Export elapsed time to the post-run environment

README.md

@@ -146,6 +146,7 @@ TESTS_ERRORS            # number of errors
 TESTS_FAILED            # number of failed tests
 TESTS_SKIPPED           # number of skipped tests
 TESTS_TOTAL             # number of tests run
+TESTS_ELAPSED           # test time elapsed, in seconds
 ```
 
 To get more details about the test run, such as failure messages or the full list of failed

cmd/handler.go

@@ -166,6 +166,7 @@ func postRunHook(opts *options, execution *testjson.Execution) error {
 		fmt.Sprintf("TESTS_FAILED=%d", len(execution.Failed())),
 		fmt.Sprintf("TESTS_SKIPPED=%d", len(execution.Skipped())),
 		fmt.Sprintf("TESTS_ERRORS=%d", len(execution.Errors())),
+		fmt.Sprintf("TESTS_ELAPSED=%.3f", execution.Elapsed().Seconds()),
 	)
 	return cmd.Run()
 }

cmd/handler_test.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	"testing"
 
+	"gotest.tools/gotestsum/internal/text"
 	"gotest.tools/gotestsum/testjson"
 	"gotest.tools/v3/assert"
 	"gotest.tools/v3/env"
@@ -34,7 +35,15 @@ func TestPostRunHook(t *testing.T) {
 	exec := newExecFromTestData(t)
 	err = postRunHook(opts, exec)
 	assert.NilError(t, err)
-	golden.Assert(t, buf.String(), "post-run-hook-expected")
+
+	actual := text.ProcessLines(t, buf, func(line string) string {
+		if strings.HasPrefix(line, "TESTS_ELAPSED=0.0") {
+			i := strings.Index(line, "=")
+			return line[:i] + "=0.000"
+		}
+		return line
+	})
+	golden.Assert(t, actual, "post-run-hook-expected")
 }
 
 func newExecFromTestData(t *testing.T) *testjson.Execution {

cmd/testdata/post-run-hook-expected

@@ -2,6 +2,7 @@ GOTESTSUM_FORMAT=short
 GOTESTSUM_JSONFILE=events.json
 GOTESTSUM_JSONFILE_TIMING_EVENTS=timing.json
 GOTESTSUM_JUNITFILE=junit.xml
+TESTS_ELAPSED=0.000
 TESTS_ERRORS=0
 TESTS_FAILED=13
 TESTS_SKIPPED=5