Add scripted test

src/main/scala/scalafix/sbt/ScalafixPlugin.scala

@@ -180,13 +180,21 @@ object ScalafixPlugin extends AutoPlugin {
   override lazy val globalSettings: Seq[Def.Setting[_]] = Seq(
     scalafixConfig := None, // let scalafix-cli try to infer $CWD/.scalafix.conf
     scalafixOnCompile := false,
-    scalafixResolvers := Repository.defaults().asScala.toSeq ++ Seq(
-      coursierapi.MavenRepository
-        .of("https://oss.sonatype.org/content/repositories/public"),
-      coursierapi.MavenRepository.of(
-        "https://oss.sonatype.org/content/repositories/snapshots"
-      )
-    ),
+    scalafixResolvers :=
+      // Repository.defaults() defaults to Repository.ivy2Local() and Repository.central(). These can be overridden per
+      // env variable, e.g., export COURSIER_REPOSITORIES="ivy2Local|central|sonatype:releases|jitpack|https://corporate.com/repo".
+      // See https://github.com/coursier/coursier/blob/master/modules/coursier/jvm/src/main/scala/coursier/PlatformResolve.scala#L19-L68
+      // and https://get-coursier.io/docs/other-repositories for more details.
+      // Also see src/sbt-test/sbt-scalafix/scalafixResolvers/test for a scripted test preserving this behavior.
+      Repository.defaults().asScala.toSeq ++
+        Seq(
+          coursierapi.MavenRepository.of(
+            "https://oss.sonatype.org/content/repositories/public"
+          ),
+          coursierapi.MavenRepository.of(
+            "https://oss.sonatype.org/content/repositories/snapshots"
+          )
+        ),
     scalafixDependencies := Nil,
     commands += ScalafixEnable.command,
     scalafixInterfaceProvider := ScalafixInterface.fromToolClasspath(

src/sbt-test/sbt-scalafix/scalafixResolvers/.env

@@ -0,0 +1 @@
+COURSIER_REPOSITORIES="ivy2Local|central|ivy:https://a.b.com/artifactory/snapshots/[organisation]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]"

src/sbt-test/sbt-scalafix/scalafixResolvers/build.sbt

@@ -0,0 +1,29 @@
+scalaVersion := "2.12.7"
+
+TaskKey[Unit]("check") := {
+  val expectedRepositories: Seq[String] = Seq(
+    // Repository.central()
+    "https://repo1.maven.org/maven2",
+    //Repository.ivy2Local()
+    ".ivy2/local/",
+    "https://oss.sonatype.org/content/repositories/public",
+    "https://oss.sonatype.org/content/repositories/snapshots",
+    // custom repository
+    "https://a.b.com/artifactory/snapshots"
+  )
+
+  // scalafixResolvers is lazily evaluated as a stream of coursier.internal.api.ApiHelper.ApiRepo's. To fully evaluate
+  // the stream and overcome object equality issues, build a string from scalafixResolvers.
+  var scalafixRepos: String = ""
+  scalafixResolvers.in(ThisBuild).value.foreach { repo =>
+    scalafixRepos += repo.toString
+  }
+
+  expectedRepositories.foreach { repository =>
+    if (!scalafixRepos.contains(repository)) {
+      throw new Exception(
+        s"repository=$repository not included in scalafixResolvers"
+      )
+    }
+  }
+}

src/sbt-test/sbt-scalafix/scalafixResolvers/project/plugins.sbt

@@ -0,0 +1,3 @@
+resolvers += Resolver.sonatypeRepo("public")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % sys.props("plugin.version"))
+addSbtPlugin("au.com.onegeek" %% "sbt-dotenv" % "2.1.146")

src/sbt-test/sbt-scalafix/scalafixResolvers/test

@@ -0,0 +1,3 @@
+# reload to ensure env variable COURSIER_REPOSITORIES is picked up by scalafixResolvers
+> reload
+> check