test: extend banner guard coverage

cmd/picoclaw/main.go

@@ -54,7 +54,6 @@ func NewPicoclawCommand() *cobra.Command {
 const (
 	colorBlue = "\033[1;38;2;62;93;185m"
 	colorRed  = "\033[1;38;2;213;70;70m"
-	noBannerEnv = "PICOCLAW_NO_BANNER"
 	banner    = "\r\n" +
 		colorBlue + "██████╗ ██╗ ██████╗ ██████╗ " + colorRed + " ██████╗██╗      █████╗ ██╗    ██╗\n" +
 		colorBlue + "██╔══██╗██║██╔════╝██╔═══██╗" + colorRed + "██╔════╝██║     ██╔══██╗██║    ██║\n" +
@@ -65,6 +64,8 @@ const (
 		"\033[0m\r\n"
 )
 
+const noBannerEnv = "PICOCLAW_NO_BANNER"
+
 func bannerDisabledByEnv() bool {
 	value := strings.TrimSpace(strings.ToLower(os.Getenv(noBannerEnv)))
 	switch value {

cmd/picoclaw/main_test.go

@@ -79,4 +79,23 @@ func TestShouldPrintBanner(t *testing.T) {
 		t.Setenv(noBannerEnv, "1")
 		assert.False(t, shouldPrintBanner([]string{"picoclaw", "agent"}, true))
 	})
+
+	t.Run("common truthy env values disable banner", func(t *testing.T) {
+		for _, value := range []string{"true", "yes", "on"} {
+			t.Run(value, func(t *testing.T) {
+				t.Setenv(noBannerEnv, value)
+				assert.False(t, shouldPrintBanner([]string{"picoclaw", "agent"}, true))
+			})
+		}
+	})
+
+	t.Run("root command still prints banner in terminal", func(t *testing.T) {
+		t.Setenv(noBannerEnv, "")
+		assert.True(t, shouldPrintBanner([]string{"picoclaw"}, true))
+	})
+
+	t.Run("unknown subcommand still prints banner in terminal", func(t *testing.T) {
+		t.Setenv(noBannerEnv, "")
+		assert.True(t, shouldPrintBanner([]string{"picoclaw", "unknown"}, true))
+	})
 }