feat(gno test): implement failfast flag

examples/Makefile

@@ -43,6 +43,10 @@ build:
 test:
 	go run ../gnovm/cmd/gno test -v ./...
 
+.PHONY: test.fast
+test:
+	go run ../gnovm/cmd/gno test -failfast -v  ./... 
+
 .PHONY: lint
 lint:
 	go run ../gnovm/cmd/gno tool lint -v $(OFFICIAL_PACKAGES)

gnovm/cmd/gno/test.go

@@ -20,6 +20,7 @@ import (
 
 type testCfg struct {
 	verbose             bool
+	failfast            bool
 	rootDir             string
 	run                 string
 	timeout             time.Duration
@@ -104,6 +105,13 @@ func (c *testCfg) RegisterFlags(fs *flag.FlagSet) {
 		"verbose output when running",
 	)
 
+	fs.BoolVar(
+		&c.failfast,
+		"failfast",
+		false,
+		"disables running additional tests after any test fails",
+	)
+
 	fs.BoolVar(
 		&c.updateGoldenTests,
 		"update-golden-tests",
@@ -246,6 +254,10 @@ func execTest(cfg *testCfg, args []string, io commands.IO) error {
 			io.ErrPrintfln("FAIL    %s \t%s", pkg.Dir, dstr)
 			io.ErrPrintfln("FAIL")
 			testErrCount++
+			if cfg.failfast {
+				io.ErrPrintfln("FAIL")
+				return fmt.Errorf("FAIL: %d build errors, %d test errors", buildErrCount, testErrCount)
+			}
 		} else {
 			io.ErrPrintfln("ok      %s \t%s", pkg.Dir, dstr)
 		}

gnovm/cmd/gno/testdata/test/flag_fail-fast.txtar

@@ -0,0 +1,38 @@
+# Test -failfast flag
+
+! gno test -failfast ./...
+
+! stdout .+
+stderr '--- FAIL: TestFail'
+stderr 'someError'
+! stderr 'secondError'
+
+
+-- one/failfast.gno --
+package one
+
+-- one/failfast_test.gno --
+package one
+
+import (
+	"testing"
+)
+
+func TestFail(t *testing.T) {
+	t.Error("someError")
+}
+
+-- two/failfast.gno --
+package two
+
+-- two/failfast_test.gno --
+package two
+
+import (
+	"testing"
+)
+
+func TestFail2(t *testing.T) {
+	t.Error("secondError")
+}
+