diff --git a/.github/workflows/stdlib.yaml b/.github/workflows/stdlib.yaml
index b6fed7c3d8cd..d15328c2ec36 100644
--- a/.github/workflows/stdlib.yaml
+++ b/.github/workflows/stdlib.yaml
@@ -182,3 +182,75 @@ jobs:
       - uses: sbt/setup-sbt@v1
       - name: Compile `scala3-sbt-bridge-bootstrapped`
         run: ./project/scripts/sbt scala3-sbt-bridge-bootstrapped/compile
+
+  #################################################################################################
+  ########################################### TEST JOBS ###########################################
+  #################################################################################################
+
+  test-scala3-sbt-bridge-nonbootstrapped:
+    runs-on: ubuntu-latest
+    ##needs: [scala3-sbt-bridge-nonbootstrapped] Add when we add support for caching here
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          cache: 'sbt'
+      - uses: sbt/setup-sbt@v1
+      - name: Test `scala3-sbt-bridge-nonbootstrapped`
+        run: ./project/scripts/sbt scala3-sbt-bridge-nonbootstrapped/test
+
+  test-scala3-sbt-bridge-bootstrapped:
+    runs-on: ubuntu-latest
+    ##needs: [scala3-sbt-bridge-bootstrapped] Add when we add support for caching here
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          cache: 'sbt'
+      - uses: sbt/setup-sbt@v1
+      - name: Test `scala3-sbt-bridge-bootstrapped`
+        run: ./project/scripts/sbt scala3-sbt-bridge-bootstrapped/test
+
+  test-tasty-core-nonbootstrapped:
+    runs-on: ubuntu-latest
+    ##needs: [tasty-core-nonbootstrapped] Add when we add support for caching here
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          cache: 'sbt'
+      - uses: sbt/setup-sbt@v1
+      - name: Test `tasty-core-nonbootstrapped`
+        run: ./project/scripts/sbt tasty-core-nonbootstrapped/test
+
+  test-tasty-core-bootstrapped:
+    runs-on: ubuntu-latest
+    ##needs: [tasty-core-bootstrapped] Add when we add support for caching here
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          cache: 'sbt'
+      - uses: sbt/setup-sbt@v1
+      - name: Test `tasty-core-bootstrapped`
+        run: ./project/scripts/sbt tasty-core-bootstrapped-new/test
diff --git a/library/src/scala/collection/immutable/List.scala b/library/src/scala/collection/immutable/List.scala
index eff8a8ac8c8a..f7b828bb97b5 100644
--- a/library/src/scala/collection/immutable/List.scala
+++ b/library/src/scala/collection/immutable/List.scala
@@ -658,6 +658,9 @@ final case class :: [+A](override val head: A, private[scala] var next: List[A @
   releaseFence()
   override def headOption: Some[A] = Some(head)
   override def tail: List[A] = next
+
+  def next$access$1 = next
+
 }
 
 case object Nil extends List[Nothing] {
diff --git a/project/Build.scala b/project/Build.scala
index e1edd14a88da..949cfb90eee3 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -1396,14 +1396,25 @@ object Build {
       scalaVersion  := referenceVersion, // nonbootstrapped artifacts are compiled with the reference compiler (already officially published)
       crossPaths    := false, // org.scala-lang:scala3-sbt-bridge doesn't have a crosspath
       autoScalaLibrary := false, // do not add a dependency to stdlib, we depend transitively on the stdlib from `scala3-compiler-nonbootstrapped`
-      // Add the source directories for the stdlib (non-boostrapped)
+      // Add the source directories for the sbt-bridge (non-boostrapped)
       Compile / unmanagedSourceDirectories := Seq(baseDirectory.value / "src"),
+      Test    / unmanagedSourceDirectories := Seq(baseDirectory.value / "test"),
       Compile / resourceDirectory := baseDirectory.value / "resources",
       // NOTE: The only difference here is that we drop `-Werror` and semanticDB for now
       Compile / scalacOptions := Seq("-deprecation", "-feature", "-unchecked", "-encoding", "UTF8", "-language:implicitConversions"),
       // Make sure that the produced artifacts have the minimum JVM version in the bytecode
       Compile / javacOptions  ++= Seq("--target", Versions.minimumJVMVersion),
       Compile / scalacOptions ++= Seq("--java-output-version", Versions.minimumJVMVersion),
+      // Add all the project's external dependencies
+      libraryDependencies ++= Seq(
+        ("org.scala-sbt" %% "zinc-apiinfo" % "1.8.0" % Test).cross(CrossVersion.for3Use2_13),
+        "com.github.sbt" % "junit-interface" % "0.13.3" % Test,
+        ),
+      // Exclude the transitive dependencies from `zinc-apiinfo` that causes issues at the moment
+      excludeDependencies ++= Seq(
+        "org.scala-lang" % "scala-reflect",
+        "org.scala-lang" % "scala-compiler",
+      ),
       // Packaging configuration of the stdlib
       Compile / packageBin / publishArtifact := true,
       Compile / packageDoc / publishArtifact := false,
@@ -1455,7 +1466,7 @@ object Build {
 
