diff --git a/internal/miro/record.go b/internal/miro/record.go
index 4a0c4be..60df42a 100644
--- a/internal/miro/record.go
+++ b/internal/miro/record.go
@@ -37,11 +37,16 @@ func Record(path string) (string, error) {
 		return "", err
 	}
 
+	setupScripts, err := discoverSetupScripts(testDir, target)
+	if err != nil {
+		return "", err
+	}
+
 	if err := recordScenario(target, shellPath, recordIO{
 		in:  os.Stdin,
 		out: os.Stdout,
 		err: os.Stderr,
-	}, cfg.Sandbox); err != nil {
+	}, cfg.Sandbox, setupScripts); err != nil {
 		return "", err
 	}
 
diff --git a/internal/miro/record_session.go b/internal/miro/record_session.go
index ef2b274..dab90f6 100644
--- a/internal/miro/record_session.go
+++ b/internal/miro/record_session.go
@@ -17,7 +17,7 @@ type recordIO struct {
 	err io.Writer
 }
 
-func recordScenario(target, shellPath string, rio recordIO, sandboxConfig map[string]string) error {
+func recordScenario(target, shellPath string, rio recordIO, sandboxConfig map[string]string, setupScripts []string) error {
 	rawIn, rawOut, cleanup, err := newRecordFiles()
 	if err != nil {
 		return err
@@ -40,7 +40,7 @@ func recordScenario(target, shellPath string, rio recordIO, sandboxConfig map[st
 
 	output.Fprintln(rio.err, "Run commands in the recorder shell, then type exit to finish.")
 
-	if err := runRecordSession(target, rawIn, rawOut, shellPath, sandbox, rio, sandboxConfig); err != nil {
+	if err := runRecordSession(target, rawIn, rawOut, shellPath, sandbox, rio, sandboxConfig, setupScripts); err != nil {
 		return err
 	}
 
@@ -119,10 +119,10 @@ func newRecordSandboxForPathEnv(pathEnv string) (recordSandbox, func(), error) {
 	return sandbox, cleanup, nil
 }
 
-func runRecordSession(dir, rawIn, rawOut, shellPath string, sandbox recordSandbox, rio recordIO, sandboxConfig map[string]string) error {
+func runRecordSession(dir, rawIn, rawOut, shellPath string, sandbox recordSandbox, rio recordIO, sandboxConfig map[string]string, setupScripts []string) error {
 	cmd := exec.Command("script", "-q", "-E", "always", "-I", rawIn, "-O", rawOut, "-c", shellPath)
 	cmd.Dir = dir
-	cmd.Env = recordSessionEnv(sandbox, sandboxConfig)
+	cmd.Env = recordSessionEnv(sandbox, sandboxConfig, setupScripts)
 	cmd.Stdin = rio.in
 	cmd.Stdout = rio.out
 	cmd.Stderr = rio.err
diff --git a/internal/miro/record_shell.go b/internal/miro/record_shell.go
index 0017572..b0fdf19 100644
--- a/internal/miro/record_shell.go
+++ b/internal/miro/record_shell.go
@@ -79,16 +79,17 @@ func buildRecordShellScript() string {
 	return string(body)
 }
 
-func recordSessionEnv(sandbox recordSandbox, sandboxConfig map[string]string) []string {
-	return recordSessionEnvWithExtra(sandbox, sandboxConfig, nil)
+func recordSessionEnv(sandbox recordSandbox, sandboxConfig map[string]string, setupScripts []string) []string {
+	return recordSessionEnvWithExtra(sandbox, sandboxConfig, setupScripts, nil)
 }
 
