diff --git a/src/main/scala-sbt-1.0/scalafix/sbt/ScalafixTestkitPlugin.scala b/src/main/scala-sbt-1.0/scalafix/sbt/ScalafixTestkitPlugin.scala
index b23bb967..b8290c77 100644
--- a/src/main/scala-sbt-1.0/scalafix/sbt/ScalafixTestkitPlugin.scala
+++ b/src/main/scala-sbt-1.0/scalafix/sbt/ScalafixTestkitPlugin.scala
@@ -13,38 +13,42 @@ object ScalafixTestkitPlugin extends AutoPlugin {
   override def requires: Plugins = JvmPlugin
 
   object autoImport {
-    case class InputAxis(scalaVersion: String) extends VirtualAxis.WeakAxis {
+    case class TestkitTargetAxis(scalaVersion: String)
+        extends VirtualAxis.WeakAxis {
       private val scalaBinaryVersion =
         CrossVersion.binaryScalaVersion(scalaVersion)
 
-      override val idSuffix = s"Input${scalaBinaryVersion.replace('.', '_')}"
-      override val directorySuffix = s"input$scalaBinaryVersion"
+      override val idSuffix = s"Target${scalaBinaryVersion.replace('.', '_')}"
+      override val directorySuffix = s"target$scalaBinaryVersion"
     }
 
-    object InputAxis {
-      def inputScalaVersion(virtualAxes: Seq[VirtualAxis]): String =
-        virtualAxes.collectFirst { case a: InputAxis => a.scalaVersion }.get
-    }
+    object TestkitTargetAxis {
 
-    def resolveByInputAxis[T](
-        matrix: ProjectMatrix,
-        key: TaskKey[T]
-    ): Def.Initialize[Task[T]] =
-      Def.taskDyn {
-        val sv = InputAxis.inputScalaVersion(virtualAxes.value)
-        val project = matrix.finder().apply(sv)
-        Def.task((project / key).value)
-      }
+      private def targetScalaVersion(virtualAxes: Seq[VirtualAxis]): String =
+        virtualAxes.collectFirst { case a: TestkitTargetAxis =>
+          a.scalaVersion
+        }.get
 
-    def resolveByInputAxis[T](
-        matrix: ProjectMatrix,
-        key: SettingKey[T]
-    ): Def.Initialize[T] =
-      Def.settingDyn {
-        val sv = InputAxis.inputScalaVersion(virtualAxes.value)
-        val project = matrix.finder().apply(sv)
-        Def.setting((project / key).value)
-      }
+      def resolve[T](
+          matrix: ProjectMatrix,
+          key: TaskKey[T]
+      ): Def.Initialize[Task[T]] =
+        Def.taskDyn {
+          val sv = targetScalaVersion(virtualAxes.value)
+          val project = matrix.finder().apply(sv)
+          Def.task((project / key).value)
+        }
+
+      def resolve[T](
+          matrix: ProjectMatrix,
+          key: SettingKey[T]
+      ): Def.Initialize[T] =
+        Def.settingDyn {
+          val sv = targetScalaVersion(virtualAxes.value)
+          val project = matrix.finder().apply(sv)
+          Def.setting((project / key).value)
+        }
+    }
 
     val scalafixTestkitInputClasspath =
       taskKey[Classpath]("Classpath of input project")
@@ -80,7 +84,7 @@ object ScalafixTestkitPlugin extends AutoPlugin {
           "inputClasspath" ->
             scalafixTestkitInputClasspath.value.map(_.data),
           "inputSourceDirectories" ->
-            scalafixTestkitInputSourceDirectories.value,
+            scalafixTestkitInputSourceDirectories.value.distinct, // https://github.com/sbt/sbt/pull/6511
           "outputSourceDirectories" ->
             scalafixTestkitOutputSourceDirectories.value
         )
diff --git a/src/sbt-test/sbt-1.5/testkit/build.sbt b/src/sbt-test/sbt-1.5/testkit/build.sbt
index 1b93899f..70884a86 100644
--- a/src/sbt-test/sbt-1.5/testkit/build.sbt
+++ b/src/sbt-test/sbt-1.5/testkit/build.sbt
@@ -38,40 +38,41 @@ lazy val tests = projectMatrix
   .settings(
     libraryDependencies += "ch.epfl.scala" % "scalafix-testkit" % V.scalafixVersion % Test cross CrossVersion.full,
     scalafixTestkitOutputSourceDirectories :=
-      resolveByInputAxis(output, Compile / unmanagedSourceDirectories).value,
+      TestkitTargetAxis
+        .resolve(output, Compile / unmanagedSourceDirectories)
+        .value,
     scalafixTestkitInputSourceDirectories :=
-      resolveByInputAxis(
-        input,
-        Compile / unmanagedSourceDirectories
-      ).value.distinct, // https://github.com/sbt/sbt/pull/6511
+      TestkitTargetAxis
+        .resolve(input, Compile / unmanagedSourceDirectories)
+        .value,
     scalafixTestkitInputClasspath :=
-      resolveByInputAxis(input, Compile / fullClasspath).value,
+      TestkitTargetAxis.resolve(input, Compile / fullClasspath).value,
     scalafixTestkitInputScalacOptions :=
-      resolveByInputAxis(input, Compile / scalacOptions).value,
+      TestkitTargetAxis.resolve(input, Compile / scalacOptions).value,
     scalafixTestkitInputScalaVersion :=
-      resolveByInputAxis(input, Compile / scalaVersion).value
+      TestkitTargetAxis.resolve(input, Compile / scalaVersion).value
   )
   .defaultAxes(
     rulesCrossVersions.map(VirtualAxis.scalaABIVersion) :+ VirtualAxis.jvm: _*
   )
   .customRow(
     scalaVersions = Seq(V.scala212),
-    axisValues = Seq(InputAxis(scala3Version), VirtualAxis.jvm),
+    axisValues = Seq(TestkitTargetAxis(scala3Version), VirtualAxis.jvm),
     settings = Seq()
   )
   .customRow(
     scalaVersions = Seq(V.scala213),
-    axisValues = Seq(InputAxis(V.scala213), VirtualAxis.jvm),
+    axisValues = Seq(TestkitTargetAxis(V.scala213), VirtualAxis.jvm),
     settings = Seq()
   )
   .customRow(
     scalaVersions = Seq(V.scala212),
-    axisValues = Seq(InputAxis(V.scala212), VirtualAxis.jvm),
+    axisValues = Seq(TestkitTargetAxis(V.scala212), VirtualAxis.jvm),
     settings = Seq()
   )
   .customRow(
     scalaVersions = Seq(V.scala211),
-    axisValues = Seq(InputAxis(V.scala211), VirtualAxis.jvm),
+    axisValues = Seq(TestkitTargetAxis(V.scala211), VirtualAxis.jvm),
     settings = Seq()
   )
   .dependsOn(rules)
diff --git a/src/sbt-test/sbt-1.5/testkit/test b/src/sbt-test/sbt-1.5/testkit/test
index 6e9eb333..41dbb51c 100644
--- a/src/sbt-test/sbt-1.5/testkit/test
+++ b/src/sbt-test/sbt-1.5/testkit/test
@@ -1,3 +1,3 @@
 -> tests/test
-> testsInput3/test:run --save-expect
+> testsTarget3/test:run --save-expect
 > tests/test