Package testing

func TestXxx(*testing.T)

package abs

import "testing"

func TestAbs(t *testing.T) {
    got := Abs(-1)
    if got != 1 {
        t.Errorf("Abs(-1) = %d; want 1", got)
    }
}

package abs_test

import (
	"testing"

	"path_to_pkg/abs"
)

func TestAbs(t *testing.T) {
    got := abs.Abs(-1)
    if got != 1 {
        t.Errorf("Abs(-1) = %d; want 1", got)
    }
}

func BenchmarkXxx(*testing.B)

func BenchmarkRandInt(b *testing.B) {
    for range b.N {
        rand.Int()
    }
}

BenchmarkRandInt-8   	68453040	        17.8 ns/op

func BenchmarkBigLen(b *testing.B) {
    big := NewBig()
    b.ResetTimer()
    for range b.N {
        big.Len()
    }
}

func BenchmarkTemplateParallel(b *testing.B) {
    templ := template.Must(template.New("test").Parse("Hello, {{.}}!"))
    b.RunParallel(func(pb *testing.PB) {
        var buf bytes.Buffer
        for pb.Next() {
            buf.Reset()
            templ.Execute(&buf, "World")
        }
    })
}

func ExampleHello() {
    fmt.Println("hello")
    // Output: hello
}

func ExampleSalutations() {
    fmt.Println("hello, and")
    fmt.Println("goodbye")
    // Output:
    // hello, and
    // goodbye
}

func ExamplePerm() {
    for _, value := range Perm(5) {
        fmt.Println(value)
    }
    // Unordered output: 4
    // 2
    // 1
    // 3
    // 0
}

func Example() { ... }
func ExampleF() { ... }
func ExampleT() { ... }
func ExampleT_M() { ... }

func Example_suffix() { ... }
func ExampleF_suffix() { ... }
func ExampleT_suffix() { ... }
func ExampleT_M_suffix() { ... }

func FuzzXxx(*testing.F)

func FuzzHex(f *testing.F) {
  for _, seed := range [][]byte{{}, {0}, {9}, {0xa}, {0xf}, {1, 2, 3, 4}} {
    f.Add(seed)
  }
  f.Fuzz(func(t *testing.T, in []byte) {
    enc := hex.EncodeToString(in)
    out, err := hex.DecodeString(enc)
    if err != nil {
      t.Fatalf("%v: decode: %v", in, err)
    }
    if !bytes.Equal(in, out) {
      t.Fatalf("%v: not equal after round trip: %v", in, out)
    }
  })
}

func TestTimeConsuming(t *testing.T) {
    if testing.Short() {
        t.Skip("skipping test in short mode.")
    }
    ...
}

func FuzzJSONMarshaling(f *testing.F) {
    f.Fuzz(func(t *testing.T, b []byte) {
        var v interface{}
        if err := json.Unmarshal(b, &v); err != nil {
            t.Skip()
        }
        if _, err := json.Marshal(v); err != nil {
            t.Errorf("Marshal: %v", err)
        }
    })
}

func TestFoo(t *testing.T) {
    // <setup code>
    t.Run("A=1", func(t *testing.T) { ... })
    t.Run("A=2", func(t *testing.T) { ... })
    t.Run("B=1", func(t *testing.T) { ... })
    // <tear-down code>
}

go test -run ''        # Run all tests.
go test -run Foo       # Run top-level tests matching "Foo", such as "TestFooBar".
go test -run Foo/A=    # For top-level tests matching "Foo", run subtests matching "A=".
go test -run /A=1      # For all top-level tests, run subtests matching "A=1".
go test -fuzz FuzzFoo  # Fuzz the target matching "FuzzFoo"

go test -run=FuzzFoo/9ddb952d9814

func TestGroupedParallel(t *testing.T) {
    for _, tc := range tests {
        tc := tc // capture range variable
        t.Run(tc.Name, func(t *testing.T) {
            t.Parallel()
            ...
        })
    }
}

func TestTeardownParallel(t *testing.T) {
    // This Run will not return until the parallel tests finish.
    t.Run("group", func(t *testing.T) {
        t.Run("Test1", parallelTest1)
        t.Run("Test2", parallelTest2)
        t.Run("Test3", parallelTest3)
    })
    // <tear-down code>
}

func TestMain(m *testing.M)

func TestMain(m *testing.M) {
	// call flag.Parse() here if TestMain uses flags
	m.Run()
}

func AllocsPerRun ¶ 1.1

func AllocsPerRun(runs int, f func()) (avg float64)

AllocsPerRun returns the average number of allocations during calls to f. Although the return value has type float64, it will always be an integral value.