-func recordSessionEnvWithExtra(sandbox recordSandbox, sandboxConfig, extraEnv map[string]string) []string {
+func recordSessionEnvWithExtra(sandbox recordSandbox, sandboxConfig map[string]string, setupScripts []string, extraEnv map[string]string) []string {
 	env := append([]string{}, os.Environ()...)
 	env = append(env,
 		"MIRO_HOST_HOME="+sandbox.hostHome,
 		"MIRO_HOST_TMP="+sandbox.hostTmp,
 		"MIRO_PATH_ENV="+sandbox.pathEnv,
+		setupScriptsEnvName+"="+strings.Join(setupScripts, "\n"),
 	)
 	for _, key := range sortedKeys(sandboxConfig) {
 		env = append(env, sandboxEnvName(key)+"="+sandboxConfig[key])
diff --git a/internal/miro/record_shell.sh b/internal/miro/record_shell.sh
index ee8b994..8a0c3b8 100644
--- a/internal/miro/record_shell.sh
+++ b/internal/miro/record_shell.sh
@@ -6,6 +6,20 @@ host_home=${MIRO_HOST_HOME:?}
 host_tmp=${MIRO_HOST_TMP:?}
 path_env=${MIRO_PATH_ENV:?}
 visible_home=${MIRO_VISIBLE_HOME:?}
+bootstrap_rc="$host_home/.miro-shell-rc"
+visible_bootstrap_rc="$visible_home/.miro-shell-rc"
+setup_scripts_dir='/tmp/miro-setup-scripts'
+
+cat >"$bootstrap_rc" <<'EOF'
+cd "${HOME:?}"
+
+for path in /tmp/miro-setup-scripts/*.sh; do
+  [ -e "$path" ] || continue
+  cd "${HOME:?}"
+  source "$path"
+  cd "${HOME:?}"
+done
+EOF
 
 if [ "${MIRO_COMPARE_MARKER:-0}" = "1" ]; then
   printf '__MIRO_E2E_BEGIN__\n'
@@ -32,4 +46,16 @@ set -- \
   --setenv TZ 'UTC' \
   --chdir "$visible_home"
 
-exec bwrap "$@" bash --noprofile --norc -i
+if [ -n "${MIRO_SETUP_SCRIPTS:-}" ]; then
+  i=1
+  while IFS= read -r host_path || [ -n "$host_path" ]; do
+    [ -n "$host_path" ] || continue
+    visible_path=$(printf '%s/%03d.sh' "$setup_scripts_dir" "$i")
+    set -- "$@" --ro-bind "$host_path" "$visible_path"
+    i=$((i + 1))
+  done <<EOF
+${MIRO_SETUP_SCRIPTS-}
+EOF
+fi
+
+exec bwrap "$@" bash --noprofile --rcfile "$visible_bootstrap_rc" -i
diff --git a/internal/miro/record_test.go b/internal/miro/record_test.go
index f078351..b5c5f39 100644
--- a/internal/miro/record_test.go
+++ b/internal/miro/record_test.go
@@ -59,7 +59,7 @@ func TestRecordReturnsDiscardedErrorWhenSaveDeclined(t *testing.T) {
 		target := filepath.Join(testDir, "a", "b", "c")
 		testutil.MustMkdirAll(t, target)
 		return withRecordStreams(t, "n\n", func(rio recordIO) error {
-			return recordScenario(target, recordShellPath(testDir), rio, defaultSandboxConfig())
+			return recordScenario(target, recordShellPath(testDir), rio, defaultSandboxConfig(), nil)
 		})
 	})
 
@@ -87,7 +87,7 @@ func TestRecordReturnsDiscardedErrorWhenOverwriteDeclined(t *testing.T) {
 
 	err := testutil.WithWorkingDir(t, root, func() error {
 		return withRecordStreams(t, "n\n", func(rio recordIO) error {
-			return recordScenario(target, recordShellPath(testDir), rio, defaultSandboxConfig())
+			return recordScenario(target, recordShellPath(testDir), rio, defaultSandboxConfig(), nil)
 		})
 	})
 