   /* Configuration of the org.scala-lang:scala3-sbt-bridge:*.**.**-bootstrapped project */
   lazy val `scala3-sbt-bridge-bootstrapped` = project.in(file("sbt-bridge"))
-    .dependsOn(`scala3-compiler-bootstrapped`) // TODO: Would this actually evict the reference compiler in scala-tool?
+    .dependsOn(`scala3-compiler-bootstrapped-new`) // TODO: Would this actually evict the reference compiler in scala-tool?
     .settings(
       name          := "scala3-sbt-bridge-bootstrapped",
       moduleName    := "scala3-sbt-bridge",
@@ -1464,15 +1475,27 @@ object Build {
       scalaVersion  := referenceVersion, // nonbootstrapped artifacts are compiled with the reference compiler (already officially published)
       crossPaths    := false, // org.scala-lang:scala3-sbt-bridge doesn't have a crosspath
       autoScalaLibrary := false, // do not add a dependency to stdlib, we depend transitively on the stdlib from `scala3-compiler-nonbootstrapped`
-      // Add the source directories for the stdlib (non-boostrapped)
+      // Add the source directories for the sbt-bridge (boostrapped)
       Compile / unmanagedSourceDirectories := Seq(baseDirectory.value / "src"),
+      Test    / unmanagedSourceDirectories := Seq(baseDirectory.value / "test"),
       Compile / resourceDirectory := baseDirectory.value / "resources",
       // NOTE: The only difference here is that we drop `-Werror` and semanticDB for now
       Compile / scalacOptions := Seq("-deprecation", "-feature", "-unchecked", "-encoding", "UTF8", "-language:implicitConversions"),
       // Make sure that the produced artifacts have the minimum JVM version in the bytecode
       Compile / javacOptions  ++= Seq("--target", Versions.minimumJVMVersion),
       Compile / scalacOptions ++= Seq("--java-output-version", Versions.minimumJVMVersion),
-      // Packaging configuration of the stdlib
+      // Add all the project's external dependencies
+      libraryDependencies ++= Seq(
+        ("org.scala-sbt" %% "zinc-apiinfo" % "1.8.0" % Test).cross(CrossVersion.for3Use2_13),
+        "com.github.sbt" % "junit-interface" % "0.13.3" % Test,
+        ),
+      // Exclude the transitive dependencies from `zinc-apiinfo` that causes issues at the moment
+      excludeDependencies ++= Seq(
+        "org.scala-lang" % "scala-reflect",
+        "org.scala-lang" % "scala-compiler",
+      ),
+      //
+      // Packaging configuration of `scala3-sbt-bridge`
       Compile / packageBin / publishArtifact := true,
       Compile / packageDoc / publishArtifact := false,
       Compile / packageSrc / publishArtifact := true,
@@ -1714,10 +1737,17 @@ object Build {
       autoScalaLibrary := false,
       // Add the source directories for the stdlib (non-boostrapped)
       Compile / unmanagedSourceDirectories := Seq(baseDirectory.value / "src"),
+      Test    / unmanagedSourceDirectories := Seq(baseDirectory.value / "test"),
       Compile / unmanagedSourceDirectories += baseDirectory.value / "src-non-bootstrapped",
+      // NOTE: The only difference here is that we drop `-Werror` and semanticDB for now
+      Compile / scalacOptions := Seq("-deprecation", "-feature", "-unchecked", "-encoding", "UTF8", "-language:implicitConversions"),
       // Make sure that the produced artifacts have the minimum JVM version in the bytecode
       Compile / javacOptions  ++= Seq("--target", Versions.minimumJVMVersion),
       Compile / scalacOptions ++= Seq("--java-output-version", Versions.minimumJVMVersion),
+      // Add all the project's external dependencies
+      libraryDependencies ++= Seq(
+        "com.github.sbt" % "junit-interface" % "0.13.3" % Test,
+      ),
       // Packaging configuration of the stdlib
       Compile / packageBin / publishArtifact := true,
       Compile / packageDoc / publishArtifact := false,
@@ -1745,11 +1775,16 @@ object Build {
           state.value,
           scalaInstanceTopLoader.value,
         )},
+      // Add configuration of the test
+      Test / envVars ++= Map(
+        "EXPECTED_TASTY_VERSION" -> expectedTastyVersion,
+      ),
+
     )
 
