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Bazel rules for using mockery

This is a relatively quick-and-dirty approach to try and bazelify Golang mocks generation using the third-party Mockery tool.

Contributions welcome! Feel free to open up PRs or raise issues.

Required dependencies

The gomockery.bzl file provides two rules that allow for Bazel-generated mock files for your Golang interfaces. In order for these rules to work correctly you will need to add the following dependencies to your own WORKSPACE file if they are not already present.

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "io_bazel_rules_go",
    urls = ["https://github.com/bazelbuild/rules_go/releases/download/0.16.5/rules_go-0.16.5.tar.gz"],
    sha256 = "7be7dc01f1e0afdba6c8eb2b43d2fa01c743be1b9273ab1eaf6c233df078d705",
)

load("@io_bazel_rules_go//go:def.bzl", "go_rules_dependencies", "go_register_toolchains")
go_rules_dependencies()
go_register_toolchains()

http_archive(
    name = "bazel_gazelle",
    urls = ["https://github.com/bazelbuild/bazel-gazelle/releases/download/0.16.0/bazel-gazelle-0.16.0.tar.gz"],
    sha256 = "7949fc6cc17b5b191103e97481cf8889217263acf52e00b560683413af204fcb",
)    

load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
gazelle_dependencies()

go_repository(
    name = "com_github_vektra_mockery",
    importpath = "github.com/vektra/mockery",
    tag = "e78b021dcbb558a8e7ac1fc5bc757ad7c277bb81",
)

go_repository(
    name = "com_github_stretchr_testify",
    importpath = "github.com/stretchr/testify",
    tag = "363ebb24d041ccea8068222281c2e963e997b9dc",
)

Rules

The rules that gomockery.bzl provides are:

  • go_mockery - Which generates the mocks for the interfaces exposed by the specified package. The arguments taken by this rule are:
    • name (optional) Name of the rule on which other go_* rules should depend if they want to include the generated mocks files. Default is go_default_mocks.
    • src (required) Label of the go_library in the sources of which should be looked for the interfaces to mock.
    • interfaces (required) Explicit list of the names of interfaces for which mocks should be generated.
    • case (optional) Casing of the file names that will be generated and contain the mocks (suppported values are underscore, camel, snake). Default is underscore.
    • outpkg (optional) Name of the package that will contain the mocks. Default is mocks.
    • mockery_tool (optional) Alternative label that builds the mockery binary that should be used instead of the default @com_github_vektra_mockery//cmd/mockery:mockery.
  • go_mockery_with_library - Which generates the mocks for the interfaces exposed by the specified package and compiles them into a go_library as well that can be depended on by other go_* rules. Besides exposing the same arguments as the go_mockery tool this rule also takes:
    • name (optional) Name of the rule that will correspond to the generated go_library. Default will be go_default_library.
    • mocks_name (optional) Name of the rule on which other go_* rules should depend if they want to include the generated mocks files. Default is go_default_mocks.
    • importpath (required) The Go package path with which the generated mocks package can be included from other Go files. It is passed as is through to the underlying go_library rule.
    • testify_mock_lib (optional) Alternative label that builds the github.com/stretchr/testify/mocks package on which the Go mocks library will need to depend. Will replace the default @com_github_stretchr_testify//mocks:go_default_library.

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