golang-stretchr-testify

Comprehensive guide to stretchr/testify for Golang testing. Covers assert, require, mock, and suite packages in depth. Use when writing tests with testify, creating mocks, setting up test suites, or choosing between assert and require. Covers testify assertions, mock expectations, argument matchers, call verification, suite lifecycle, and advanced patterns like Eventually, JSONEq, and custom matchers. Apply when the codebase imports github.com/stretchr/testify.

1.92x

Quality

89%

Does it follow best practices?

Impact

81%

1.92x

Average score across 3 eval scenarios

Securityby

Passed

No findings from the security scan

Evaluation results

93%

33%

Retry Client Test Coverage

Mock call modifiers and detailed verification in retry tests

The agent wrote 165 files outside the evaluated workspace (Without this skill)

These are not visible to scoring or included in the download.

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/objx/@v/list

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/objx/@v/v0.5.3.info

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/objx/@v/v0.5.3.lock

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/objx/@v/v0.5.3.mod

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/objx/@v/v0.5.3.zip

The agent wrote 212 files outside the evaluated workspace (With this skill)

These are not visible to scoring or included in the download.

/home/agent/go/pkg/mod/cache/download/github.com/davecgh/go-spew/@v/list

/home/agent/go/pkg/mod/cache/download/github.com/davecgh/go-spew/@v/v1.1.1.info

/home/agent/go/pkg/mod/cache/download/github.com/davecgh/go-spew/@v/v1.1.1.lock

/home/agent/go/pkg/mod/cache/download/github.com/davecgh/go-spew/@v/v1.1.1.mod

/home/agent/go/pkg/mod/cache/download/github.com/davecgh/go-spew/@v/v1.1.1.zip

Criteria

Without this skill

With this skill

Mock embedding

100%

Chained Once expectations

100%

Run side effect

100%

AssertNumberOfCalls

100%

AssertNotCalled

100%

AssertExpectations on Fetcher

100%

AssertExpectations on Logger

100%

mock.Anything usage

100%

is naming

100%

must naming

85%

Testing the Product Search Service

Specialised testify assertions for mixed output types

The agent wrote 121 files outside the evaluated workspace (With this skill)

These are not visible to scoring or included in the download.

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/list

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.info

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.lock

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.mod

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.zip

Criteria

Without this skill

With this skill

ElementsMatch for IDs

100%

InDelta for rating

100%

JSONEq for summary

Regexp for RequestID

100%

Named assert wrapper

100%

Named require wrapper

100%

Require for error precondition

100%

Expected-first argument order

100%

66%

User Repository Error Testing

Error hierarchy testing with ErrorIs, ErrorAs, ErrorContains

The agent wrote 121 files outside the evaluated workspace (Without this skill)

These are not visible to scoring or included in the download.

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/list

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.info

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.lock

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.mod

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.zip

The agent wrote 123 files outside the evaluated workspace (With this skill)

These are not visible to scoring or included in the download.

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/list

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.info

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.lock

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.mod

/home/agent/go/pkg/mod/cache/download/github.com/stretchr/testify/@v/v1.12.1.zip

Criteria

Without this skill

With this skill

ErrorIs for sentinel

58%

100%

No Equal for wrapped error

100%

ErrorAs for type extraction

91%

100%

must.ErrorAs as precondition

90%

100%

Field inspection after ErrorAs

100%

ErrorContains for message substring

41%

16%

require for preconditions

100%

is := assert.New(t)

must := require.New(t)

Argument order (expected, actual)

100%

50%

Repository: samber/cc-skills-golang
Path: skills/golang-stretchr-testify/SKILL.md
Commit: 19a0626

Evaluated: 1 day ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Testing the Product Search Service Retry Client Test Coverage User Repository Error Testing

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