Failed test demonstrates the problem of #921

Author: NicolasRouquette

scalafix-tests/unit/src/test/scala/scalafix/tests/cli/CliSemanticSuite.scala

@@ -2,10 +2,12 @@ package scalafix.tests.cli
 
 import java.nio.charset.StandardCharsets
 import java.nio.file.Files
+
 import scala.meta.internal.io.PathIO
 import scala.meta.internal.io.FileIO
 import scala.meta.io.Classpath
 import scalafix.cli._
+import scalafix.tests.core.Classpaths
 
 class CliSemanticSuite extends BaseCliSuite {
 
@@ -125,6 +127,24 @@ class CliSemanticSuite extends BaseCliSuite {
     files = explicitResultTypesPath.toString()
   )
 
+  checkSemantic(
+    name = "explicit result types OK (auto-classpath)",
+    args = Array(
+      "--auto-classpath",
+      "--auto-classpath-roots",
+      PathIO.workingDirectory.toString
+    ) ++ Classpaths.scalaLibrary.entries.to[Array].flatMap { path =>
+      Array(
+        "--auto-classpath-roots",
+        path.toString
+      )
+    },
+    expectedExit = ExitStatus.Ok,
+    rule = "ExplicitResultTypes",
+    path = explicitResultTypesPath,
+    files = explicitResultTypesPath.toString()
+  )
+
   checkSemantic(
     name = "incomplete classpath does not result in error exit code",
     args = Array(