To compute the number of allocations, the function will first be run once as a warm-up. The average number of allocations over the specified number of runs will then be measured and returned.

AllocsPerRun sets GOMAXPROCS to 1 during its measurement and will restore it before returning.

func CoverMode ¶ 1.8

func CoverMode() string

CoverMode reports what the test coverage mode is set to. The values are "set", "count", or "atomic". The return value will be empty if test coverage is not enabled.

func Coverage ¶ 1.4

func Coverage() float64

Coverage reports the current code coverage as a fraction in the range [0, 1]. If coverage is not enabled, Coverage returns 0.

When running a large set of sequential test cases, checking Coverage after each one can be useful for identifying which test cases exercise new code paths. It is not a replacement for the reports generated by 'go test -cover' and 'go tool cover'.

func Init ¶ 1.13

func Init()

Init registers testing flags. These flags are automatically registered by the "go test" command before running test functions, so Init is only needed when calling functions such as Benchmark without using "go test".

Init is not safe to call concurrently. It has no effect if it was already called.

func Main ¶

func Main(matchString func(pat, str string) (bool, error), tests []InternalTest, benchmarks []InternalBenchmark, examples []InternalExample)

Main is an internal function, part of the implementation of the "go test" command. It was exported because it is cross-package and predates "internal" packages. It is no longer used by "go test" but preserved, as much as possible, for other systems that simulate "go test" using Main, but Main sometimes cannot be updated as new functionality is added to the testing package. Systems simulating "go test" should be updated to use MainStart.

func RegisterCover ¶ 1.2

func RegisterCover(c Cover)

RegisterCover records the coverage data accumulators for the tests. NOTE: This function is internal to the testing infrastructure and may change. It is not covered (yet) by the Go 1 compatibility guidelines.

func RunBenchmarks ¶

func RunBenchmarks(matchString func(pat, str string) (bool, error), benchmarks []InternalBenchmark)

RunBenchmarks is an internal function but exported because it is cross-package; it is part of the implementation of the "go test" command.

func RunExamples ¶

func RunExamples(matchString func(pat, str string) (bool, error), examples []InternalExample) (ok bool)

RunExamples is an internal function but exported because it is cross-package; it is part of the implementation of the "go test" command.

func RunTests ¶

func RunTests(matchString func(pat, str string) (bool, error), tests []InternalTest) (ok bool)

RunTests is an internal function but exported because it is cross-package; it is part of the implementation of the "go test" command.

func Short ¶

func Short() bool

Short reports whether the -test.short flag is set.

func Testing ¶ 1.21

func Testing() bool

Testing reports whether the current code is being run in a test. This will report true in programs created by "go test", false in programs created by "go build".

func Verbose ¶ 1.1

func Verbose() bool

Verbose reports whether the -test.v flag is set.

type B ¶

B is a type passed to Benchmark functions to manage benchmark timing and to specify the number of iterations to run.

A benchmark ends when its Benchmark function returns or calls any of the methods FailNow, Fatal, Fatalf, SkipNow, Skip, or Skipf. Those methods must be called only from the goroutine running the Benchmark function. The other reporting methods, such as the variations of Log and Error, may be called simultaneously from multiple goroutines.

Like in tests, benchmark logs are accumulated during execution and dumped to standard output when done. Unlike in tests, benchmark logs are always printed, so as not to hide output whose existence may be affecting benchmark results.

type B struct {
    N int
    // contains filtered or unexported fields
}

func (*B) Cleanup ¶ 1.14

func (c *B) Cleanup(f func())

Cleanup registers a function to be called when the test (or subtest) and all its subtests complete. Cleanup functions will be called in last added, first called order.

func (*B) Elapsed ¶ 1.20

func (b *B) Elapsed() time.Duration

Elapsed returns the measured elapsed time of the benchmark. The duration reported by Elapsed matches the one measured by B.StartTimer, B.StopTimer, and B.ResetTimer.

