Add regression test for #8405

sbt-app/src/sbt-test/dependency-management/i8405-update-sbt-classifiers-plugins/build.sbt

@@ -0,0 +1,32 @@
+ivyConfiguration := Def.uncached {
+  throw new RuntimeException("updateSbtClassifiers should use updateSbtClassifiers / ivyConfiguration")
+}
+
+dependencyResolution := Def.uncached {
+  throw new RuntimeException("updateSbtClassifiers should use updateSbtClassifiers / dependencyResolution")
+}
+
+lazy val root = (project in file("."))
+  .settings(
+    scalaVersion := "2.11.12",
+    scalaOrganization := "doesnt.exist",
+    name := "myProjectName",
+
+    TaskKey[Unit]("checkPluginsInUpdateSbtClassifiers") := Def.uncached {
+      val updateReport = updateSbtClassifiers.value
+      val moduleReports = updateReport.configurations.find(_.configuration.name == "default").get.modules
+
+      // Calling "distinct" as there are different entries for sources and javadoc classifiers with same module
+      val moduleIds = moduleReports.map(_.module).distinct
+      val moduleIdsShort = moduleIds.map(m => s"${m.organization}:${m.name}")
+
+      // Verify that the target plugin sbt-buildinfo is included in the output
+      // The plugin may be cross-versioned as sbt-buildinfo_sbt2_3, etc.
+      val hasBuildinfoPlugin = moduleIdsShort.exists(id => id.startsWith("com.eed3si9n:sbt-buildinfo"))
+      assert(
+        hasBuildinfoPlugin,
+        s"Plugin com.eed3si9n:sbt-buildinfo was not found in updateSbtClassifiers output. Found modules: ${moduleIdsShort.sorted.mkString(", ")}"
+      )
+    }
+  )
+

sbt-app/src/sbt-test/dependency-management/i8405-update-sbt-classifiers-plugins/project/build.sbt

@@ -0,0 +1,2 @@
+ThisBuild / pluginCrossBuild / sbtVersion := "2.0.0"
+

sbt-app/src/sbt-test/dependency-management/i8405-update-sbt-classifiers-plugins/project/plugins.sbt

@@ -0,0 +1,3 @@
+// Add a plugin to test that it's included in updateSbtClassifiers output
+addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.13.1")
+

sbt-app/src/sbt-test/dependency-management/i8405-update-sbt-classifiers-plugins/test

@@ -0,0 +1,5 @@
+> updateSbtClassifiers
+
+# see assertion definition in build.sbt
+> checkPluginsInUpdateSbtClassifiers
+