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fix(coverage): allow empty coverage files from skipped test suites (#2667) - #2668
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liamappelbe merged 3 commits intoNov 3, 2026
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…art-lang#2667) - In HitMap.parseFiles, treat an empty Map ({}) as an empty coverage report instead of throwing a FormatException. Fixes dart-lang#2667
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This pull request fixes HitMap.parseFiles to gracefully handle empty {} coverage files generated by dart test --coverage for skipped test suites, rather than throwing a FormatException. It also adds corresponding unit tests to verify this behavior. The feedback suggests using a more concise and idiomatic Dart 3 object pattern (case Map(isEmpty: true):) instead of a guard clause to match the empty map.
| ), | ||
| ); | ||
| case final decoded: | ||
| case final Map map when map.isEmpty: |
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In Dart 3, you can use object patterns to match an empty map more concisely and idiomatically without binding an unused variable. Consider using case Map(isEmpty: true): instead of case final Map map when map.isEmpty:.
Suggested change
| case final Map map when map.isEmpty: | |
| case Map(isEmpty: true): |
References
- Write code following the guidance described in Effective Dart and optimize for readability. (link)
Adopt idiomatic Dart 3 object pattern syntax suggested in code review.
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Revisions updated by `dart tools/rev_sdk_deps.dart`. core (https://github.com/dart-lang/core/compare/24e09c4..36f57a9): 36f57a99 Tue Nov 3 14:26:17 2026 +0100 Sigurd Meldgaard [os_detect] Remove bin/os_detect.dart (dart-lang/core#1015) 86bacfca Tue Nov 3 05:15:19 2026 -0500 Justin White [characters] Fix RangeError on an unpaired tail surrogate at range start (dart-lang/core#1033) dartdoc (https://github.com/dart-lang/dartdoc/compare/db94437..2f6847b): 2f6847bd Thu Oct 29 11:47:04 2026 +0200 Sergey G. Grekhov Add tests for invalid doc comments placement (dart-lang/dartdoc#4301) 17f2f0a3 Thu Oct 29 10:16:36 2026 +0100 Sarah Zakarias Compare base elements and unify properties in doc-reference-target-differs (dart-lang/dartdoc#4307) dartdoc is held back at 2f6847b, before dart-lang/dartdoc#4312, because its mock SDK version changes conflict in the google3 3-way merge with the hotfix in cl/1005963642. ecosystem (https://github.com/dart-lang/ecosystem/compare/f8faabf..54e1673): 54e1673 Wed Nov 4 09:46:54 2026 +0100 Sigurd Meldgaard fix(firehose): resolve dartExecutable via package:cli_util (dart-lang/ecosystem#469) d754065 Tue Nov 3 10:09:45 2026 -0800 Kevin Moore refactor(corpus): use path.join and seal closed type hierarchies (dart-lang/ecosystem#476) http (https://github.com/dart-lang/http/compare/8c0d66a..1f869d0): 1f869d0 Tue Nov 3 15:51:52 2026 -0800 dependabot[bot] chore(deps): bump the github-actions group with 8 updates (dart-lang/http#2052) 6d7f402 Tue Nov 3 14:12:04 2026 -0800 Brian Quinlan feat(cupertino_http): support custom trust eval (dart-lang/http#2038) 73f8c36 Tue Nov 3 10:15:16 2026 -0800 Brian Quinlan chore(cupertino_http): ready 3.1.1 release (dart-lang/http#2056) native (https://github.com/dart-lang/native/compare/b442038..1838637): 183863758 Wed Nov 4 09:01:27 2026 -0300 Daco Harkes [hooks_runner] Add `PKG_CONFIG_PATH` to environment variables allowlist (dart-lang/native#3779) c9e8118d4 Wed Nov 4 08:16:20 2026 +1100 Liam Appelbe [jni] Fix release mode segfault (dart-lang/native#3777) 5999cf7e4 Wed Nov 4 08:16:16 2026 +1100 Liam Appelbe [objective_c] Prepare to publish (dart-lang/native#3778) d294d9942 Tue Nov 3 15:15:49 2026 +0100 Michael Goderbauer [hooks_runner] Write recorded_uses.json under directory lock in link() (dart-lang/native#3770) 33aa5ef04 Tue Nov 3 11:42:38 2026 +1100 Liam Appelbe [objective_c] Cheaper and safer object/block validity checks (dart-lang/native#3776) protobuf (https://github.com/dart-lang/protobuf/compare/1d52301..19191c8): 19191c8 Wed Nov 4 17:14:33 2026 +0100 Sigurd Meldgaard Use dart.tool.dart2wasm in json.dart so DDC uses json_web.dart (google/protobuf.dart#1108) tools (https://github.com/dart-lang/tools/compare/1579f8d..a342744): a3427446f Wed Nov 4 15:11:35 2026 +0100 Jonas Finnemann