@@ -120,6 +120,17 @@ func TestBuildRecordShellScriptUsesExpectedCommands(t *testing.T) {
 		"host_tmp=${MIRO_HOST_TMP:?}",
 		"path_env=${MIRO_PATH_ENV:?}",
 		"visible_home=${MIRO_VISIBLE_HOME:?}",
+		"bootstrap_rc=\"$host_home/.miro-shell-rc\"",
+		"setup_scripts_dir='/tmp/miro-setup-scripts'",
+		"visible_bootstrap_rc=\"$visible_home/.miro-shell-rc\"",
+		"for path in /tmp/miro-setup-scripts/*.sh; do",
+		"source \"$path\"",
+		`if [ -n "${MIRO_SETUP_SCRIPTS:-}" ]; then`,
+		"i=1",
+		`while IFS= read -r host_path || [ -n "$host_path" ]; do`,
+		`visible_path=$(printf '%s/%03d.sh' "$setup_scripts_dir" "$i")`,
+		`set -- "$@" --ro-bind "$host_path" "$visible_path"`,
+		"${MIRO_SETUP_SCRIPTS-}",
 		`if [ "${MIRO_COMPARE_MARKER:-0}" = "1" ]; then`,
 		"printf '__MIRO_E2E_BEGIN__\\n'",
 		"--bind \"$host_home\" \"$visible_home\"",
@@ -130,7 +141,7 @@ func TestBuildRecordShellScriptUsesExpectedCommands(t *testing.T) {
 		"--setenv TERM 'xterm-256color'",
 		"--setenv TZ 'UTC'",
 		"--chdir \"$visible_home\"",
-		"exec bwrap \"$@\" bash --noprofile --norc -i",
+		"exec bwrap \"$@\" bash --noprofile --rcfile \"$visible_bootstrap_rc\" -i",
 	} {
 		if !strings.Contains(body, want) {
 			t.Fatalf("wrapper = %q, want substring %q", body, want)
@@ -146,7 +157,7 @@ func TestRecordSessionEnvIncludesConfiguredSandboxEnv(t *testing.T) {
 	}, map[string]string{
 		"visible_home": "/sandbox/home",
 		"key_word":     "value",
-	})
+	}, []string{"/repo/e2e/setup.sh", "/repo/e2e/suite/setup.sh"})
 
 	for _, want := range []string{
 		"MIRO_HOST_HOME=/tmp/host-home",
@@ -154,11 +165,15 @@ func TestRecordSessionEnvIncludesConfiguredSandboxEnv(t *testing.T) {
 		"MIRO_PATH_ENV=/tmp/bin",
 		"MIRO_KEY_WORD=value",
 		"MIRO_VISIBLE_HOME=/sandbox/home",
+		"MIRO_SETUP_SCRIPTS=/repo/e2e/setup.sh\n/repo/e2e/suite/setup.sh",
 	} {
 		if !containsEnvEntry(env, want) {
 			t.Fatalf("env = %#v, want entry %q", env, want)
 		}
 	}
+	if containsEnvKey(env, "MIRO_SETUP_SCRIPT_BINDS") {
+		t.Fatalf("env = %#v, want MIRO_SETUP_SCRIPT_BINDS omitted", env)
+	}
 }
 
 func TestRecordSessionEnvWithExtraIncludesAdditionalEntries(t *testing.T) {
@@ -168,7 +183,7 @@ func TestRecordSessionEnvWithExtraIncludesAdditionalEntries(t *testing.T) {
 		pathEnv:  "/tmp/bin",
 	}, map[string]string{
 		"visible_home": "/sandbox/home",
-	}, map[string]string{
+	}, []string{"/repo/e2e/setup.sh"}, map[string]string{
 		compareMarkerEnvName: compareMarkerEnabledValue,
 	})
 
@@ -177,12 +192,16 @@ func TestRecordSessionEnvWithExtraIncludesAdditionalEntries(t *testing.T) {
 		"MIRO_HOST_TMP=/tmp/host-tmp",
 		"MIRO_PATH_ENV=/tmp/bin",
 		"MIRO_VISIBLE_HOME=/sandbox/home",
+		"MIRO_SETUP_SCRIPTS=/repo/e2e/setup.sh",
 		"MIRO_COMPARE_MARKER=1",
 	} {
 		if !containsEnvEntry(env, want) {
 			t.Fatalf("env = %#v, want entry %q", env, want)
 		}
 	}
+	if containsEnvKey(env, "MIRO_SETUP_SCRIPT_BINDS") {
+		t.Fatalf("env = %#v, want MIRO_SETUP_SCRIPT_BINDS omitted", env)
+	}
 }
 
 func TestRunRecordSessionUsesSandboxedScriptCommand(t *testing.T) {
@@ -203,40 +222,46 @@ func TestRunRecordSessionUsesSandboxedScriptCommand(t *testing.T) {
 
 	shellPath := recordShellPath(testDir)
 	err = withRecordStreams(t, "", func(rio recordIO) error {
-		return runRecordSession(t.TempDir(), filepath.Join(t.TempDir(), "raw.in"), filepath.Join(t.TempDir(), "raw.out"), shellPath, sandbox, rio, defaultSandboxConfig())
+		return runRecordSession(t.TempDir(), filepath.Join(t.TempDir(), "raw.in"), filepath.Join(t.TempDir(), "raw.out"), shellPath, sandbox, rio, defaultSandboxConfig(), []string{"/repo/e2e/setup.sh"})
 	})
 	if err != nil {
 		t.Fatalf("runRecordSession() error = %v", err)
 	}
 
