optimize Elm syntax for runtime via operator lowering

Author: Viir

implement/Pine.Core.Tests/Elm/ElmSyntax/ElmSyntaxAbstract/ElmSyntaxAbstractTestHelper.cs

@@ -0,0 +1,26 @@
+using Pine.Core.Elm.ElmSyntax.ElmSyntaxAbstract;
+using Pine.Core.Tests.Elm.ElmCompilerInDotnet.Inlining;
+
+using SyntaxTypes = Pine.Core.Elm.ElmSyntax.ElmSyntaxAbstract;
+
+namespace Pine.Core.Tests.Elm.ElmSyntax.ElmSyntaxAbstract;
+
+/// <summary>
+/// Helpers rendering the abstract Elm syntax model into a canonical textual form
+/// used by snapshot-style tests (e.g. operator lowering).
+/// </summary>
+public static class ElmSyntaxAbstractTestHelper
+{
+    /// <summary>
+    /// Renders the given abstract syntax <see cref="SyntaxTypes.File"/> into a canonical,
+    /// elm-format-inspired textual representation suitable for snapshot assertions.
+    /// </summary>
+    public static string RenderModuleForSnapshotTests(SyntaxTypes.File module)
+    {
+        var moduleStil4mElmSyntax7 =
+            Core.Elm.ElmSyntax.Stil4mElmSyntax7.FromFullSyntaxModel.Convert(
+                ConvertToConcrete.FromFile(module));
+
+        return InliningTestHelper.RenderModuleForSnapshotTests(moduleStil4mElmSyntax7);
+    }
+}