Addition of more comprehensive union tests

.github/workflows/test.yaml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   Test:
-    name: 'openapi_sec'
+    name: 'openapi_spec_tests'
     runs-on: ubuntu-22.04
 
     steps:

Makefile

@@ -1,6 +1,8 @@
 .DEFAULT_TARGET: help
 .PHONY: build test coverage docs example
 
+TEST_ARGS ?=
+
 help:
 	@echo "Package Makefile"
 
@@ -28,11 +30,14 @@ example:
 	rm -rf build
 	dart run example/example.dart
 
+# Example use:
+#  make test
+#  make test TEST_ARGS="-n Unions"
 test: 
 	@dart pub get && \
 	rm -rf test/tmp && \
 	clear && \
-	dart test && \
+	dart test $(TEST_ARGS) && \
 	make build-test
 
 format:

test/openai/test.dart

@@ -37,7 +37,7 @@ void main() {
       spec.toJsonFile(destination: testJson);
     });
 
-    // / Test code generation of OpenAPI spec defined models
+    /// Test code generation of OpenAPI spec defined models
     test('Generate Schema Code', () async {
       await spec.generate(
         package: 'openai',

test/openapi_spec_test.dart

@@ -4,6 +4,7 @@ import 'petstore/test.dart' as petstore;
 import 'oas_examples/test.dart' as oas_examples;
 import 'chromadb/test.dart' as chromadb;
 import 'openai/test.dart' as openai;
+import 'unions/test.dart' as unions;
 
 void main() {
   // Ensure a clean test tmp directory
@@ -17,4 +18,5 @@ void main() {
   oas_examples.main();
   chromadb.main();
   openai.main();
+  unions.main();
 }

test/unions/test.dart

@@ -0,0 +1,120 @@
+import 'dart:io';
+import 'package:path/path.dart' as p;
+import 'package:test/test.dart';
+
+import 'package:openapi_spec/openapi_spec.dart';
+
+void main() {
+  final tmp = Directory(
+    p.join('test', 'tmp', 'unions'),
+  );
+
+  final truthJson = p.join('test', 'unions', 'unions.json');
+  final testJson = p.join(tmp.path, 'unions.json');
+
+  final genSchemaDir = p.join(tmp.path, 'gen_schema');
+  final genSchemaOptionsDir = p.join(tmp.path, 'gen_schema_options');
+  final genSchemaSingleDir = p.join(tmp.path, 'gen_schema_single');
+
+  late OpenApi spec;
+
+  group('Unions', () {
+    setUp(() {
+      spec = OpenApi.fromFile(source: truthJson);
+      if (!tmp.existsSync()) {
+        tmp.createSync(recursive: true);
+      }
+    });
+
+    /// Test JSON to Dart [OpenApi] object parsing
+    test('JSON -> Dart', () {
+      // Ensure generated file can be read back into Dart
+      final spec = OpenApi.fromFile(
+        source: truthJson,
+      );
+
+      // Write the Dart representation back to JSON
+      spec.toJsonFile(destination: testJson);
+    });
+
+    /// Test schema generation (multi-file)
+    test('Generate Schema Code', () async {
+      await spec.generate(
+        package: 'unions',
+        quiet: true,
+        destination: genSchemaDir,
+      );
+      final expectedFiles = [
+        'alpha_training.dart',
+        'beta_training.dart',
+        'alpha_transform.dart',
+        'beta_transform.dart',
+        'gamma_transform.dart',
+        'group_transform.dart',
+        'schema.dart',
+        'training_setup.dart',
+        'union_training.dart',
+        'union_transform.dart',
+        'union_transform2.dart',
+      ];
+      final genFiles = Directory(p.join(genSchemaDir, 'schema'))
+          .listSync()
+          .map((e) => p.basename(e.path));
+      for (final file in expectedFiles) {
+        expect(genFiles, contains(file));
+      }
+    });
+
+    /// Test schema generation (single file)
+    test('Generate Schema Code', () async {
+      await spec.generate(
+        package: 'unions',
+        quiet: true,
+        destination: genSchemaSingleDir,
+        schemaOptions: SchemaGeneratorOptions(
+          singleFile: true,
+        ),
+      );
+      final genFiles =
+          Directory(p.join(genSchemaSingleDir, 'schema')).listSync();
+      expect(genFiles.length, 1);
+    });
+
+    /// Test schema generation with union customizations
+    test('Generate Schema Code (Options)', () async {
+      await spec.generate(
+        package: 'unions',
+        quiet: true,
+        destination: genSchemaOptionsDir,
+        schemaOptions: SchemaGeneratorOptions(
+          onSchemaUnionName: (name, unions) {
+            if (name == 'UnionTransform' && unions.length == 3) {
+              return 'UnionTransformMember';
+            }
+            return name;
+          },
+        ),
+      );
+      final expectedFiles = [
+        'alpha_training.dart',
+        'beta_training.dart',
+        'alpha_transform.dart',
+        'beta_transform.dart',
+        'gamma_transform.dart',
+        'group_transform.dart',
+        'schema.dart',
+        'training_setup.dart',
+        'union_training.dart',
+        'union_transform.dart',
+        // This file should be renamed from default "union_transform2.dart"
+        'union_transform_member.dart',
+      ];
+      final genFiles = Directory(p.join(genSchemaOptionsDir, 'schema'))
+          .listSync()
+          .map((e) => p.basename(e.path));
+      for (final file in expectedFiles) {
+        expect(genFiles, contains(file));
+      }
+    });
+  });
+}