diff --git a/pkg/agent/loop_media_test.go b/pkg/agent/loop_media_test.go
index 58a168b71..613935c37 100644
--- a/pkg/agent/loop_media_test.go
+++ b/pkg/agent/loop_media_test.go
@@ -178,25 +178,26 @@ func TestProcessPDFs_NilOCR(t *testing.T) {
 	}
 }
 
+//nolint:gosmopolitan // intentional CJK test data for Japanese reading order detection
 func TestDetectReadingOrder(t *testing.T) {
 	tests := []struct {
 		content    string
 		cfgDefault string
 		want       string
 	}{
-		{"この文書を読んで", "", "auto"},
-		{"縦書きで読んで", "", "right2left"},
-		{"横書きのPDF", "", "top2bottom"},
+		{"\u3053\u306e\u6587\u66f8\u3092\u8aad\u3093\u3067", "", "auto"},
+		{"\u7e26\u66f8\u304d\u3067\u8aad\u3093\u3067", "", "right2left"},
+		{"\u6a2a\u66f8\u304d\u306ePDF", "", "top2bottom"},
 		{"vertical layout", "", "right2left"},
 		{"horizontal doc", "", "top2bottom"},
 		{"right2left please", "", "right2left"},
 		{"top2bottom mode", "", "top2bottom"},
 		{"left2right table", "", "left2right"},
-		{"たてがきの文書", "", "right2left"},
-		{"よこがきの文書", "", "top2bottom"},
+		{"\u305f\u3066\u304c\u304d\u306e\u6587\u66f8", "", "right2left"},
+		{"\u3088\u3053\u304c\u304d\u306e\u6587\u66f8", "", "top2bottom"},
 		{"plain message", "right2left", "right2left"},
 		{"plain message", "", "auto"},
-		{"縦書き", "top2bottom", "right2left"}, // message keyword overrides config default
+		{"\u7e26\u66f8\u304d", "top2bottom", "right2left"}, // message keyword overrides config default
 	}
 	for _, tt := range tests {
 		if got := detectReadingOrder(tt.content, tt.cfgDefault); got != tt.want {