 	args := strings.Split(strings.TrimSpace(testutil.ReadFile(t, argsPath)), "\n")
-	if len(args) != 9 {
-		t.Fatalf("script args = %q, want 9 args", args)
+	if len(args) != 10 {
+		t.Fatalf("script args = %q, want 10 args", args)
 	}
-	if got := args[:4]; strings.Join(got, "\n") != strings.Join([]string{"-q", "-E", "always", "-I"}, "\n") {
-		t.Fatalf("script args prefix = %q, want %q", got, []string{"-q", "-E", "always", "-I"})
+	if got := args[:5]; strings.Join(got, "\n") != strings.Join([]string{"-q", "-e", "-E", "always", "-I"}, "\n") {
+		t.Fatalf("script args prefix = %q, want %q", got, []string{"-q", "-e", "-E", "always", "-I"})
 	}
-	if args[5] != "-O" {
-		t.Fatalf("script args[5] = %q, want %q", args[5], "-O")
+	if args[6] != "-O" {
+		t.Fatalf("script args[6] = %q, want %q", args[6], "-O")
 	}
-	if args[7] != "-c" {
-		t.Fatalf("script args[7] = %q, want %q", args[7], "-c")
+	if args[8] != "-c" {
+		t.Fatalf("script args[8] = %q, want %q", args[8], "-c")
 	}
-	if args[8] != shellPath {
-		t.Fatalf("script args[8] = %q, want %q", args[8], shellPath)
+	if args[9] != shellPath {
+		t.Fatalf("script args[9] = %q, want %q", args[9], shellPath)
 	}
 