func (*B) Error ¶

func (c *B) Error(args ...any)

Error is equivalent to Log followed by Fail.

func (*B) Errorf ¶

func (c *B) Errorf(format string, args ...any)

Errorf is equivalent to Logf followed by Fail.

func (*B) Fail ¶

func (c *B) Fail()

Fail marks the function as having failed but continues execution.

func (*B) FailNow ¶

func (c *B) FailNow()

FailNow marks the function as having failed and stops its execution by calling runtime.Goexit (which then runs all deferred calls in the current goroutine). Execution will continue at the next test or benchmark. FailNow must be called from the goroutine running the test or benchmark function, not from other goroutines created during the test. Calling FailNow does not stop those other goroutines.

func (*B) Failed ¶

func (c *B) Failed() bool

Failed reports whether the function has failed.

func (*B) Fatal ¶

func (c *B) Fatal(args ...any)

Fatal is equivalent to Log followed by FailNow.

func (*B) Fatalf ¶

func (c *B) Fatalf(format string, args ...any)

Fatalf is equivalent to Logf followed by FailNow.

func (*B) Helper ¶ 1.9

func (c *B) Helper()

Helper marks the calling function as a test helper function. When printing file and line information, that function will be skipped. Helper may be called simultaneously from multiple goroutines.

func (*B) Log ¶

func (c *B) Log(args ...any)

Log formats its arguments using default formatting, analogous to Println, and records the text in the error log. For tests, the text will be printed only if the test fails or the -test.v flag is set. For benchmarks, the text is always printed to avoid having performance depend on the value of the -test.v flag.

func (*B) Logf ¶

func (c *B) Logf(format string, args ...any)

Logf formats its arguments according to the format, analogous to Printf, and records the text in the error log. A final newline is added if not provided. For tests, the text will be printed only if the test fails or the -test.v flag is set. For benchmarks, the text is always printed to avoid having performance depend on the value of the -test.v flag.

func (*B) Name ¶ 1.8

func (c *B) Name() string

Name returns the name of the running (sub-) test or benchmark.

The name will include the name of the test along with the names of any nested sub-tests. If two sibling sub-tests have the same name, Name will append a suffix to guarantee the returned name is unique.

func (*B) ReportAllocs ¶ 1.1

func (b *B) ReportAllocs()

ReportAllocs enables malloc statistics for this benchmark. It is equivalent to setting -test.benchmem, but it only affects the benchmark function that calls ReportAllocs.

func (*B) ReportMetric ¶ 1.13

func (b *B) ReportMetric(n float64, unit string)

ReportMetric adds "n unit" to the reported benchmark results. If the metric is per-iteration, the caller should divide by b.N, and by convention units should end in "/op". ReportMetric overrides any previously reported value for the same unit. ReportMetric panics if unit is the empty string or if unit contains any whitespace. If unit is a unit normally reported by the benchmark framework itself (such as "allocs/op"), ReportMetric will override that metric. Setting "ns/op" to 0 will suppress that built-in metric.

// This reports a custom benchmark metric relevant to a
// specific algorithm (in this case, sorting).
testing.Benchmark(func(b *testing.B) {
    var compares int64
    for i := 0; i < b.N; i++ {
        s := []int{5, 4, 3, 2, 1}
        slices.SortFunc(s, func(a, b int) int {
            compares++
            return cmp.Compare(a, b)
        })
    }
    // This metric is per-operation, so divide by b.N and
    // report it as a "/op" unit.
    b.ReportMetric(float64(compares)/float64(b.N), "compares/op")
    // This metric is per-time, so divide by b.Elapsed and
    // report it as a "/ns" unit.
    b.ReportMetric(float64(compares)/float64(b.Elapsed().Nanoseconds()), "compares/ns")
})

// This reports a custom benchmark metric relevant to a
// specific algorithm (in this case, sorting) in parallel.
testing.Benchmark(func(b *testing.B) {
    var compares atomic.Int64
    b.RunParallel(func(pb *testing.PB) {
        for pb.Next() {
            s := []int{5, 4, 3, 2, 1}
            slices.SortFunc(s, func(a, b int) int {
                // Because RunParallel runs the function many
                // times in parallel, we must increment the
                // counter atomically to avoid racing writes.
                compares.Add(1)
                return cmp.Compare(a, b)
            })
        }
    })

    // NOTE: Report each metric once, after all of the parallel
    // calls have completed.

