1 files changed, 15 insertions, 3 deletions
diff --git a/internal/cli/cli_test.go b/internal/cli/cli_test.go
index 58b2d00..3b99562 100644
--- a/internal/cli/cli_test.go
+++ b/internal/cli/cli_test.go
@@ -375,10 +375,22 @@ func TestRandChapter(t *testing.T) {
 	}
 }
 
-func TestRandRejectsBT(t *testing.T) {
+func TestRandBTFallsBack(t *testing.T) {
+	// bt has no corpus but is accepted: --rand falls back to a corpus version
+	// and still prints a passage (exit 0), rather than erroring.
 	var out, errb bytes.Buffer
-	if code := Run([]string{"--rand-v", "-b", "bt"}, nil, &out, &errb); code != 2 {
-		t.Errorf("rand -b bt code=%d want 2 (stderr=%q)", code, errb.String())
+	if code := Run([]string{"--rand-v", "-b", "bt"}, nil, &out, &errb); code != 0 {
+		t.Errorf("rand -b bt code=%d want 0 (stderr=%q)", code, errb.String())
+	}
+	if strings.TrimSpace(out.String()) == "" {
+		t.Errorf("rand -b bt produced no output")
+	}
+}
+
+func TestRandRejectsUnknownVersion(t *testing.T) {
+	var out, errb bytes.Buffer
+	if code := Run([]string{"--rand-v", "-b", "xyz"}, nil, &out, &errb); code != 2 {
+		t.Errorf("rand -b xyz code=%d want 2 (stderr=%q)", code, errb.String())
 	}
 }