convert old script test to new script test

.github/workflows/ci.yml

@@ -43,16 +43,3 @@ jobs:
             echo "gofmt failed, please run gofmt -w ."
             exit 1
           fi
-
-  integration:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up Go
-        uses: actions/setup-go@v5
-        with:
-          go-version: 1.21
-
-      - name: Run integration tests
-        run: tests/local

testdata/scripts/local.txt

@@ -0,0 +1,17 @@
+# Normal usage clones dependabot-fixtures/go-modules-lib
+dependabot update go_modules dependabot-fixtures/go-modules-lib --cache cache
+stderr 'https://github.com:443/dependabot-fixtures/go-modules-lib/git-upload-pack'
+stdout 'create_pull_request'
+
+exec git clone https://github.com/dependabot-fixtures/go-modules-lib repo
+
+# Using --local prevents cloning
+dependabot update go_modules dependabot-fixtures/go-modules-lib --local repo --cache cache
+! stderr 'https://github.com:443/dependabot-fixtures/go-modules-lib/git-upload-pack'
+stdout 'create_pull_request'
+
+# Verify it works with a non-git repo
+rm -rf tmp/sys/.git
+dependabot update go_modules dependabot-fixtures/go-modules-lib --local repo --cache cache
+! stderr 'https://github.com:443/dependabot-fixtures/go-modules-lib/git-upload-pack'
+stdout 'create_pull_request'

tests/dependabot_test.go

@@ -8,6 +8,7 @@ import (
 	"os/exec"
 	"rsc.io/script"
 	"rsc.io/script/scripttest"
+	"sync"
 	"testing"
 )
 
@@ -39,7 +40,7 @@ func Commands() map[string]script.Cmd {
 	return commands
 }
 
-// Dependabot runs the Dependabot CLI. TODO Should this build once then execute thereafter?
+// Dependabot runs the Dependabot CLI.
 func Dependabot() script.Cmd {
 	return script.Command(
 		script.CmdUsage{
@@ -51,10 +52,21 @@ func Dependabot() script.Cmd {
 				return nil, script.ErrUsage
 			}
 
-			args = append([]string{"run", "../cmd/dependabot/dependabot.go"}, args...)
-			execCmd := exec.Command("go", args...)
+			sync.OnceFunc(func() {
+				err := exec.Command("go", "build", "../cmd/dependabot/dependabot.go").Run()
+				if err != nil {
+					panic("failed to build dependabot")
+				}
+				if err := os.Rename("dependabot", s.Getwd()+"/dependabot"); err != nil {
+					panic("failed to move dependabot into test directory")
+				}
+			})()
+
+			execCmd := exec.Command("./dependabot", args...)
 
 			var execOut, execErr bytes.Buffer
+			execCmd.Dir = s.Getwd()
+			execCmd.Env = s.Environ()
 			execCmd.Stdout = &execOut
 			execCmd.Stderr = &execErr