    // This metric is per-operation, so divide by b.N and
    // report it as a "/op" unit.
    b.ReportMetric(float64(compares.Load())/float64(b.N), "compares/op")
    // This metric is per-time, so divide by b.Elapsed and
    // report it as a "/ns" unit.
    b.ReportMetric(float64(compares.Load())/float64(b.Elapsed().Nanoseconds()), "compares/ns")
})

func (*B) ResetTimer ¶

func (b *B) ResetTimer()

ResetTimer zeroes the elapsed benchmark time and memory allocation counters and deletes user-reported metrics. It does not affect whether the timer is running.

func (*B) Run ¶ 1.7

func (b *B) Run(name string, f func(b *B)) bool

Run benchmarks f as a subbenchmark with the given name. It reports whether there were any failures.

A subbenchmark is like any other benchmark. A benchmark that calls Run at least once will not be measured itself and will be called once with N=1.

func (*B) RunParallel ¶ 1.3

func (b *B) RunParallel(body func(*PB))

RunParallel runs a benchmark in parallel. It creates multiple goroutines and distributes b.N iterations among them. The number of goroutines defaults to GOMAXPROCS. To increase parallelism for non-CPU-bound benchmarks, call B.SetParallelism before RunParallel. RunParallel is usually used with the go test -cpu flag.

The body function will be run in each goroutine. It should set up any goroutine-local state and then iterate until pb.Next returns false. It should not use the B.StartTimer, B.StopTimer, or B.ResetTimer functions, because they have global effect. It should also not call B.Run.

RunParallel reports ns/op values as wall time for the benchmark as a whole, not the sum of wall time or CPU time over each parallel goroutine.

// Parallel benchmark for text/template.Template.Execute on a single object.
testing.Benchmark(func(b *testing.B) {
    templ := template.Must(template.New("test").Parse("Hello, {{.}}!"))
    // RunParallel will create GOMAXPROCS goroutines
    // and distribute work among them.
    b.RunParallel(func(pb *testing.PB) {
        // Each goroutine has its own bytes.Buffer.
        var buf bytes.Buffer
        for pb.Next() {
            // The loop body is executed b.N times total across all goroutines.
            buf.Reset()
            templ.Execute(&buf, "World")
        }
    })
})

func (*B) SetBytes ¶

func (b *B) SetBytes(n int64)

SetBytes records the number of bytes processed in a single operation. If this is called, the benchmark will report ns/op and MB/s.

func (*B) SetParallelism ¶ 1.3

func (b *B) SetParallelism(p int)

SetParallelism sets the number of goroutines used by B.RunParallel to p*GOMAXPROCS. There is usually no need to call SetParallelism for CPU-bound benchmarks. If p is less than 1, this call will have no effect.

func (*B) Setenv ¶ 1.17

func (c *B) Setenv(key, value string)

Setenv calls os.Setenv(key, value) and uses Cleanup to restore the environment variable to its original value after the test.

Because Setenv affects the whole process, it cannot be used in parallel tests or tests with parallel ancestors.

func (*B) Skip ¶ 1.1

func (c *B) Skip(args ...any)

Skip is equivalent to Log followed by SkipNow.

func (*B) SkipNow ¶ 1.1

func (c *B) SkipNow()

SkipNow marks the test as having been skipped and stops its execution by calling runtime.Goexit. If a test fails (see Error, Errorf, Fail) and is then skipped, it is still considered to have failed. Execution will continue at the next test or benchmark. See also FailNow. SkipNow must be called from the goroutine running the test, not from other goroutines created during the test. Calling SkipNow does not stop those other goroutines.

func (*B) Skipf ¶ 1.1

func (c *B) Skipf(format string, args ...any)

Skipf is equivalent to Logf followed by SkipNow.

func (*B) Skipped ¶ 1.1

func (c *B) Skipped() bool

Skipped reports whether the test was skipped.

func (*B) StartTimer ¶

func (b *B) StartTimer()

StartTimer starts timing a test. This function is called automatically before a benchmark starts, but it can also be used to resume timing after a call to B.StopTimer.

func (*B) StopTimer ¶

func (b *B) StopTimer()

