internal: validate live CLI mode behavior

1 files changed, 76 insertions, 0 deletions

diff --git a/internal/flags/flags_test.go b/internal/flags/flags_test.go
new file mode 100644
index 0000000..b4d47d2
--- /dev/null
+++ b/internal/flags/flags_test.go
@@ -0,0 +1,76 @@
+package flags
+
+import (
+	"flag"
+	"io"
+	"os"
+	"sync"
+	"testing"
+	"time"
+)
+
+func parseForTest(t *testing.T, args ...string) Flags {
+	t.Helper()
+
+	oldCommandLine := flag.CommandLine
+	oldArgs := os.Args
+	oldSingleton := singleton
+	oldOnce := once
+	oldPID := pidFilter.Load()
+	oldTID := tidFilter.Load()
+	oldTUIExport := tuiExportEnable.Load()
+
+	fs := flag.NewFlagSet("ior-test", flag.ContinueOnError)
+	fs.SetOutput(io.Discard)
+	flag.CommandLine = fs
+	os.Args = append([]string{"ior"}, args...)
+
+	singleton = Flags{TUIExportEnable: true}
+	once = sync.Once{}
+	pidFilter.Store(-1)
+	tidFilter.Store(-1)
+	tuiExportEnable.Store(true)
+
+	parse()
+	cfg := singleton
+
+	t.Cleanup(func() {
+		flag.CommandLine = oldCommandLine
+		os.Args = oldArgs
+		singleton = oldSingleton
+		once = oldOnce
+		pidFilter.Store(oldPID)
+		tidFilter.Store(oldTID)
+		tuiExportEnable.Store(oldTUIExport)
+	})
+
+	return cfg
+}
+
+func TestParseLiveFlagsAndInterval(t *testing.T) {
+	cfg := parseForTest(t, "-live", "-live-interval", "200ms", "-pid", "1234")
+
+	if !cfg.LiveFlamegraph {
+		t.Fatalf("expected -live to enable live mode")
+	}
+	if cfg.LiveInterval != 200*time.Millisecond {
+		t.Fatalf("live interval = %v, want %v", cfg.LiveInterval, 200*time.Millisecond)
+	}
+	if cfg.PidFilter != 1234 {
+		t.Fatalf("pid filter = %d, want 1234", cfg.PidFilter)
+	}
+	if got := int(pidFilter.Load()); got != 1234 {
+		t.Fatalf("global pid filter = %d, want 1234", got)
+	}
+}
+
+func TestParseLiveDefaults(t *testing.T) {
+	cfg := parseForTest(t)
+
+	if cfg.LiveFlamegraph {
+		t.Fatalf("expected live mode disabled by default")
+	}
+	if cfg.LiveInterval != time.Second {
+		t.Fatalf("default live interval = %v, want %v", cfg.LiveInterval, time.Second)
+	}
+}