Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-11 02:16 UTC

TestableIO / System.IO.Abstractions

Just like System.Web.Abstractions, but for System.IO. Yay for testable IO access!

C#MIT★ 1,628 stars⑂ 260 forkssince Apr 2012View on GitHub ↗
#testing#mocks#dotnet#c-sharp#filesystem#io#cross-platform#tdd

TestableIO/System.IO.Abstractions holds a health index of 92 out of 100, placing it in the Excellent band. It scores highest on Vitality (94/100) and lowest on Security (62/100). It was last updated 1 day ago. 3 contributors account for most of its recent work.

92
overall / 100
Excellent

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

92
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 78 is calibrated to 92 on the published index scale (record calibration 2026-08-02).

Ownership

TestableIOOrganization
23 followers3 public repossince Jul 2018

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
NuGetSystem.IO.Abstractions.TestingHelpers22.2.0-46560 days agotesting
NuGetSystem.IO.Abstractions22.2.0-47560 days agotesting
NuGetTestableIO.System.IO.Abstractions.TestingHelpers22.2.0-6060 days agotesting
NuGetTestableIO.System.IO.Abstractions.Wrappers22.2.0-6160 days agotesting
NuGetTestableIO.System.IO.Abstractions22.2.0-6160 days agotesting

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

94Exceptional · 21% of overall

Development activity

95Exceptional
How it's scored
36/36Push recency — last push 1 days ago
31.2/36Commit cadence — 45/52 weeks with commits
18/18Commit volume — 180 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year180
human_commit_share0.07
days_since_last_push1
active_weeks_last_year45

Release discipline

92Excellent
How it's scored
27/27Ships releases — 100 releases published
36/36Release recency — latest release 60 days ago
19.8/27Release cadence — a release every ~56 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count100
latest_release_tagv22.2.0
releases_from_tagsno
days_since_latest_release60
mean_days_between_releases56
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

87Excellent · 17% of overall

Popularity & adoption

81Excellent
How it's scored
52.1/60Stars — 1,628 stars
20.1/25Forks — 260 forks
8.4/15Watchers — 33 watchers
Inputs used
forks260
stars1,628
watchers33
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

85Excellent
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (MIT)
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges5
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_servicesgithub.com, shields.io, sonarcloud.io
has_pull_request_templateno

Ecosystem adoption (downloads)

100Exceptional
How it's scored
80/80Total downloads — 334,149,470 downloads all-time across nuget
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagesSystem.IO.Abstractions.TestingHelpers, System.IO.Abstractions, TestableIO.System.IO.Abstractions.TestingHelpers, TestableIO.System.IO.Abstractions.Wrappers, TestableIO.System.IO.Abstractions
dependents—
ecosystemsnuget
total_downloads334,149,470
monthly_downloads—
unverified_packages_excluded—
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

76Good · 23% of overall

Maintainer resilience (bus factor)

76Good
How it's scored
36/54Bus factor — 3 contributor(s) cover half of all commits
16/22.5Commit distribution — top contributor authored 29% of commits
13.5/13.5Contributor breadth — 95 contributors
10/10OpenSSF Scorecard: Contributors — project has 23 contributing companies or organizations
Inputs used
bus_factor3
contributors_sampled95
top_contributor_share0.29

Issue & PR responsiveness

76Good
How it's scored
39.5/42Issue resolution — 94% of issues closed
26.4/30PR acceptance — 1,022/1,162 decided PRs merged
0/13Newcomer PR acceptance — no first-time contributor's PR decided in 30d
0/15OpenSSF Scorecard: Code-Review — Found 0/2 approved changesets -- score normalized to 0
Inputs used
merged_prs1,022
open_issues22
closed_issues347
prs_merged_7d0
prs_decided_7d0
prs_merged_30d0
prs_decided_30d0
issue_closed_ratio0.94
closed_unmerged_prs140
first_time_authors_30d0
first_time_prs_merged_30d0
first_time_prs_decided_30d0
Excluded from scoring (no data or not applicable): Newcomer PR acceptance. Remaining weights renormalized.