StopTimer stops timing a test. This can be used to pause the timer while performing complex initialization that you don't want to measure.

func (*B) TempDir ¶ 1.15

func (c *B) TempDir() string

TempDir returns a temporary directory for the test to use. The directory is automatically removed when the test and all its subtests complete. Each subsequent call to t.TempDir returns a unique directory; if the directory creation fails, TempDir terminates the test by calling Fatal.

type BenchmarkResult ¶

BenchmarkResult contains the results of a benchmark run.

type BenchmarkResult struct {
    N         int           // The number of iterations.
    T         time.Duration // The total time taken.
    Bytes     int64         // Bytes processed in one iteration.
    MemAllocs uint64        // The total number of memory allocations; added in Go 1.1
    MemBytes  uint64        // The total number of bytes allocated; added in Go 1.1

    // Extra records additional metrics reported by ReportMetric.
    Extra map[string]float64 // Go 1.13
}

func Benchmark ¶

func Benchmark(f func(b *B)) BenchmarkResult

Benchmark benchmarks a single function. It is useful for creating custom benchmarks that do not use the "go test" command.

If f depends on testing flags, then Init must be used to register those flags before calling Benchmark and before calling flag.Parse.

If f calls Run, the result will be an estimate of running all its subbenchmarks that don't call Run in sequence in a single benchmark.

func (BenchmarkResult) AllocedBytesPerOp ¶ 1.1

func (r BenchmarkResult) AllocedBytesPerOp() int64

AllocedBytesPerOp returns the "B/op" metric, which is calculated as r.MemBytes / r.N.

func (BenchmarkResult) AllocsPerOp ¶ 1.1

func (r BenchmarkResult) AllocsPerOp() int64

AllocsPerOp returns the "allocs/op" metric, which is calculated as r.MemAllocs / r.N.

func (BenchmarkResult) MemString ¶ 1.1

func (r BenchmarkResult) MemString() string

MemString returns r.AllocedBytesPerOp and r.AllocsPerOp in the same format as 'go test'.

func (BenchmarkResult) NsPerOp ¶

func (r BenchmarkResult) NsPerOp() int64

NsPerOp returns the "ns/op" metric.

func (BenchmarkResult) String ¶

func (r BenchmarkResult) String() string

String returns a summary of the benchmark results. It follows the benchmark result line format from https://golang.org/design/14313-benchmark-format, not including the benchmark name. Extra metrics override built-in metrics of the same name. String does not include allocs/op or B/op, since those are reported by BenchmarkResult.MemString.

type Cover ¶ 1.2

Cover records information about test coverage checking. NOTE: This struct is internal to the testing infrastructure and may change. It is not covered (yet) by the Go 1 compatibility guidelines.

type Cover struct {
    Mode            string
    Counters        map[string][]uint32
    Blocks          map[string][]CoverBlock
    CoveredPackages string
}

type CoverBlock ¶ 1.2

CoverBlock records the coverage data for a single basic block. The fields are 1-indexed, as in an editor: The opening line of the file is number 1, for example. Columns are measured in bytes. NOTE: This struct is internal to the testing infrastructure and may change. It is not covered (yet) by the Go 1 compatibility guidelines.

type CoverBlock struct {
    Line0 uint32 // Line number for block start.
    Col0  uint16 // Column number for block start.
    Line1 uint32 // Line number for block end.
    Col1  uint16 // Column number for block end.
    Stmts uint16 // Number of statements included in this block.
}

type F ¶ 1.18

F is a type passed to fuzz tests.

Fuzz tests run generated inputs against a provided fuzz target, which can find and report potential bugs in the code being tested.

A fuzz test runs the seed corpus by default, which includes entries provided by (*F).Add and entries in the testdata/fuzz/<FuzzTestName> directory. After any necessary setup and calls to (*F).Add, the fuzz test must then call (*F).Fuzz to provide the fuzz target. See the testing package documentation for an example, and see the F.Fuzz and F.Add method documentation for details.