   /* Configuration of the org.scala-lang:tasty-core_3:*.**.**-bootstrapped project */
   lazy val `tasty-core-bootstrapped-new` = project.in(file("tasty"))
-    .dependsOn(`scala3-library-bootstrapped`)
+    .dependsOn(`scala3-library-bootstrapped-new`)
     .settings(
       name          := "tasty-core-bootstrapped",
       moduleName    := "tasty-core",
@@ -1761,10 +1796,17 @@ object Build {
       autoScalaLibrary := false,
       // Add the source directories for the stdlib (non-boostrapped)
       Compile / unmanagedSourceDirectories := Seq(baseDirectory.value / "src"),
+      Test    / unmanagedSourceDirectories := Seq(baseDirectory.value / "test"),
       Compile / unmanagedSourceDirectories += baseDirectory.value / "src-bootstrapped",
+      // NOTE: The only difference here is that we drop `-Werror` and semanticDB for now
+      Compile / scalacOptions := Seq("-deprecation", "-feature", "-unchecked", "-encoding", "UTF8", "-language:implicitConversions"),
       // Make sure that the produced artifacts have the minimum JVM version in the bytecode
       Compile / javacOptions  ++= Seq("--target", Versions.minimumJVMVersion),
       Compile / scalacOptions ++= Seq("--java-output-version", Versions.minimumJVMVersion),
+      // Add all the project's external dependencies
+      libraryDependencies ++= Seq(
+        "com.github.sbt" % "junit-interface" % "0.13.3" % Test,
+      ),
       // Packaging configuration of the stdlib
       Compile / packageBin / publishArtifact := true,
       Compile / packageDoc / publishArtifact := false,
@@ -1801,6 +1843,10 @@ object Build {
       scalaCompilerBridgeBinaryJar := {
         Some((`scala3-sbt-bridge-nonbootstrapped` / Compile / packageBin).value)
       },
+      // Add configuration of the test
+      Test / envVars ++= Map(
+        "EXPECTED_TASTY_VERSION" -> expectedTastyVersion,
+      ),
     )
 
   // ==============================================================================================
@@ -1930,7 +1976,7 @@ object Build {
 
   /* Configuration of the org.scala-lang:scala3-compiler_3:*.**.**-bootstrapped project */
   lazy val `scala3-compiler-bootstrapped-new` = project.in(file("compiler"))
-    .dependsOn(`scala3-interfaces`, `tasty-core-bootstrapped`, `scala3-library-bootstrapped`)
+    .dependsOn(`scala3-interfaces`, `tasty-core-bootstrapped-new`, `scala3-library-bootstrapped-new`)
     .settings(
       name          := "scala3-compiler-bootstrapped",
       moduleName    := "scala3-compiler",