diff --git a/scalalib/test/resources/testrunner/scalatest/src/ScalaTestSpec.scala b/scalalib/test/resources/testrunner/scalatest/src/ScalaTestSpec.scala
index 1ca8c8faa81..832b3aa8f87 100644
--- a/scalalib/test/resources/testrunner/scalatest/src/ScalaTestSpec.scala
+++ b/scalalib/test/resources/testrunner/scalatest/src/ScalaTestSpec.scala
@@ -1,7 +1,10 @@
 package mill.scalalib
 
+import org.scalatest.Tag
 import org.scalatest.freespec.AnyFreeSpec
 
+object TaggedTest extends Tag("tagged")
+
 class ScalaTestSpec extends AnyFreeSpec {
 
   "A Set" - {
@@ -15,6 +18,10 @@ class ScalaTestSpec extends AnyFreeSpec {
           Set.empty.head
         }
       }
+
+      "should be tagged" taggedAs(TaggedTest) in {
+        assert(true)
+      }
     }
   }
 }
diff --git a/scalalib/test/src/mill/scalalib/TestRunnerTests.scala b/scalalib/test/src/mill/scalalib/TestRunnerTests.scala
index dff11e18c1b..c3a09f71b5a 100644
--- a/scalalib/test/src/mill/scalalib/TestRunnerTests.scala
+++ b/scalalib/test/src/mill/scalalib/TestRunnerTests.scala
@@ -7,7 +7,6 @@ import mill.{Agg, T}
 import os.Path
 import sbt.testing.Status
 import utest._
-import utest.framework.TestPath
 
 import java.io.{ByteArrayOutputStream, PrintStream}
 import scala.xml.{Elem, NodeSeq, XML}
@@ -147,8 +146,8 @@ object TestRunnerTests extends TestSuite {
       test("ScalaTest") {
         test("test") - UnitTester(testrunner, resourcePath).scoped { eval =>
           val Right(result) = eval(testrunner.scalatest.test())
-          assert(result.value._2.size == 2)
-          junitReportIn(eval.outPath, "scalatest").shouldHave(2 -> Status.Success)
+          assert(result.value._2.size == 3)
+          junitReportIn(eval.outPath, "scalatest").shouldHave(3 -> Status.Success)
         }
         test("discoveredTestClasses") - UnitTester(testrunner, resourcePath).scoped { eval =>
           val Right(result) = eval.apply(testrunner.scalatest.discoveredTestClasses)
@@ -156,6 +155,37 @@ object TestRunnerTests extends TestSuite {
           assert(result.value == expected)
           expected
         }
+
+        test("testOnly") - {
+          def testOnly(eval: UnitTester, args: Seq[String], size: Int) = {
+            val Right(result) = eval.apply(testrunner.scalatest.testOnly(args: _*))
+            val testOnly = result.value.asInstanceOf[(String, Seq[mill.testrunner.TestResult])]
+            assert(
+              testOnly._2.size == size
+            )
+          }
+          test("all") - UnitTester(testrunner, resourcePath).scoped { eval =>
+            testOnly(eval, Seq("mill.scalalib.ScalaTestSpec"), 3)
+          }
+          test("include") - UnitTester(testrunner, resourcePath).scoped { eval =>
+            testOnly(eval, Seq("mill.scalalib.ScalaTestSpec", "--", "-n", "tagged"), 1)
+          }
+          test("exclude") - UnitTester(testrunner, resourcePath).scoped { eval =>
+            testOnly(eval, Seq("mill.scalalib.ScalaTestSpec", "--", "-l", "tagged"), 2)
+          }
+          test("includeAndExclude") - UnitTester(testrunner, resourcePath).scoped { eval =>
+            val Left(Result.Failure(msg, _)) =
+              eval.apply(testrunner.scalatest.testOnly(
+                "mill.scalalib.ScalaTestSpec",
+                "--",
+                "-n",
+                "tagged",
+                "-l",
+                "tagged"
+              ))
+            assert(msg.contains("Test selector does not match any test"))
+          }
+        }
       }
 
       test("ZioTest") {
diff --git a/testrunner/src/mill/testrunner/TestRunnerUtils.scala b/testrunner/src/mill/testrunner/TestRunnerUtils.scala
index 3cc60d14d47..8e90447d8b3 100644
--- a/testrunner/src/mill/testrunner/TestRunnerUtils.scala
+++ b/testrunner/src/mill/testrunner/TestRunnerUtils.scala
@@ -126,7 +126,7 @@ import scala.jdk.CollectionConverters.IteratorHasAsScala
           yield new TaskDef(
             cls.getName.stripSuffix("$"),
             fingerprint,
-            true,
+            false,
             Array(new SuiteSelector)
           )
       )