test_chatty_parallel_success.txt

Documentation: cmd/go/testdata/script

     1# Run parallel chatty tests. Assert on CONT or NAME lines. This test makes sure that
     2# multiple parallel outputs have the appropriate test name lines between them.
     3go test -parallel 3 chatty_parallel_test.go -v
     4stdout -count=2 '^=== (CONT|NAME)  TestChattyParallel/sub-0\n    chatty_parallel_test.go:32: this is sub-0$'
     5stdout -count=2 '^=== (CONT|NAME)  TestChattyParallel/sub-1\n    chatty_parallel_test.go:32: this is sub-1$'
     6stdout -count=2 '^=== (CONT|NAME)  TestChattyParallel/sub-2\n    chatty_parallel_test.go:32: this is sub-2$'
     7
     8# Run parallel chatty tests with -json.
     9# Assert test2json has properly attributed output.
    10go test -json -parallel 3 chatty_parallel_test.go -v
    11stdout -count=2 '"Test":"TestChattyParallel/sub-0","Output":"    chatty_parallel_test.go:32: this is sub-0\\n"'
    12stdout -count=2 '"Test":"TestChattyParallel/sub-1","Output":"    chatty_parallel_test.go:32: this is sub-1\\n"'
    13stdout -count=2 '"Test":"TestChattyParallel/sub-2","Output":"    chatty_parallel_test.go:32: this is sub-2\\n"'
    14
    15-- chatty_parallel_test.go --
    16package chatty_parallel_test
    17
    18import (
    19	"testing"
    20	"fmt"
    21	"flag"
    22)
    23
    24// This test ensures the order of CONT lines in parallel chatty tests.
    25func TestChattyParallel(t *testing.T) {
    26	t.Parallel()
    27
    28	// The number of concurrent tests running. This is closely tied to the
    29	// -parallel test flag, so we grab it from the flag rather than setting it
    30	// to some constant.
    31	parallel := flag.Lookup("test.parallel").Value.(flag.Getter).Get().(int)
    32
    33	// ready is a synchronization mechanism that causes subtests to execute
    34	// round robin.
    35	ready := make([]chan bool, parallel)
    36	for i := range ready {
    37		ready[i] = make(chan bool, 1)
    38	}
    39	ready[0] <- true
    40
    41	for i := range ready {
    42		i := i
    43		t.Run(fmt.Sprintf("sub-%d", i), func(t *testing.T) {
    44			t.Parallel()
    45			for j := 0; j < 2; j++ {
    46				<-ready[i]
    47				t.Logf("this is sub-%d", i)
    48				ready[(i+1)%len(ready)] <- true
    49			}
    50		})
    51	}
    52}
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