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31aa72c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 | """Tests for JSON structure handler."""
import json
import pytest
from headroom.compression.handlers.json_handler import (
JSONStructureHandler,
JSONTokenType,
extract_json_schema,
)
class TestJSONStructureHandler:
"""Tests for JSONStructureHandler."""
@pytest.fixture
def handler(self):
"""Create handler instance."""
return JSONStructureHandler()
def test_can_handle_json_object(self, handler):
"""Test detection of JSON objects."""
assert handler.can_handle('{"key": "value"}') is True
def test_can_handle_json_array(self, handler):
"""Test detection of JSON arrays."""
assert handler.can_handle('[{"id": 1}, {"id": 2}]') is True
def test_cannot_handle_invalid_json(self, handler):
"""Test rejection of invalid JSON."""
assert handler.can_handle("not json") is False
assert handler.can_handle('{"unclosed": ') is False
def test_cannot_handle_plain_text(self, handler):
"""Test rejection of plain text."""
assert handler.can_handle("Hello, world!") is False
def test_preserves_keys(self, handler):
"""Test that JSON keys are marked as structural."""
content = '{"name": "Alice", "age": 30}'
result = handler.get_mask(content)
# Find the key positions in the mask
# "name" should be preserved (with quotes)
name_start = content.index('"name"')
name_end = name_start + len('"name"')
for i in range(name_start, name_end):
assert result.mask.mask[i] is True, f"Key char at {i} should be preserved"
def test_preserves_brackets(self, handler):
"""Test that brackets are preserved."""
content = '{"items": [1, 2, 3]}'
result = handler.get_mask(content)
# Find bracket positions
for i, char in enumerate(content):
if char in "{}[]":
assert result.mask.mask[i] is True, f"Bracket at {i} should be preserved"
def test_preserves_booleans(self, handler):
"""Test that boolean values are preserved."""
content = '{"active": true, "deleted": false}'
result = handler.get_mask(content)
# Find boolean positions
true_start = content.index("true")
false_start = content.index("false")
for i in range(true_start, true_start + 4):
assert result.mask.mask[i] is True
for i in range(false_start, false_start + 5):
assert result.mask.mask[i] is True
def test_preserves_null(self, handler):
"""Test that null values are preserved."""
content = '{"value": null}'
result = handler.get_mask(content)
null_start = content.index("null")
for i in range(null_start, null_start + 4):
assert result.mask.mask[i] is True
def test_preserves_short_strings(self, handler):
"""Test that short string values are preserved."""
handler = JSONStructureHandler(
preserve_short_values=True,
short_value_threshold=10,
)
content = '{"status": "ok"}'
result = handler.get_mask(content)
# "ok" is short, should be preserved
ok_start = content.index('"ok"')
for i in range(ok_start, ok_start + 4):
assert result.mask.mask[i] is True
def test_compresses_long_strings(self, handler):
"""Test that long string values are marked compressible."""
handler = JSONStructureHandler(
preserve_short_values=True,
short_value_threshold=5,
)
# Use a much longer string to ensure compression kicks in
long_value = "x" * 200 # Repetitive content with low entropy
content = f'{{"description": "{long_value}"}}'
result = handler.get_mask(content)
# The long repetitive value should have many compressible characters
desc_start = content.index('"x')
# Not all characters in the long string should be preserved
preserved = sum(result.mask.mask[desc_start:])
# At minimum, some characters should be compressible (not preserved)
total_after_desc = len(content) - desc_start
assert preserved < total_after_desc, (
"Long repetitive strings should be partially compressible"
)
def test_preserves_high_entropy_values(self):
"""Test that high-entropy values (UUIDs) are preserved."""
handler = JSONStructureHandler(
preserve_high_entropy=True,
entropy_threshold=0.8,
)
content = '{"id": "8f14e45f-ceea-4123-8f14-e45fceea4123"}'
result = handler.get_mask(content)
# UUID should be mostly preserved due to high entropy
uuid_start = content.index('"8f14e45f')
preserved = sum(result.mask.mask[uuid_start:])
# Should preserve a significant portion
assert preserved > 10
def test_nested_object(self, handler):
"""Test handling of nested objects."""
content = '{"user": {"name": "Alice", "email": "alice@example.com"}}'
result = handler.get_mask(content)
# Both "user" and "name" keys should be preserved
assert result.mask.mask[content.index('"user"')] is True
assert result.mask.mask[content.index('"name"')] is True
def test_array_of_objects(self, handler):
"""Test handling of array of objects."""
content = '[{"id": 1}, {"id": 2}]'
result = handler.get_mask(content)
# Both "id" keys should be preserved
first_id = content.index('"id"')
second_id = content.index('"id"', first_id + 1)
assert result.mask.mask[first_id] is True
assert result.mask.mask[second_id] is True
def test_metadata_contains_key_count(self, handler):
"""Test that metadata includes key count."""
content = '{"a": 1, "b": 2, "c": 3}'
result = handler.get_mask(content)
assert "key_count" in result.metadata
assert result.metadata["key_count"] == 3
def test_empty_json_object(self, handler):
"""Test handling of empty object."""