Jensen Update CODEOWNERS for pkgs/markdown (dart-lang/tools#2795) 08c9afdc0 Wed Nov 4 14:40:44 2026 +0100 Jonas Finnemann Jensen [markdown] Check URL boundary before matching in AutolinkExtensionSyntax (dart-lang/tools#2786) 0fc5edcae Wed Nov 4 14:35:48 2026 +0100 Jonas Finnemann Jensen [markdown] Skip unclosed inline HTML tags before matching RegExp (dart-lang/tools#2788) b1f6f9956 Wed Nov 4 14:31:55 2026 +0100 Jonas Finnemann Jensen [markdown] Defer shortcut reference link label extraction in LinkSyntax.close (dart-lang/tools#2785) ab135e072 Wed Nov 4 14:30:37 2026 +0100 Jonas Finnemann Jensen [markdown] Avoid quadratic trailing-paren scan in AutolinkExtensionSyntax (dart-lang/tools#2787) f329bf3ea Wed Nov 4 17:09:34 2026 +0530 Ananya Kaul [code_builder] Separate chained cascades after nullable casts (dart-lang/tools#2704) 0a57e3446 Wed Nov 4 05:28:40 2026 +0530 Aman Maurya fix(coverage): allow empty coverage files from skipped test suites (`#2667`) (dart-lang/tools#2668) e95958f6a Tue Nov 3 21:53:57 2026 +0000 Keerti Parthasarathy [unified_analytics] Add root_tool and leaf_tool to every event; key consent on root_tool (dart-lang/tools#2784) 5da06a508 Tue Nov 3 13:11:04 2026 +0100 Jonas Finnemann Jensen [markdown] Reject unescaped '(' in parenthesized inline link titles (dart-lang/tools#2770) f3a5c9277 Tue Nov 3 13:09:32 2026 +0100 Jonas Finnemann Jensen [markdown] Cap parenthesis nesting in bare inline link destinations (dart-lang/tools#2769) 820ce5fb7 Tue Nov 3 13:04:35 2026 +0100 Jonas Finnemann Jensen [markdown] Reject unescaped '(' in parenthesized link reference titles (dart-lang/tools#2771) 775c5d080 Tue Nov 3 13:03:43 2026 +0100 Jonas Finnemann Jensen [markdown] Require balanced parentheses before bare inline link titles (dart-lang/tools#2768) 5ebd52bc5 Tue Nov 3 13:03:08 2026 +0100 Jonas Finnemann Jensen [markdown] Reject unescaped '<' in bracketed inline link destinations (dart-lang/tools#2767) feb7ea928 Tue Nov 3 13:02:15 2026 +0100 Jonas Finnemann Jensen [markdown] Fix 999-character limit in LinkParser.parseLabel (dart-lang/tools#2766) 31888a5da Tue Nov 3 13:01:43 2026 +0100 Jonas Finnemann Jensen [markdown] Enforce 999-character limit in _parseReferenceLinkLabel (dart-lang/tools#2765) e016c5d70 Tue Nov 3 09:26:32 2026 +0100 dart-ecosystem-bot[bot] [boring] Pin the prebuilt binaries of boring-binaries-20261101-f869fdca423c (dart-lang/tools#2778) 8c7935573 Mon Nov 2 10:15:24 2026 -0800 Kevin Moore [html] Move WPT selector fixtures to third_party/wpt-selectors (dart-lang/tools#2772) web (https://github.com/dart-lang/web/compare/45166fd..f388bf5): f388bf5 Sun Nov 1 06:57:22 2026 +0000 dependabot[bot] Bump the github-actions group with 4 updates (dart-lang/web#611) 658ce2f Sat Oct 31 12:47:20 2026 +0100 Moritz Migrate to ecosystem health publish check and setup-dart publish workflow (dart-lang/web#610) Change-Id: Ifcae02c4712b4b27a5a8ab1c57d8dcf13a6700cf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/574281 Reviewed-by: Brian Quinlan <[email protected]> Commit-Queue: Nate Bosch <[email protected]>
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Rationale
When every test in a suite is skipped (for example, excluded by tag in
dart_test.yaml),dart test --coverage=coveragewrites a coverage report JSON file containing{}.In 1.16.0 (#2448),
HitMap.parseFilesadded a strict switch expecting{'coverage': [...]}reports and throwingFormatExceptionon anything else, including{}. This causedformat_coverageto crash when processing output fromdart test --coverageon suites with skipped tests.Changes
pkgs/coverage/lib/src/hitmap.dart: InHitMap.parseFiles, allow an emptyMap({}) so empty files from skipped suites are treated as empty reports instead of throwing aFormatException.pkgs/coverage/test/chrome_test.dart: Remove'{}'from the invalid JSON rejection list and add a test verifyingHitMap.parseFilesaccepts an empty JSON file.pkgs/coverage/test/collect_coverage_test.dart: Add a test verifyingHitMap.parseFileshandles empty JSON reports.pkgs/coverageversion to1.16.1-wipand updateCHANGELOG.md.Fixes #2667
Verification
dart analyze --fatal-infos(0 issues)dart format --output=none --set-exit-if-changed .(0 changed)dart test test/collect_coverage_test.dart(all passed)dart test test/format_coverage_test.dart test/util_test.dart test/resolver_test.dart test/lcov_test.dart ...(all passed)