调整版本并做测试

test_null_coalescing.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3.9
+# -*- coding: utf-8 -*-
+"""
+Test null coalescing operator ?? functionality
+"""
+
+from pyenjoy.template.Engine import Engine
+from pyenjoy.kit.Kv import Kv
+
+def test_null_coalescing():
+    """Test null coalescing operator"""
+    print("Testing null coalescing operator...")
+    
+    engine = Engine.use()
+    
+    # Test cases
+    test_cases = [
+        # Template, data, expected result
+        ("#(data??'未知')", {"data": None}, "未知"),
+        ("#(data??'未知')", {"data": "测试"}, "测试"),
+        ("#(data??'未知')", {}, "未知"),
+        ("#(user.name??'匿名')", {"user": {"name": "张三"}}, "张三"),
+        ("#(user.name??'匿名')", {"user": {}}, "匿名"),
+        ("#(user.name??'匿名')", {}, "匿名"),
+        # Nested null coalescing
+        ("#(data1??data2??'默认值')", {"data1": None, "data2": None}, "默认值"),
+        ("#(data1??data2??'默认值')", {"data1": None, "data2": "中间值"}, "中间值"),
+        ("#(data1??data2??'默认值')", {"data1": "第一个值", "data2": "中间值"}, "第一个值"),
+    ]
+    
+    passed = 0
+    failed = 0
+    
+    for i, (template_str, data, expected) in enumerate(test_cases):
+        try:
+            template = engine.get_template_by_string(template_str)
+            result = template.render_to_string(Kv(data))
+            if result == expected:
+                print(f"✓ Test {i+1}: Passed")
+                print(f"   Template: {template_str}")
+                print(f"   Data: {data}")
+                print(f"   Result: {result}")
+                passed += 1
+            else:
+                print(f"✗ Test {i+1}: Failed")
+                print(f"   Template: {template_str}")
+                print(f"   Data: {data}")
+                print(f"   Expected: {expected}")
+                print(f"   Got: {result}")
+                failed += 1
+        except Exception as e:
+            print(f"✗ Test {i+1}: Error")
+            print(f"   Template: {template_str}")
+            print(f"   Data: {data}")
+            print(f"   Error: {e}")
+            failed += 1
+        print()
+    
+    print(f"Summary: {passed} passed, {failed} failed")
+    return passed == len(test_cases)
+
+if __name__ == "__main__":
+    success = test_null_coalescing()
+    exit(0 if success else 1)