fix tests

README.md

@@ -5,9 +5,10 @@
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.circe/circe-yaml_2.12/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.circe/circe-yaml_2.12)
 
 This is a small library for parsing [YAML](https://yaml.org) into [circe](https://github.com/circe/circe)'s `Json` AST.
- * For parsing YAML 1.1 it uses [SnakeYAML](https://bitbucket.org/snakeyaml/snakeyaml).
- * For parsing YAML 1.2 it uses [snakeyaml-engine](https://bitbucket.org/snakeyaml/snakeyaml-engine).
- * For parsing YAML on Scala.js or Scala Native (as well as Scala/JVM) it uses [scala-yaml](https://github.com/VirtusLab/scala-yaml).
+You can choose from multiple YAML backends:
+ * `circe-yaml`: For parsing YAML 1.1 it uses [SnakeYAML](https://bitbucket.org/snakeyaml/snakeyaml).
+ * `circe-yaml-v12`: For parsing YAML 1.2 it uses [snakeyaml-engine](https://bitbucket.org/snakeyaml/snakeyaml-engine).
+ * `circe-yaml-scalayaml`: For parsing YAML on Scala.js or Scala Native (as well as Scala/JVM) it uses [scala-yaml](https://github.com/VirtusLab/scala-yaml).
 
 ## Why?
 
@@ -25,11 +26,15 @@ The artifact is hosted by Sonatype, and release versions are synced to Maven Cen
 
 For YAML 1.1
 ```scala
-libraryDependencies += "io.circe" %% "circe-yaml" % "0.14.2"
+libraryDependencies += "io.circe" %% "circe-yaml" % "0.15.4"
 ```
 or for YAML 1.2
 ```scala
-libraryDependencies += "io.circe" %% "circe-yaml-v12" % "0.14.2"
+libraryDependencies += "io.circe" %% "circe-yaml-v12" % "0.15.4"
+```
+or for YAML on Scala.js or Scala Native (as well as Scala/JVM)
+```scala
+libraryDependencies += "io.circe" %% "circe-yaml-scalayaml" % "0.15.4"
 ```
 
 Snapshot versions are available by adding the Sonatype Snapshots resolver:

circe-yaml-scalayaml/shared/src/main/scala/io/circe/yaml/scalayaml/Printer.scala

@@ -20,6 +20,8 @@ import io.circe.Json
 import org.virtuslab.yaml.Node
 import org.virtuslab.yaml.NodeOps
 
+import scala.collection.immutable.ListMap
+
 object Printer extends io.circe.yaml.common.Printer {
 
   override def pretty(json: Json): String = {
@@ -31,7 +33,8 @@ object Printer extends io.circe.yaml.common.Printer {
     case Json.JArray(value) =>
       Node.SequenceNode(value.map(jsonToNode): _*)
     case Json.JObject(value) =>
-      Node.MappingNode(value.toMap.map { case (key, value) => (Node.ScalarNode(key): Node) -> jsonToNode(value) })
+      val mappings = value.toList.map { case (key, value) => (Node.ScalarNode(key): Node) -> jsonToNode(value) }
+      Node.MappingNode(ListMap.from(mappings))
     case json =>
       Node.ScalarNode(json.toString)
   }

circe-yaml-scalayaml/shared/src/test/scala/io/circe/yaml/scalayaml/PrinterTests.scala

@@ -75,7 +75,7 @@ class PrinterTests extends AnyFreeSpec with Matchers {
 
   "Drop null keys" in {
     val json = Json.obj("nullField" -> Json.Null, "nonNullField" -> Json.fromString("foo"))
-    Printer.pretty(json) shouldEqual "nullField: null\nnonNullField: \"foo\"\n"
+    Printer.pretty(json) shouldEqual "nullField: !!null\nnonNullField: \"foo\"\n"
   }
 
   "Root integer" in {