add toString to UpdateOptions

librarymanagement/src/main/scala/sbt/librarymanagement/UpdateOptions.scala

@@ -1,6 +1,5 @@
 package sbt.librarymanagement
 
-import java.io.File
 import org.apache.ivy.plugins.resolver.DependencyResolver
 import org.apache.ivy.core.settings.IvySettings
 import sbt.util.Logger
@@ -50,6 +49,14 @@ final class UpdateOptions private[sbt] (
       cachedResolution,
       resolverConverter)
 
+  override def toString(): String =
+    s"""UpdateOptions(
+        |  circularDependencyLevel = $circularDependencyLevel,
+        |  latestSnapshots = $latestSnapshots,
+        |  consolidatedResolution = $consolidatedResolution,
+        |  cachedResolution = $cachedResolution
+        |)""".stripMargin
+
   override def equals(o: Any): Boolean = o match {
     case o: UpdateOptions =>
       this.circularDependencyLevel == o.circularDependencyLevel &&

librarymanagement/src/test/scala/UpdateOptionsSpec.scala

@@ -0,0 +1,27 @@
+package sbt.librarymanagement
+
+import sbt.internal.util.UnitSpec
+
+class UpdateOptionsSpec extends UnitSpec {
+
+  "UpdateOptions" should "have proper toString defined" in {
+    UpdateOptions().toString() should be(
+      """|UpdateOptions(
+        |  circularDependencyLevel = warn,
+        |  latestSnapshots = false,
+        |  consolidatedResolution = false,
+        |  cachedResolution = false
+        |)""".stripMargin)
+
+    UpdateOptions()
+      .withCircularDependencyLevel(CircularDependencyLevel.Error)
+      .withCachedResolution(true)
+      .withLatestSnapshots(true).toString() should be(
+      """|UpdateOptions(
+        |  circularDependencyLevel = error,
+        |  latestSnapshots = true,
+        |  consolidatedResolution = false,
+        |  cachedResolution = true
+        |)""".stripMargin)
+  }
+}