Simple crash_tests for yaml_edit

[jonasfj]

A set of YAML files that we will load and then use yaml_edit to perform arbitrary edits, attempting to trigger internal errors.

This works because YamlEditor._performEdit will perform the semantic mutation on the existing YamlNode tree, and then modify the YAML string re-parse it and compare it to the semantically expected YamlNode tree.

This ensures that YamlEditor always produces valid YAML, and that the YAML has the expected semantics. The internal check in YamlEditor does not ensure that comments are preserved or that formatting is reasonable. But it does ensure that semantics are as expected, and that the YAML produced is valid.

These tests simply exercises these mechancs.

I've already added quite a few files that we need to immediately skip because we cannot perform certain mutations on them correctly. Is is particularly likely when comments are inserted in weird locations.

How many issues we actually have is hard to quantify, it's quite likely that many of the bugs are the same.

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@kekavc24, I think this is an easy to way to add tests, and at-least make sure we don't have internal errors. I tried it with #2240 and it did seem to fix some of the issues. But feel free to add more for files and/or tests. It might be worth while adding small files that show specifically what we've fixed with each PR.

---

hmm, looking at it, I suspect I could also try to insert maps and lists in flow and block mode at each JSON path in these crash tests. Maybe, that's an exercise for later 🤣

[gemini-code-assist]

Code Review

This pull request introduces a valuable set of crash tests for yaml_edit. The approach of fuzzing the YamlEditor by applying various mutations to different YAML structures is excellent for uncovering edge cases and ensuring robustness. The test implementation is well-structured, using modern Dart features effectively. I have one suggestion to improve the test code's clarity. Overall, this is a great addition to the test suite.

[github-actions]

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pkgs/bazel_worker/benchmark/benchmark.dart
pkgs/benchmark_harness/integration_test/perf_benchmark_test.dart
pkgs/boolean_selector/example/example.dart
pkgs/clock/lib/clock.dart
pkgs/clock/lib/src/clock.dart
pkgs/clock/lib/src/default.dart
pkgs/clock/lib/src/stopwatch.dart
pkgs/clock/lib/src/utils.dart
pkgs/clock/test/clock_test.dart
pkgs/clock/test/default_test.dart
pkgs/clock/test/stopwatch_test.dart
pkgs/clock/test/utils.dart
pkgs/coverage/lib/src/coverage_options.dart
pkgs/html/example/main.dart
pkgs/html/lib/dom.dart
pkgs/html/lib/dom_parsing.dart
pkgs/html/lib/html_escape.dart
pkgs/html/lib/parser.dart
pkgs/html/lib/src/constants.dart
pkgs/html/lib/src/encoding_parser.dart
pkgs/html/lib/src/html_input_stream.dart
pkgs/html/lib/src/list_proxy.dart
pkgs/html/lib/src/query_selector.dart
pkgs/html/lib/src/token.dart
pkgs/html/lib/src/tokenizer.dart
pkgs/html/lib/src/treebuilder.dart
pkgs/html/lib/src/utils.dart
pkgs/html/test/dom_test.dart
pkgs/html/test/parser_feature_test.dart
pkgs/html/test/parser_test.dart
pkgs/html/test/query_selector_test.dart
pkgs/html/test/selectors/level1_baseline_test.dart
pkgs/html/test/selectors/level1_lib.dart
pkgs/html/test/selectors/selectors.dart
pkgs/html/test/support.dart
pkgs/html/test/tokenizer_test.dart
pkgs/html/test/trie_test.dart
pkgs/html/tool/generate_trie.dart
pkgs/pubspec_parse/test/git_uri_test.dart
pkgs/stack_trace/example/example.dart
pkgs/watcher/test/custom_watcher_factory_test.dart
pkgs/yaml_edit/example/example.dart

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Package	Change	Current Version	New Version	Needed Version	Looking good?
yaml_edit	None	2.2.3	2.2.3	2.2.3	✔️

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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:bazel_worker	1.1.5	already published at pub.dev
package:benchmark_harness	2.4.0	already published at pub.dev
package:boolean_selector	2.1.2	already published at pub.dev
package:browser_launcher	1.1.3	already published at pub.dev
package:cli_config	0.2.1-wip	WIP (no publish necessary)
package:cli_util	0.5.0-wip	WIP (no publish necessary)
package:clock	1.1.3-wip	WIP (no publish necessary)
package:code_builder	4.11.1	ready to publish	code_builder-v4.11.1
package:coverage	1.15.0	already published at pub.dev
package:csslib	1.0.2	already published at pub.dev
package:extension_discovery	2.1.0	already published at pub.dev
package:file	7.0.2-wip	WIP (no publish necessary)
package:file_testing	3.1.0-wip	WIP (no publish necessary)
package:glob	2.1.3	already published at pub.dev
package:graphs	2.3.3-wip	WIP (no publish necessary)
package:html	0.15.7-wip	WIP (no publish necessary)
package:io	1.1.0-wip	WIP (no publish necessary)
package:json_rpc_2	4.1.0-wip	WIP (no publish necessary)
package:markdown	7.3.1-wip	WIP (no publish necessary)
package:mime	2.1.0-wip	WIP (no publish necessary)
package:oauth2	2.0.5	already published at pub.dev
package:package_config	2.3.0-wip	WIP (no publish necessary)
package:pool	1.5.2	already published at pub.dev
package:process	5.0.5	already published at pub.dev
package:pub_semver	2.2.0	already published at pub.dev
package:pubspec_parse	1.5.1-wip	WIP (no publish necessary)
package:source_map_stack_trace	2.1.3-wip	WIP (no publish necessary)
package:source_maps	0.10.14-wip	WIP (no publish necessary)
package:source_span	1.10.1	already published at pub.dev
package:sse	4.1.8	already published at pub.dev
package:stack_trace	1.12.2-wip	(error) pubspec version (1.12.2-wip) and changelog (1.12.2-dev) don't agree
package:stream_channel	2.1.4	already published at pub.dev
package:stream_transform	2.1.2-wip	WIP (no publish necessary)
package:string_scanner	1.4.1	already published at pub.dev
package:term_glyph	1.2.3-wip	WIP (no publish necessary)
package:test_reflective_loader	0.5.0	ready to publish	test_reflective_loader-v0.5.0
package:timing	1.0.2	already published at pub.dev
package:unified_analytics	8.0.11	ready to publish	unified_analytics-v8.0.11
package:watcher	1.2.0	already published at pub.dev
package:yaml	3.1.3	already published at pub.dev
package:yaml_edit	2.2.3	already published at pub.dev

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Totals
Change from base Build 20336063870:	0.0%
Covered Lines:	859
Relevant Lines:	884

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