diff --git a/linter_test.go b/linter_test.go
index c32230a94..c14fbcc4c 100644
--- a/linter_test.go
+++ b/linter_test.go
@@ -634,6 +634,28 @@ func TestLinterRemoveRuleOnRulesCreatedHook(t *testing.T) {
 	}
 }
 
+func TestLinterGenerateDefaultConfigAlreadyExists(t *testing.T) {
+	l, err := NewLinter(io.Discard, &LinterOptions{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, n := range []string{"ok", "yml"} {
+		d := filepath.Join("testdata", "config", "projects", n)
+		testEnsureDotGitDir(d)
+
+		err := l.GenerateDefaultConfig(d)
+		if err == nil {
+			t.Fatal("error did not occur for project", d)
+		}
+		want := "config file already exists at"
+		msg := err.Error()
+		if !strings.Contains(msg, want) {
+			t.Fatalf("error message %q does not contain expected text %q", msg, want)
+		}
+	}
+}
+
 func BenchmarkLintWorkflowFiles(b *testing.B) {
 	large := filepath.Join("testdata", "bench", "many_scripts.yaml")
 	small := filepath.Join("testdata", "bench", "small.yaml")
diff --git a/project_test.go b/project_test.go
index e3b4d2676..ad80a71da 100644
--- a/project_test.go
+++ b/project_test.go
@@ -99,19 +99,21 @@ func TestProjectsDoesNotFindProjectFromOutside(t *testing.T) {
 	}
 }
 
-func TestProjectsLoadingProjectConfig(t *testing.T) {
-	d := filepath.Join("testdata", "config", "projects", "ok")
-	testEnsureDotGitDir(d)
-	ps := NewProjects()
-	p, err := ps.At(d)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if p == nil {
-		t.Fatal("project was not found at", d)
-	}
-	if c := p.Config(); c == nil {
-		t.Fatal("config was not found for directory", d)
+func TestProjectsLoadProjectConfig(t *testing.T) {
+	for _, n := range []string{"ok", "yml"} {
+		d := filepath.Join("testdata", "config", "projects", n)
+		testEnsureDotGitDir(d)
+		ps := NewProjects()
+		p, err := ps.At(d)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if p == nil {
+			t.Fatal("project was not found at", d)
+		}
+		if c := p.Config(); c == nil {
+			t.Fatal("config was not found for directory", d)
+		}
 	}
 }
 
diff --git a/testdata/config/projects/yml/.github/actionlint.yml b/testdata/config/projects/yml/.github/actionlint.yml
new file mode 100644
index 000000000..2617efc68
--- /dev/null
+++ b/testdata/config/projects/yml/.github/actionlint.yml
@@ -0,0 +1,3 @@
+self-hosted-runner:
+  labels: []
+config-variables: null
diff --git a/testdata/config/projects/yml/.github/workflows/test.yaml b/testdata/config/projects/yml/.github/workflows/test.yaml
new file mode 100644
index 000000000..f1787617a
--- /dev/null
+++ b/testdata/config/projects/yml/.github/workflows/test.yaml
@@ -0,0 +1,6 @@
+on: push
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo