Compare prefixes ignoring case - #1870
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The prefix set was case sensitive, but the prefix maps to file names and NTFS and APFS are both case insensitive. Test methods Foo and foo passed the uniqueness check and then silently shared one set of snapshot files. A snapshot repository has to work on every platform, so the check now ignores case everywhere rather than only where the filesystem does.
This was referenced Aug 26, 2026
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Updated [Verify.XunitV3](https://github.com/VerifyTests/Verify) from 31.28.0 to 32.0.0. <details> <summary>Release notes</summary> _Sourced from [Verify.XunitV3's releases](https://github.com/VerifyTests/Verify/releases)._ ## 32.0.0 - [x] [#1832](VerifyTests/Verify#1832) Add Inline snpashot support - [x] [#1835](VerifyTests/Verify#1835) Add SettingsTask.AddContext - [x] [#1847](VerifyTests/Verify#1847) Honor explicit DefaultValueHandling for bools - [x] [#1850](VerifyTests/Verify#1850) Stray extension-less snapshot file crashes every run of its test - [x] [#1851](VerifyTests/Verify#1851) Static UniqueForTargetFramework(Assembly) overloads ignore the assembly passed to them - [x] [#1852](VerifyTests/Verify#1852) Appended files skip scrubbing and newline normalization when a stream converter is registered - [x] [#1853](VerifyTests/Verify#1853) IgnoreParameters() ignore-all sentinel is lost when combined with another ignore source - [x] [#1854](VerifyTests/Verify#1854) Format UTC offsets with the invariant culture - [x] [#1855](VerifyTests/Verify#1855) Format UTC offsets with invariant culture - [x] [#1856](VerifyTests/Verify#1856) Use ticks to decide date precision - [x] [#1857](VerifyTests/Verify#1857) Clean # out of file name parameters - [x] [#1858](VerifyTests/Verify#1858) Escape one character trimmed date formats - [x] [#1859](VerifyTests/Verify#1859) Prefer the exact type when resolving a member converter - [x] [#1860](VerifyTests/Verify#1860) Keep empty collections ignored alongside instance predicates - [x] [#1861](VerifyTests/Verify#1861) Key the combinations name cache by reference - [x] [#1862](VerifyTests/Verify#1862) Match MSTest overloads against the test data - [x] [#1863](VerifyTests/Verify#1863) Report deletes as directory relative paths - [x] [#1864](VerifyTests/Verify#1864) Name the guarded API in ThrowIfVerifyHasBeenRun - [x] [#1865](VerifyTests/Verify#1865) Keep stack frames that have no parameter list - [x] [#1866](VerifyTests/Verify#1866) Generate the TestContext property for record test classes - [x] [#1867](VerifyTests/Verify#1867) Fix two CombinationResultsConverter edge cases - [x] [#1868](VerifyTests/Verify#1868) Sign sub-hour UTC offsets - [x] [#1869](VerifyTests/Verify#1869) Write the received file from the stream for handle based FileStreams - [x] [#1870](VerifyTests/Verify#1870) Compare prefixes ignoring case - [x] [#1871](VerifyTests/Verify#1871) Guard the counter value caches with a lock - [x] [#1872](VerifyTests/Verify#1872) Sign sub-hour UTC offsets ## 32.0.0-beta.16 ## 32.0.0-beta.15 ## 32.0.0-beta.14 ## 32.0.0-beta.13 ## 32.0.0-beta.12 ## 32.0.0-beta.10 ## 32.0.0-beta.8 ## 32.0.0-beta.7 ## 32.0.0-beta.6 ## 32.0.0-beta.5 ## 32.0.0-beta.4 ## 32.0.0-beta.3 ## 32.0.0-beta.2 ## 32.0.0-beta.1 Commits viewable in [compare view](VerifyTests/Verify@31.28.0...32.0.0). </details> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore <dependency name> major version` will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself) - `@dependabot ignore <dependency name> minor version` will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself) - `@dependabot ignore <dependency name>` will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself) - `@dependabot unignore <dependency name>` will remove all of the ignore conditions of the specified dependency - `@dependabot unignore <dependency name> <ignore condition>` will remove the ignore condition of the specified dependency and ignore conditions </details> Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
This was referenced Aug 27, 2026
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PrefixUniquekept its set with the default (case sensitive) comparer, but the prefix maps to file names, and NTFS and APFS are both case insensitive. Two test methodsFooandfootherefore passed the uniqueness check and then silently shared one set of snapshot files, each overwriting the other's.The check now ignores case with
StringComparer.OrdinalIgnoreCase.A deliberate call: this applies on every platform, not only where the filesystem is case insensitive. On Linux the two prefixes really are distinct files, so this rejects something that would technically work there. That seems right for a snapshot repository — the files are committed and shared, so a pair that only differs in case is broken for everyone on Windows or macOS, and the failure should surface wherever it is authored rather than only in someone else's checkout. It is also consistent with
VerifyEngine, which already builds its delete set with an ignore-case comparer.DisableRequireUniquePrefix()remains the escape hatch.PrefixUniqueTestscovers both directions.Verify.Tests(1301),StaticSettingsTestsandVerify.NUnit.Testspass.