
+    reflectiveSelectable(receiver).applyDynamic(methodName)() // error
+  }
+
+  def nonLiteralClassTag(): Unit = {
+    val receiver: Any = ???
+    val myClassTag: ClassTag[String] = ClassTag(classOf[String])
+    reflectiveSelectable(receiver).applyDynamic("foo", myClassTag, ClassTag(classOf[List[_]]))("bar", Nil) // error
+  }
+
+  def classTagVarArgs(): Unit = {
+    val receiver: Any = ???
+    val classTags: List[ClassTag[_]] = List(ClassTag(classOf[String]), ClassTag(classOf[List[_]]))
+    reflectiveSelectable(receiver).applyDynamic("foo", classTags: _*)("bar", Nil) // error
+  }
+
+  def argsVarArgs(): Unit = {
+    val receiver: Any = ???
+    val args: List[Any] = List("bar", Nil)
+    reflectiveSelectable(receiver).applyDynamic("foo", ClassTag(classOf[String]), ClassTag(classOf[List[_]]))(args: _*) // error
+  }
+}