 	body := testutil.ReadFile(t, commandBodyPath)
 	for _, want := range []string{
 		"host_home=${MIRO_HOST_HOME:?}",
 		"visible_home=${MIRO_VISIBLE_HOME:?}",
+		"bootstrap_rc=\"$host_home/.miro-shell-rc\"",
+		"visible_bootstrap_rc=\"$visible_home/.miro-shell-rc\"",
+		"for path in /tmp/miro-setup-scripts/*.sh; do",
+		"source \"$path\"",
+		`if [ -n "${MIRO_SETUP_SCRIPTS:-}" ]; then`,
+		`set -- "$@" --ro-bind "$host_path" "$visible_path"`,
 		`if [ "${MIRO_COMPARE_MARKER:-0}" = "1" ]; then`,
 		"printf '__MIRO_E2E_BEGIN__\\n'",
 		"--ro-bind / /",
 		"--tmpfs /home",
 		"--setenv HOME \"$visible_home\"",
 		"--setenv TMPDIR '/tmp'",
-		"exec bwrap \"$@\" bash --noprofile --norc -i",
+		"exec bwrap \"$@\" bash --noprofile --rcfile \"$visible_bootstrap_rc\" -i",
 	} {
 		if !strings.Contains(body, want) {
 			t.Fatalf("wrapper = %q, want substring %q", body, want)
@@ -293,7 +318,7 @@ func TestRecordScenarioUsesDeterministicSandbox(t *testing.T) {
 			in:  reader,
 			out: ioDiscard{},
 			err: &bytes.Buffer{},
-		}, sandboxConfig)
+		}, sandboxConfig, nil)
 	})
 	if err != nil {
 		t.Fatalf("recordScenario() error = %v", err)
diff --git a/internal/miro/setup_scripts.go b/internal/miro/setup_scripts.go
new file mode 100644
index 0000000..65d9698
--- /dev/null
+++ b/internal/miro/setup_scripts.go
@@ -0,0 +1,61 @@
+package miro
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	setupScriptName     = "setup.sh"
+	setupScriptsEnvName = "MIRO_SETUP_SCRIPTS"
+)
+
+func discoverSetupScripts(testDir, scenarioDir string) ([]string, error) {
+	absTestDir, err := filepath.Abs(testDir)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve test directory path: %v", err)
+	}
+
+	absScenarioDir, err := filepath.Abs(scenarioDir)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve scenario directory path: %v", err)
+	}
+
+	relToTestDir, err := filepath.Rel(absTestDir, absScenarioDir)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve scenario directory %q: %v", absScenarioDir, err)
+	}
+	if !isWithinBase(relToTestDir) {
+		return nil, fmt.Errorf("scenario directory %q must be inside test directory %q", absScenarioDir, absTestDir)
+	}
+
+	dirs := []string{absTestDir}
+	if relToTestDir != "." {
+		current := absTestDir
+		for _, part := range strings.Split(relToTestDir, string(os.PathSeparator)) {
+			current = filepath.Join(current, part)
+			dirs = append(dirs, current)
+		}
+	}
+
+	scripts := make([]string, 0, len(dirs))
+	for _, dir := range dirs {
+		path := filepath.Join(dir, setupScriptName)
+		info, err := os.Stat(path)
+		if err == nil {
+			if info.IsDir() {
+				return nil, fmt.Errorf("setup fixture %q is a directory", path)
+			}
+			scripts = append(scripts, path)
+			continue
+		}
+		if !errors.Is(err, os.ErrNotExist) {
+			return nil, fmt.Errorf("failed to check setup fixture %q: %v", path, err)
+		}
+	}
+
+	return scripts, nil
+}
diff --git a/internal/miro/setup_scripts_test.go b/internal/miro/setup_scripts_test.go
new file mode 100644
index 0000000..eb2bf96
--- /dev/null
+++ b/internal/miro/setup_scripts_test.go
@@ -0,0 +1,35 @@
+package miro
+
+import (
+	"path/filepath"
+	"testing"
+
+	"miro/internal/testutil"
+)
+
+func TestDiscoverSetupScriptsFindsRootToLeafSetupFiles(t *testing.T) {
+	testDir := filepath.Join(t.TempDir(), "e2e")
+	scenarioDir := filepath.Join(testDir, "suite", "spec")
+	rootSetup := filepath.Join(testDir, setupScriptName)
+	suiteSetup := filepath.Join(testDir, "suite", setupScriptName)
+	scenarioSetup := filepath.Join(scenarioDir, setupScriptName)
+
+	testutil.WriteFile(t, rootSetup, "export ROOT=1\n")
+	testutil.WriteFile(t, suiteSetup, "export SUITE=1\n")
+	testutil.WriteFile(t, scenarioSetup, "export SPEC=1\n")
+
+	got, err := discoverSetupScripts(testDir, scenarioDir)
+	if err != nil {
+		t.Fatalf("discoverSetupScripts() error = %v", err)
+	}
+
+	want := []string{rootSetup, suiteSetup, scenarioSetup}
+	if len(got) != len(want) {
+		t.Fatalf("len(discoverSetupScripts()) = %d, want %d", len(got), len(want))
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("discoverSetupScripts()[%d] = %q, want %q", i, got[i], want[i])
+		}
+	}
+}
diff --git a/internal/miro/test.go b/internal/miro/test.go
index 8f8a95b..afbd08c 100644
--- a/internal/miro/test.go
+++ b/internal/miro/test.go
@@ -20,10 +20,11 @@ type testIO struct {
 }
 
 type testScenario struct {
-	dir     string
-	relPath string
-	inPath  string
-	outPath string
+	dir          string
+	relPath      string
+	inPath       string
+	outPath      string
+	setupScripts []string
 }
 
 type testSummary struct {
@@ -181,6 +182,10 @@ func discoverTestScenarios(discoveryRoot, displayRoot string) ([]testScenario, e
 		if err != nil {
 			return nil, fmt.Errorf("failed to resolve scenario path for %q: %v", dir, err)
 		}
+		setupScripts, err := discoverSetupScripts(displayRoot, dir)
+		if err != nil {
+			return nil, err
+		}
 
 		switch {
 		case files.inPath == "":
@@ -190,10 +195,11 @@ func discoverTestScenarios(discoveryRoot, displayRoot string) ([]testScenario, e
 		}
 
 		scenarios = append(scenarios, testScenario{
-			dir:     dir,
-			relPath: relPath,
-			inPath:  files.inPath,
-			outPath: files.outPath,
+			dir:          dir,
+			relPath:      relPath,
+			inPath:       files.inPath,
+			outPath:      files.outPath,
+			setupScripts: setupScripts,
 		})
 	}
 
@@ -222,9 +228,9 @@ func replayScenario(scenario testScenario, shellPath string, _ testIO, sandboxCo
 	}
 	defer cleanupSandbox()
 
