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Easily measure code coverage of Golang binaries

Check out this blog post to see an example of Bincover is used, and how it works under the hood.



Package bincover provides an easy way to measure code coverage of Golang binaries. See examples/ to see how bincover is used to measure coverage of a simple Go application.



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var (
	ExitCode = 0


func RunTest

func RunTest(f func())

RunTest runs function f (usually main), with arguments specified by the flag "args-file", a file of newline-separated args. When f runs to completion (success or failure), RunTest prints (newline-separated): 1. f's output, 2. startOfMetadataMarker 3. a testMetadata struct 4. endOfMetadataMarker

Otherwise, if an unexpected error is encountered during execution, RunTest panics.


type CoverageCollector

type CoverageCollector struct {
	MergedCoverageFilename string
	CollectCoverage        bool
	// contains filtered or unexported fields

func NewCoverageCollector

func NewCoverageCollector(mergedCoverageFilename string, collectCoverage bool) *CoverageCollector

NewCoverageCollector initializes a CoverageCollector with the specified merged coverage filename. CollectCoverage can be set to true to collect coverage, or set to false to skip coverage collection. This is provided in order to enable reuse of CoverageCollector for tests where coverage measurement is not needed.

func (*CoverageCollector) RunBinary

func (c *CoverageCollector) RunBinary(binPath string, mainTestName string, env []string, args []string, options ...CoverageCollectorOption) (output string, exitCode int, err error)

RunBinary runs the instrumented binary at binPath with env environment variables, executing only the test with mainTestName with the specified args.

func (*CoverageCollector) Setup

func (c *CoverageCollector) Setup() error

func (*CoverageCollector) TearDown

func (c *CoverageCollector) TearDown() error

TearDown merges the coverage profiles collecting from repeated runs of RunBinary. It must be called at the teardown stage of the test suite, otherwise no merged coverage profile will be created.

type CoverageCollectorOption

type CoverageCollectorOption func(collector *CoverageCollector)

func PostExec

func PostExec(postCmdFuncs ...PostCmdFunc) CoverageCollectorOption

func PreExec

func PreExec(preCmdFuncs ...PreCmdFunc) CoverageCollectorOption

type PostCmdFunc

type PostCmdFunc func(cmd *exec.Cmd, output string, err error) error

type PreCmdFunc

type PreCmdFunc func(cmd *exec.Cmd) error


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