Ownership & stewardship

56Moderate
How it's scored
30/30Ownership backing — organization-owned
0/20Verified domain
9.9/25Owner reach — 23 followers of TestableIO
16.4/25Track record — 3 public repos, account ~8 yr old
Inputs used
followers23
owner_typeOrganization
is_verifiedno
owner_loginTestableIO
public_repos3
account_age_days2,990

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 5 package(s) on nuget
35/35Publish recency — latest publish 60 days ago
20/20Version history — 475 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagesSystem.IO.Abstractions.TestingHelpers, System.IO.Abstractions, TestableIO.System.IO.Abstractions.TestingHelpers, TestableIO.System.IO.Abstractions.Wrappers, TestableIO.System.IO.Abstractions
ecosystemsnuget
any_deprecatedno
min_days_since_publish60

Engineering Quality

Are baseline engineering and documentation practices in place?

70Good · 19% of overall

Engineering practices

74Good
How it's scored
24/24CI workflows — 2 workflow(s)
24/24Tests present
0/16Linter config
0/9.6Pre-commit hooks
6.4/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests — 30 out of 30 merged PRs checked by a CI test -- score normalized to 10
Inputs used
has_ciyes
has_testsyes
has_editorconfigyes
has_linter_configno
has_precommit_configno

Documentation

65Good
How it's scored
30/30README
0/25Documentation directory
15/15Documentation / homepage site — http://www.nuget.org/packages/System.IO.Abstractions
10/10Repository description
10/10Topics — 8 topics
0/10Wiki
Inputs used
topicstesting, mocks, dotnet, c-sharp, filesystem, io, cross-platform, tdd
has_wikino
homepagehttp://www.nuget.org/packages/System.IO.Abstractions
docs_sitehttp://www.nuget.org/packages/System.IO.Abstractions
has_readmeyes
has_docs_dirno
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

62Moderate · 16% of overall

Security posture

62Moderate
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
3/7.5Branch-Protection — branch protection is not maximal on development and all release branches
2.5/2.5CI-Tests — 30 out of 30 merged PRs checked by a CI test -- score normalized to 10
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
0/7.5Code-Review — Found 0/2 approved changesets -- score normalized to 0
2.5/2.5Contributors — project has 23 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
7.5/7.5Dependency-Update-Tool — update tool detected
0/5Fuzzing — project is not fuzzed
2.5/2.5License — license file detected
7.5/7.5Maintained — 30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
5/5Packaging — packaging workflow detected
0/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
5/5SAST — SAST tool is run on all commits
0/5Security-Policy — security policy file not detected
0/7.5Signed-Releases — no data
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
7.5/7.5Vulnerabilities — 0 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated17
scorecard_versionv5.5.0
checks_inconclusive1
scorecard_aggregate6.2
Excluded from scoring (no data or not applicable): Signed-Releases. Remaining weights renormalized.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

74Good · 4% of overall

Agent context & guidance

75Good
How it's scored
45/45Agent instructions — .github/copilot-instructions.md
0/15Machine-readable docs (llms.txt)
0/40Legible commit history — no data
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share—
agent_instruction_files.github/copilot-instructions.md
agent_instruction_max_bytes6,707
Excluded from scoring (no data or not applicable): Legible commit history. Remaining weights renormalized.

Verify loop (build / test / typecheck)

64Moderate
How it's scored
12.6/18One-command bootstrap — Pipeline/Build.csproj, benchmarks/TestableIO.System.IO.Abstractions.Benchmarks/TestableIO.System.IO.Abstractions.Benchmarks.csproj, src/System.IO.Abstractions.TestingHelpers/System.IO.Abstractions.TestingHelpers.csproj (toolchain convention, no task runner)
22/22Automated tests
0/11Lint / format config
11/11Static type checking — C# (statically typed)
10/10Reproducible environment — devcontainer
0/10Demonstrated agent practice — no agent-authored commits among the last 100
8/8Automated maintenance — 92 of the last 100 commits are automated dependency updates
0/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
Inputs used
has_nixno
has_testsyes
lockfiles—
has_dockerfileno
typed_languageyes
bootstrap_files—
has_devcontaineryes
has_linter_configno
typecheck_configs—
agent_commit_share0
toolchain_manifestsPipeline/Build.csproj, benchmarks/TestableIO.System.IO.Abstractions.Benchmarks/TestableIO.System.IO.Abstractions.Benchmarks.csproj, src/System.IO.Abstractions.TestingHelpers/System.IO.Abstractions.TestingHelpers.csproj, src/System.IO.Abstractions/System.IO.Abstractions.csproj, src/TestableIO.System.IO.Abstractions.TestingHelpers/TestableIO.System.IO.Abstractions.TestingHelpers.csproj, src/TestableIO.System.IO.Abstractions.Wrappers/TestableIO.System.IO.Abstractions.Wrappers.csproj, src/TestableIO.System.IO.Abstractions/TestableIO.System.IO.Abstractions.csproj, tests/TestableIO.System.IO.Abstractions.Api.Tests/TestableIO.System.IO.Abstractions.Api.Tests.csproj, tests/TestableIO.System.IO.Abstractions.Parity.Tests/TestableIO.System.IO.Abstractions.Parity.Tests.csproj, tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests.csproj, tests/TestableIO.System.IO.Abstractions.Wrappers.Tests/TestableIO.System.IO.Abstractions.Wrappers.Tests.csproj
dependency_bot_commit_share0.92

