95 lines
3.2 KiB
Python
95 lines
3.2 KiB
Python
"""Utilities for truncating assertion output.
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Current default behaviour is to truncate assertion explanations at
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~8 terminal lines, unless running in "-vv" mode or running on CI.
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"""
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from typing import List
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from typing import Optional
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from _pytest.assertion import util
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from _pytest.nodes import Item
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DEFAULT_MAX_LINES = 8
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DEFAULT_MAX_CHARS = 8 * 80
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USAGE_MSG = "use '-vv' to show"
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def truncate_if_required(
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explanation: List[str], item: Item, max_length: Optional[int] = None
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) -> List[str]:
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"""Truncate this assertion explanation if the given test item is eligible."""
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if _should_truncate_item(item):
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return _truncate_explanation(explanation)
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return explanation
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def _should_truncate_item(item: Item) -> bool:
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"""Whether or not this test item is eligible for truncation."""
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verbose = item.config.option.verbose
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return verbose < 2 and not util.running_on_ci()
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def _truncate_explanation(
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input_lines: List[str],
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max_lines: Optional[int] = None,
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max_chars: Optional[int] = None,
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) -> List[str]:
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"""Truncate given list of strings that makes up the assertion explanation.
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Truncates to either 8 lines, or 640 characters - whichever the input reaches
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first. The remaining lines will be replaced by a usage message.
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"""
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if max_lines is None:
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max_lines = DEFAULT_MAX_LINES
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if max_chars is None:
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max_chars = DEFAULT_MAX_CHARS
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# Check if truncation required
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input_char_count = len("".join(input_lines))
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if len(input_lines) <= max_lines and input_char_count <= max_chars:
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return input_lines
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# Truncate first to max_lines, and then truncate to max_chars if max_chars
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# is exceeded.
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truncated_explanation = input_lines[:max_lines]
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truncated_explanation = _truncate_by_char_count(truncated_explanation, max_chars)
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# Add ellipsis to final line
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truncated_explanation[-1] = truncated_explanation[-1] + "..."
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# Append useful message to explanation
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truncated_line_count = len(input_lines) - len(truncated_explanation)
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truncated_line_count += 1 # Account for the part-truncated final line
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msg = "...Full output truncated"
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if truncated_line_count == 1:
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msg += f" ({truncated_line_count} line hidden)"
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else:
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msg += f" ({truncated_line_count} lines hidden)"
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msg += f", {USAGE_MSG}"
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truncated_explanation.extend(["", str(msg)])
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return truncated_explanation
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def _truncate_by_char_count(input_lines: List[str], max_chars: int) -> List[str]:
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# Check if truncation required
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if len("".join(input_lines)) <= max_chars:
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return input_lines
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# Find point at which input length exceeds total allowed length
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iterated_char_count = 0
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for iterated_index, input_line in enumerate(input_lines):
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if iterated_char_count + len(input_line) > max_chars:
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break
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iterated_char_count += len(input_line)
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# Create truncated explanation with modified final line
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truncated_result = input_lines[:iterated_index]
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final_line = input_lines[iterated_index]
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if final_line:
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final_line_truncate_point = max_chars - iterated_char_count
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final_line = final_line[:final_line_truncate_point]
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truncated_result.append(final_line)
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return truncated_result
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