-	cmd := exec.Command("script", "-q", "-E", "always", "-O", rawOut, "-c", shellPath)
+	cmd := exec.Command("script", "-q", "-e", "-E", "always", "-O", rawOut, "-c", shellPath)
 	cmd.Dir = scenario.dir
-	cmd.Env = recordSessionEnvWithExtra(sandbox, sandboxConfig, map[string]string{
+	cmd.Env = recordSessionEnvWithExtra(sandbox, sandboxConfig, scenario.setupScripts, map[string]string{
 		compareMarkerEnvName: compareMarkerEnabledValue,
 	})
 	cmd.Stdin = bytes.NewReader(input)
diff --git a/internal/miro/test_test.go b/internal/miro/test_test.go
index 7b54962..65a3d2f 100644
--- a/internal/miro/test_test.go
+++ b/internal/miro/test_test.go
@@ -105,10 +105,11 @@ func TestReplayScenarioUsesRecordedInputAndKeepsReplayOutputQuiet(t *testing.T)
 	var stdout bytes.Buffer
 	var stderr bytes.Buffer
 	err := replayScenario(testScenario{
-		dir:     scenarioDir,
-		relPath: filepath.Join("suite", "spec"),
-		inPath:  filepath.Join(scenarioDir, "in"),
-		outPath: filepath.Join(scenarioDir, "out"),
+		dir:          scenarioDir,
+		relPath:      filepath.Join("suite", "spec"),
+		inPath:       filepath.Join(scenarioDir, "in"),
+		outPath:      filepath.Join(scenarioDir, "out"),
+		setupScripts: nil,
 	}, shellPath, testIO{
 		out: &stdout,
 		err: &stderr,
@@ -139,10 +140,11 @@ func TestReplayScenarioFailsWhenCompareMarkerMissing(t *testing.T) {
 	testutil.WriteScenarioFixtures(t, scenarioDir, "echo replay\nexit\n", "echo replay\nexit\n")
 
 	err := replayScenario(testScenario{
-		dir:     scenarioDir,
-		relPath: filepath.Join("suite", "spec"),
-		inPath:  filepath.Join(scenarioDir, "in"),
-		outPath: filepath.Join(scenarioDir, "out"),
+		dir:          scenarioDir,
+		relPath:      filepath.Join("suite", "spec"),
+		inPath:       filepath.Join(scenarioDir, "in"),
+		outPath:      filepath.Join(scenarioDir, "out"),
+		setupScripts: nil,
 	}, shellPath, testIO{
 		out: &bytes.Buffer{},
 		err: &bytes.Buffer{},
@@ -158,6 +160,7 @@ func TestReplayScenarioFailsWhenCompareMarkerMissing(t *testing.T) {
 func TestDiscoverTestScenariosUsesDisplayRootForRelativePaths(t *testing.T) {
 	testDir := filepath.Join(t.TempDir(), "e2e")
 	scopedDir := filepath.Join(testDir, "nested")
+	testutil.WriteFile(t, filepath.Join(testDir, setupScriptName), "export ROOT=1\n")
 	testutil.WriteScenarioFixtures(t, filepath.Join(scopedDir, "b"), "echo two\n", "echo two\n")
 
 	got, err := discoverTestScenarios(scopedDir, testDir)
@@ -170,6 +173,9 @@ func TestDiscoverTestScenariosUsesDisplayRootForRelativePaths(t *testing.T) {
 	if got[0].relPath != filepath.Join("nested", "b") {
 		t.Fatalf("scenario relPath = %q, want %q", got[0].relPath, filepath.Join("nested", "b"))
 	}
+	if len(got[0].setupScripts) != 1 || got[0].setupScripts[0] != filepath.Join(testDir, setupScriptName) {
+		t.Fatalf("scenario setupScripts = %#v, want root setup", got[0].setupScripts)
+	}
 }
 
 func TestResolveTestDiscoveryRootRejectsMissingPath(t *testing.T) {
diff --git a/internal/miro/testhelpers_test.go b/internal/miro/testhelpers_test.go
index acccb10..7e285f0 100644
--- a/internal/miro/testhelpers_test.go
+++ b/internal/miro/testhelpers_test.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"miro/internal/testutil"
@@ -78,3 +79,14 @@ func containsEnvEntry(env []string, want string) bool {
 
 	return false
 }
+
+func containsEnvKey(env []string, key string) bool {
+	prefix := key + "="
+	for _, entry := range env {
+		if strings.HasPrefix(entry, prefix) {
+			return true
+		}
+	}
+
+	return false
+}