Add test cases to json compressor util (#1056)

* delete unused pipeline file

* add json test circle

* add size reduction test case

* add serializable test case

* add invalid json compress test case

* add empty test case

* add special char test case

tests/unittest/test_data/test_json_compressor.py

+import pytest
+import json
+from magic_pdf.libs.json_compressor import JsonCompressor
+
+# Test data fixtures
+@pytest.fixture
+def test_cases():
+    return [
+        # Simple dictionary
+        {"name": "John", "age": 30},
+        
+        # Nested dictionary
+        {
+            "person": {
+                "name": "Alice",
+                "address": {
+                    "street": "123 Main St",
+                    "city": "New York"
+                }
+            }
+        },
+        
+        # List of dictionaries
+        [
+            {"id": 1, "value": "first"},
+            {"id": 2, "value": "second"}
+        ],
+        
+        # Dictionary with various data types
+        {
+            "string": "hello",
+            "integer": 42,
+            "float": 3.14,
+            "boolean": True,
+            "null": None,
+            "array": [1, 2, 3],
+            "nested": {"key": "value"}
+        },
+        
+        # Empty structures
+        {},
+        [],
+        {"empty_list": [], "empty_dict": {}}
+    ]
+
+@pytest.fixture
+def large_data():
+    return {
+        "data": ["test" * 100] * 100  # Create a large repeated string
+    }
+
+def test_compression_decompression_cycle(test_cases):
+    """Test that data remains intact after compression and decompression"""
+    for test_data in test_cases:
+        # Compress the data
+        compressed = JsonCompressor.compress_json(test_data)
+        
+        # Verify compressed string is not empty and is a string
+        assert isinstance(compressed, str)
+        assert len(compressed) > 0
+        
+        # Decompress the data
+        decompressed = JsonCompressor.decompress_json(compressed)
+        
+        # Verify the decompressed data matches original
+        assert test_data == decompressed
+
+def test_compression_reduces_size(large_data):
+    """Test that compression actually reduces data size for large enough input"""
+    original_size = len(json.dumps(large_data))
+    compressed = JsonCompressor.compress_json(large_data)
+    compressed_size = len(compressed)
+    
+    # Verify compression actually saved space
+    assert compressed_size < original_size
+
+def test_invalid_json_serializable():
+    """Test handling of non-JSON serializable input"""
+    with pytest.raises(TypeError):
+        JsonCompressor.compress_json(set([1, 2, 3]))  # sets are not JSON serializable
+
+def test_invalid_compressed_string():
+    """Test handling of invalid compressed string"""
+    with pytest.raises(Exception):
+        JsonCompressor.decompress_json("invalid_base64_string")
+
+def test_empty_string_input():
+    """Test handling of empty string input"""
+    with pytest.raises(Exception):
+        JsonCompressor.decompress_json("")
+
+def test_special_characters():
+    """Test handling of special characters"""
+    test_data = {
+        "special": "!@#$%^&*()_+-=[]{}|;:,.<>?",
+        "unicode": "Hello 世界 🌍"
+    }
+    
+    compressed = JsonCompressor.compress_json(test_data)
+    decompressed = JsonCompressor.decompress_json(compressed)
+    assert test_data == decompressed
+
+# Parametrized test for different types of input
+@pytest.mark.parametrize("test_input", [
+    {"simple": "value"},
+    [1, 2, 3],
+    {"nested": {"key": "value"}},
+    ["mixed", 1, True, None],
+    {"unicode": "🌍"}
+])
+def test_various_input_types(test_input):
+    """Test compression and decompression with various input types"""
+    compressed = JsonCompressor.compress_json(test_input)
+    decompressed = JsonCompressor.decompress_json(compressed)
+    assert test_input == decompressed
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