content = "{}"
result = handler.get_mask(content)
# Should preserve the brackets
assert result.mask.mask[0] is True # {
assert result.mask.mask[1] is True # }
def test_empty_json_array(self, handler):
"""Test handling of empty array."""
content = "[]"
result = handler.get_mask(content)
assert result.mask.mask[0] is True # [
assert result.mask.mask[1] is True # ]
def test_whitespace_not_preserved(self, handler):
"""Test that whitespace is not preserved."""
content = '{\n "key": "value"\n}'
result = handler.get_mask(content)
# Newlines and spaces should not be preserved
for i, char in enumerate(content):
if char in " \n\t":
assert result.mask.mask[i] is False
def test_handler_name(self, handler):
"""Test handler name is correct."""
assert handler.name == "json"
class TestJSONTokenization:
"""Tests for JSON tokenization."""
@pytest.fixture
def handler(self):
"""Create handler instance."""
return JSONStructureHandler()
def test_tokenizes_simple_object(self, handler):
"""Test tokenization of simple object."""
content = '{"key": "value"}'
tokens = handler._tokenize_json(content)
# Should have: {, "key", :, "value", }
types = [t.token_type for t in tokens]
assert JSONTokenType.BRACKET in types
assert JSONTokenType.KEY in types
assert JSONTokenType.COLON in types
assert JSONTokenType.STRING_VALUE in types
def test_identifies_keys_vs_values(self, handler):
"""Test that keys and values are correctly identified."""
content = '{"name": "Alice"}'
tokens = handler._tokenize_json(content)
key_tokens = [t for t in tokens if t.token_type == JSONTokenType.KEY]
value_tokens = [t for t in tokens if t.token_type == JSONTokenType.STRING_VALUE]
assert len(key_tokens) == 1
assert key_tokens[0].text == '"name"'
assert len(value_tokens) == 1
assert value_tokens[0].text == '"Alice"'
def test_tokenizes_numbers(self, handler):
"""Test tokenization of numbers."""
content = '{"int": 42, "float": 3.14, "negative": -10, "exp": 1e5}'
tokens = handler._tokenize_json(content)
number_tokens = [t for t in tokens if t.token_type == JSONTokenType.NUMBER]
numbers = [t.text for t in number_tokens]
assert "42" in numbers
assert "3.14" in numbers
assert "-10" in numbers
assert "1e5" in numbers
def test_tokenizes_booleans_and_null(self, handler):
"""Test tokenization of booleans and null."""
content = '{"a": true, "b": false, "c": null}'
tokens = handler._tokenize_json(content)
bool_tokens = [t for t in tokens if t.token_type == JSONTokenType.BOOLEAN]
null_tokens = [t for t in tokens if t.token_type == JSONTokenType.NULL]
assert len(bool_tokens) == 2
assert len(null_tokens) == 1
class TestExtractJSONSchema:
"""Tests for extract_json_schema function."""
def test_simple_object_schema(self):
"""Test schema extraction from simple object."""
content = '{"name": "Alice", "age": 30}'
schema = extract_json_schema(content)
assert schema == {"name": "string", "age": "integer"}
def test_nested_object_schema(self):
"""Test schema extraction from nested object."""
content = '{"user": {"name": "Alice", "active": true}}'
schema = extract_json_schema(content)
assert schema == {"user": {"name": "string", "active": "boolean"}}
def test_array_schema(self):
"""Test schema extraction from array."""
content = '[{"id": 1}, {"id": 2}]'
schema = extract_json_schema(content)
assert schema == [{"id": "integer"}]
def test_invalid_json_returns_empty(self):
"""Test that invalid JSON returns empty schema."""
content = "not json"
schema = extract_json_schema(content)
assert schema == {}
def test_mixed_types(self):
"""Test schema with mixed types."""
content = '{"str": "hello", "num": 1.5, "bool": true, "null": null}'
schema = extract_json_schema(content)
assert schema == {
"str": "string",
"num": "number",
"bool": "boolean",
"null": "null",
}
class TestJSONStructurePreservation:
"""Integration tests for JSON structure preservation."""
def test_all_keys_visible_after_compression(self):
"""Test that all keys remain visible in compressed output."""
handler = JSONStructureHandler()
content = json.dumps(
{
"users": [
{"id": 1, "name": "Alice", "email": "alice@example.com"},
{"id": 2, "name": "Bob", "email": "bob@example.com"},
],
"total": 2,
"page": 1,
}
)
result = handler.get_mask(content)
# All keys should be preserved
for key in ["users", "id", "name", "email", "total", "page"]:
key_str = f'"{key}"'
key_start = content.find(key_str)
if key_start != -1:
# At least the first character of the key should be preserved
assert result.mask.mask[key_start] is True, f"Key {key} should be preserved"
def test_large_array_handling(self):
"""Test handling of large arrays."""
handler = JSONStructureHandler(max_array_items_full=3)
# Create array with 100 items
items = [{"id": i, "value": f"item_{i}_" + "x" * 50} for i in range(100)]
content = json.dumps(items)
result = handler.get_mask(content)
# Should have reasonable preservation ratio
# Not everything should be preserved for large arrays
assert 0.1 < result.mask.preservation_ratio < 0.9
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