*F methods can only be called before (*F).Fuzz. Once the test is executing the fuzz target, only (*T) methods can be used. The only *F methods that are allowed in the (*F).Fuzz function are (*F).Failed and (*F).Name.

type F struct {
    // contains filtered or unexported fields
}

func (*F) Add ¶ 1.18

func (f *F) Add(args ...any)

Add will add the arguments to the seed corpus for the fuzz test. This will be a no-op if called after or within the fuzz target, and args must match the arguments for the fuzz target.

func (*F) Cleanup ¶ 1.18

func (c *F) Cleanup(f func())

Cleanup registers a function to be called when the test (or subtest) and all its subtests complete. Cleanup functions will be called in last added, first called order.

func (*F) Error ¶ 1.18

func (c *F) Error(args ...any)

Error is equivalent to Log followed by Fail.

func (*F) Errorf ¶ 1.18

func (c *F) Errorf(format string, args ...any)

Errorf is equivalent to Logf followed by Fail.

func (*F) Fail ¶ 1.18

func (f *F) Fail()

Fail marks the function as having failed but continues execution.

func (*F) FailNow ¶ 1.18

func (c *F) FailNow()

FailNow marks the function as having failed and stops its execution by calling runtime.Goexit (which then runs all deferred calls in the current goroutine). Execution will continue at the next test or benchmark. FailNow must be called from the goroutine running the test or benchmark function, not from other goroutines created during the test. Calling FailNow does not stop those other goroutines.

func (*F) Failed ¶ 1.18

func (c *F) Failed() bool

Failed reports whether the function has failed.

func (*F) Fatal ¶ 1.18

func (c *F) Fatal(args ...any)

Fatal is equivalent to Log followed by FailNow.

func (*F) Fatalf ¶ 1.18

func (c *F) Fatalf(format string, args ...any)

Fatalf is equivalent to Logf followed by FailNow.

func (*F) Fuzz ¶ 1.18

func (f *F) Fuzz(ff any)

Fuzz runs the fuzz function, ff, for fuzz testing. If ff fails for a set of arguments, those arguments will be added to the seed corpus.

ff must be a function with no return value whose first argument is *T and whose remaining arguments are the types to be fuzzed. For example:

f.Fuzz(func(t *testing.T, b []byte, i int) { ... })

The following types are allowed: []byte, string, bool, byte, rune, float32, float64, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64. More types may be supported in the future.

ff must not call any *F methods, e.g. (*F).Log, (*F).Error, (*F).Skip. Use the corresponding *T method instead. The only *F methods that are allowed in the (*F).Fuzz function are (*F).Failed and (*F).Name.

This function should be fast and deterministic, and its behavior should not depend on shared state. No mutable input arguments, or pointers to them, should be retained between executions of the fuzz function, as the memory backing them may be mutated during a subsequent invocation. ff must not modify the underlying data of the arguments provided by the fuzzing engine.

When fuzzing, F.Fuzz does not return until a problem is found, time runs out (set with -fuzztime), or the test process is interrupted by a signal. F.Fuzz should be called exactly once, unless F.Skip or F.Fail is called beforehand.

func (*F) Helper ¶ 1.18

func (f *F) Helper()

Helper marks the calling function as a test helper function. When printing file and line information, that function will be skipped. Helper may be called simultaneously from multiple goroutines.

func (*F) Log ¶ 1.18

func (c *F) Log(args ...any)

Log formats its arguments using default formatting, analogous to Println, and records the text in the error log. For tests, the text will be printed only if the test fails or the -test.v flag is set. For benchmarks, the text is always printed to avoid having performance depend on the value of the -test.v flag.

func (*F) Logf ¶ 1.18

func (c *F) Logf(format string, args ...any)

Logf formats its arguments according to the format, analogous to Printf, and records the text in the error log. A final newline is added if not provided. For tests, the text will be printed only if the test fails or the -test.v flag is set. For benchmarks, the text is always printed to avoid having performance depend on the value of the -test.v flag.

func (*F) Name ¶ 1.18

func (c *F) Name() string

Name returns the name of the running (sub-) test or benchmark.

The name will include the name of the test along with the names of any nested sub-tests. If two sibling sub-tests have the same name, Name will append a suffix to guarantee the returned name is unique.

func (*F) Setenv ¶ 1.18

func (c *F) Setenv(key, value string)

Setenv calls os.Setenv(key, value) and uses Cleanup to restore the environment variable to its original value after the test.