Code legibility for models

100Exceptional
How it's scored
45/45Type-checkable code — C# (statically typed)
54.7/55Manageable file sizes — 1/161 source files over 60KB
Inputs used
primary_languageC#
largest_source_bytes81,829
source_files_sampled161
oversized_source_files1

Key facts

1,628GitHub stars
95contributors
180commits, last 12 months
1days since last push
100releases
3bus factor
22open issues
NuGetpackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • No resolved dependencies carried a version and a supported ecosystem

More detail

Star and fork history 0 ★ / 260 ⇿
0Stars
260Forks
98Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

05010015020025030025772012-052019-042026-04
Major 0Minor 1Patch 97

Each point covers 13 days.

OpenSSF Scorecard 6.2 / 10
6.2aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-09-11 02:16 UTC

10Binary-Artifactsno binaries found in the repo
4Branch-Protectionbranch protection is not maximal on development and all release branches
10CI-Tests30 out of 30 merged PRs checked by a CI test -- score normalized to 10
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
0Code-ReviewFound 0/2 approved changesets -- score normalized to 0
10Contributorsproject has 23 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
10Packagingpackaging workflow detected
0Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
10SASTSAST tool is run on all commits
0Security-Policysecurity policy file not detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
10Vulnerabilities0 existing vulnerabilities detected
Direct dependencies 9
RegistryPackageVersion constraintManifest
NuGetLibGit2Sharp—Pipeline/Build.csproj
NuGetFallout.Common—Pipeline/Build.csproj
NuGetFallout.Components—Pipeline/Build.csproj
NuGetSharpCompress—Pipeline/Build.csproj
NuGetTestably.Abstractions.FileSystem.Interface—src/TestableIO.System.IO.Abstractions.TestingHelpers/TestableIO.System.IO.Abstractions.TestingHelpers.csproj
NuGetSystem.IO.FileSystem.AccessControl—src/TestableIO.System.IO.Abstractions.Wrappers/TestableIO.System.IO.Abstractions.Wrappers.csproj
NuGetTestably.Abstractions.FileSystem.Interface—src/TestableIO.System.IO.Abstractions.Wrappers/TestableIO.System.IO.Abstractions.Wrappers.csproj
NuGetNullable—src/TestableIO.System.IO.Abstractions/TestableIO.System.IO.Abstractions.csproj
NuGetTestably.Abstractions.FileSystem.Interface—src/TestableIO.System.IO.Abstractions/TestableIO.System.IO.Abstractions.csproj
All dependencies 10

Full resolved dependency set from the GitHub dependency graph: 7 direct and 3 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
NuGetFallout.Common—direct
NuGetFallout.Components—direct
NuGetLibGit2Sharp—direct
NuGetNullable—direct
NuGetSharpCompress—direct
NuGetSystem.IO.FileSystem.AccessControl—direct
NuGetTestably.Abstractions.FileSystem.Interface—direct
NuGetBenchmarkDotNet—indirect
NuGetPublicApiGenerator—indirect
NuGetSystem.Text.Json—indirect
Dependency advisories not assessed

Advisory matching could not run for this report: No resolved dependencies carried a version and a supported ecosystem

Raw JSON report machine-readable

Feedback

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Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statistics — NuGet.