Add a couple tests

modules/parser/src/test/scala/playground/smithyql/parser/v3/TreeSitterParserTests.scala

@@ -0,0 +1,124 @@
+package playground.smithyql.parser.v3
+
+import org.polyvariant.treesitter4s.Node
+import org.polyvariant.treesitter4s.TreeSitterAPI
+import playground.generated.nodes.SourceFile
+import weaver.*
+
+object TreeSitterParserTests extends FunSuite {
+
+  private def parse(s: String): SourceFile = {
+    val p = TreeSitterAPI.make("smithyql")
+    SourceFile.unsafeApply(p.parse(s).rootNode.get)
+  }
+
+  test("SourceFile fields") {
+    val in = parse("""use service foo.bar.baz.bax#Baz
+                     |GetBaz{}""".stripMargin)
+
+    assert(in.use_clause.nonEmpty) &&
+    assert(in.statements.nonEmpty)
+  }
+
+  test("All parents of deep child") {
+    val allNodes = parse("""use service foo.bar.baz.bax#Baz
+                           |GetBaz { a = { x = 42 }}""".stripMargin)
+      .fold[List[Node]](_ :: _.flatten.toList)
+
+    val parentTypesAndSources = allNodes
+      .find(_.source == "x")
+      .get
+      .selfAndParents
+      .map(n => n.tpe -> n.source)
+      .mkString("\n")
+
+    val expected = List(
+      "identifier" -> "x",
+      "binding" -> "x = 42",
+      "bindings" -> "x = 42",
+      "struct" -> "{ x = 42 }",
+      "binding" -> "a = { x = 42 }",
+      "bindings" -> "a = { x = 42 }",
+      "struct" -> "{ a = { x = 42 }}",
+      "operation_call" -> "GetBaz { a = { x = 42 }}",
+      "top_level_statement" -> "GetBaz { a = { x = 42 }}",
+      "source_file" -> "use service foo.bar.baz.bax#Baz\nGetBaz { a = { x = 42 }}",
+    ).mkString("\n")
+
+    assert.same(expected, parentTypesAndSources)
+  }
+
+  test("Deep insight into field") {
+    val in = parse("""use service foo.bar.baz.bax#Baz
+                     |GetBaz { a = { x = 42 } }""".stripMargin)
+
+    // this ain't pretty huh
+    // watch out for the upcoming lookup DSL
+    val valueOfX =
+      in.statements
+        .get
+        .operation_call
+        .get
+        .input
+        .get
+        .bindings
+        .get
+        .binding
+        .find(_.key.get.source == "a")
+        .get
+        .value
+        .get
+        .asStruct
+        .get
+        .bindings
+        .get
+        .binding
+        .find(_.key.get.source == "x")
+        .get
+        .value
+        .get
+        .asNumber
+        .get
+        .source
+        .toInt
+
+    assert.eql(42, valueOfX)
+  }
+
+  test("Deep insight into field, but the file isn't valid") {
+    val in = parse("""use service fo o.b ar.b/az.bax/#//B//,,{}az
+                     |GetBa z { a = { x = 42, 50 }, z, 42 }""".stripMargin)
+
+    // this ain't pretty huh
+    // watch out for the upcoming lookup DSL
+    val valueOfX =
+      in.statements
+        .get
+        .operation_call
+        .get
+        .input
+        .get
+        .bindings
+        .get
+        .binding
+        .find(_.key.get.source == "a")
+        .get
+        .value
+        .get
+        .asStruct
+        .get
+        .bindings
+        .get
+        .binding
+        .find(_.key.get.source == "x")
+        .get
+        .value
+        .get
+        .asNumber
+        .get
+        .source
+        .toInt
+
+    assert.eql(42, valueOfX)
+  }
+}