Because Setenv affects the whole process, it cannot be used in parallel tests or tests with parallel ancestors.

func (*F) Skip ¶ 1.18

func (c *F) Skip(args ...any)

Skip is equivalent to Log followed by SkipNow.

func (*F) SkipNow ¶ 1.18

func (c *F) SkipNow()

SkipNow marks the test as having been skipped and stops its execution by calling runtime.Goexit. If a test fails (see Error, Errorf, Fail) and is then skipped, it is still considered to have failed. Execution will continue at the next test or benchmark. See also FailNow. SkipNow must be called from the goroutine running the test, not from other goroutines created during the test. Calling SkipNow does not stop those other goroutines.

func (*F) Skipf ¶ 1.18

func (c *F) Skipf(format string, args ...any)

Skipf is equivalent to Logf followed by SkipNow.

func (*F) Skipped ¶ 1.18

func (f *F) Skipped() bool

Skipped reports whether the test was skipped.

func (*F) TempDir ¶ 1.18

func (c *F) TempDir() string

TempDir returns a temporary directory for the test to use. The directory is automatically removed when the test and all its subtests complete. Each subsequent call to t.TempDir returns a unique directory; if the directory creation fails, TempDir terminates the test by calling Fatal.

type InternalBenchmark ¶

InternalBenchmark is an internal type but exported because it is cross-package; it is part of the implementation of the "go test" command.

type InternalBenchmark struct {
    Name string
    F    func(b *B)
}

type InternalExample ¶

type InternalExample struct {
    Name      string
    F         func()
    Output    string
    Unordered bool // Go 1.7
}

type InternalFuzzTarget ¶ 1.18

InternalFuzzTarget is an internal type but exported because it is cross-package; it is part of the implementation of the "go test" command.

type InternalFuzzTarget struct {
    Name string
    Fn   func(f *F)
}

type InternalTest ¶

InternalTest is an internal type but exported because it is cross-package; it is part of the implementation of the "go test" command.

type InternalTest struct {
    Name string
    F    func(*T)
}

type M ¶ 1.4

M is a type passed to a TestMain function to run the actual tests.

type M struct {
    // contains filtered or unexported fields
}

func MainStart ¶ 1.4

func MainStart(deps testDeps, tests []InternalTest, benchmarks []InternalBenchmark, fuzzTargets []InternalFuzzTarget, examples []InternalExample) *M

MainStart is meant for use by tests generated by 'go test'. It is not meant to be called directly and is not subject to the Go 1 compatibility document. It may change signature from release to release.

func (*M) Run ¶ 1.4

func (m *M) Run() (code int)

Run runs the tests. It returns an exit code to pass to os.Exit.

type PB ¶ 1.3

A PB is used by RunParallel for running parallel benchmarks.

type PB struct {
    // contains filtered or unexported fields
}

func (*PB) Next ¶ 1.3

func (pb *PB) Next() bool

Next reports whether there are more iterations to execute.

type T ¶

T is a type passed to Test functions to manage test state and support formatted test logs.

A test ends when its Test function returns or calls any of the methods FailNow, Fatal, Fatalf, SkipNow, Skip, or Skipf. Those methods, as well as the Parallel method, must be called only from the goroutine running the Test function.

The other reporting methods, such as the variations of Log and Error, may be called simultaneously from multiple goroutines.

type T struct {
    // contains filtered or unexported fields
}

func (*T) Cleanup ¶ 1.14

func (c *T) Cleanup(f func())

Cleanup registers a function to be called when the test (or subtest) and all its subtests complete. Cleanup functions will be called in last added, first called order.

func (*T) Deadline ¶ 1.15

func (t *T) Deadline() (deadline time.Time, ok bool)

Deadline reports the time at which the test binary will have exceeded the timeout specified by the -timeout flag.

The ok result is false if the -timeout flag indicates “no timeout” (0).

func (*T) Error ¶

func (c *T) Error(args ...any)

Error is equivalent to Log followed by Fail.

func (*T) Errorf ¶

func (c *T) Errorf(format string, args ...any)

Errorf is equivalent to Logf followed by Fail.

func (*T) Fail ¶

func (c *T) Fail()

Fail marks the function as having failed but continues execution.

func (*T) FailNow ¶

func (c *T) FailNow()

FailNow marks the function as having failed and stops its execution by calling runtime.Goexit (which then runs all deferred calls in the current goroutine). Execution will continue at the next test or benchmark. FailNow must be called from the goroutine running the test or benchmark function, not from other goroutines created during the test. Calling FailNow does not stop those other goroutines.

func (*T) Failed ¶

func (c *T) Failed() bool

Failed reports whether the function has failed.

func (*T) Fatal ¶

func (c *T) Fatal(args ...any)

Fatal is equivalent to Log followed by FailNow.

func (*T) Fatalf ¶

func (c *T) Fatalf(format string, args ...any)

Fatalf is equivalent to Logf followed by FailNow.

func (*T) Helper ¶ 1.9

func (c *T) Helper()

Helper marks the calling function as a test helper function. When printing file and line information, that function will be skipped. Helper may be called simultaneously from multiple goroutines.

func (*T) Log ¶

func (c *T) Log(args ...any)

Log formats its arguments using default formatting, analogous to Println, and records the text in the error log. For tests, the text will be printed only if the test fails or the -test.v flag is set. For benchmarks, the text is always printed to avoid having performance depend on the value of the -test.v flag.

func (*T) Logf ¶

func (c *T) Logf(format string, args ...any)

Logf formats its arguments according to the format, analogous to Printf, and records the text in the error log. A final newline is added if not provided. For tests, the text will be printed only if the test fails or the -test.v flag is set. For benchmarks, the text is always printed to avoid having performance depend on the value of the -test.v flag.

func (*T) Name ¶ 1.8

func (c *T) Name() string

Name returns the name of the running (sub-) test or benchmark.

The name will include the name of the test along with the names of any nested sub-tests. If two sibling sub-tests have the same name, Name will append a suffix to guarantee the returned name is unique.

func (*T) Parallel ¶

func (t *T) Parallel()

Parallel signals that this test is to be run in parallel with (and only with) other parallel tests. When a test is run multiple times due to use of -test.count or -test.cpu, multiple instances of a single test never run in parallel with each other.

func (*T) Run ¶ 1.7

func (t *T) Run(name string, f func(t *T)) bool

Run runs f as a subtest of t called name. It runs f in a separate goroutine and blocks until f returns or calls t.Parallel to become a parallel test. Run reports whether f succeeded (or at least did not fail before calling t.Parallel).

Run may be called simultaneously from multiple goroutines, but all such calls must return before the outer test function for t returns.

func (*T) Setenv ¶ 1.17

func (t *T) Setenv(key, value string)

Setenv calls os.Setenv(key, value) and uses Cleanup to restore the environment variable to its original value after the test.

Because Setenv affects the whole process, it cannot be used in parallel tests or tests with parallel ancestors.

func (*T) Skip ¶ 1.1

func (c *T) Skip(args ...any)

Skip is equivalent to Log followed by SkipNow.

func (*T) SkipNow ¶ 1.1

func (c *T) SkipNow()

SkipNow marks the test as having been skipped and stops its execution by calling runtime.Goexit. If a test fails (see Error, Errorf, Fail) and is then skipped, it is still considered to have failed. Execution will continue at the next test or benchmark. See also FailNow. SkipNow must be called from the goroutine running the test, not from other goroutines created during the test. Calling SkipNow does not stop those other goroutines.

func (*T) Skipf ¶ 1.1

func (c *T) Skipf(format string, args ...any)

Skipf is equivalent to Logf followed by SkipNow.

func (*T) Skipped ¶ 1.1

func (c *T) Skipped() bool

Skipped reports whether the test was skipped.

func (*T) TempDir ¶ 1.15

func (c *T) TempDir() string

TempDir returns a temporary directory for the test to use. The directory is automatically removed when the test and all its subtests complete. Each subsequent call to t.TempDir returns a unique directory; if the directory creation fails, TempDir terminates the test by calling Fatal.

type TB ¶ 1.2

TB is the interface common to T, B, and F.

type TB interface {
    Cleanup(func())
    Error(args ...any)
    Errorf(format string, args ...any)
    Fail()
    FailNow()
    Failed() bool
    Fatal(args ...any)
    Fatalf(format string, args ...any)
    Helper()
    Log(args ...any)
    Logf(format string, args ...any)
    Name() string
    Setenv(key, value string)
    Skip(args ...any)
    SkipNow()
    Skipf(format string, args ...any)
    Skipped() bool
    TempDir() string
    // contains filtered or unexported methods
}

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