tui: add dashboard syscalls table tab

1 files changed, 52 insertions, 0 deletions

diff --git a/internal/tui/dashboard/syscalls_test.go b/internal/tui/dashboard/syscalls_test.go
new file mode 100644
index 0000000..f998f74
--- /dev/null
+++ b/internal/tui/dashboard/syscalls_test.go
@@ -0,0 +1,52 @@
+package dashboard
+
+import (
+	"strings"
+	"testing"
+
+	"ior/internal/statsengine"
+)
+
+func TestRenderSyscallsIncludesHeaders(t *testing.T) {
+	snap := statsengine.NewSnapshot(
+		nil, nil, nil,
+		[]statsengine.SyscallSnapshot{
+			{Name: "write", Count: 5, RatePerSec: 1.2, Bytes: 1024, Errors: 1},
+			{Name: "read", Count: 10, RatePerSec: 2.4, Bytes: 2048, Errors: 0},
+		},
+		nil, nil,
+		statsengine.HistogramSnapshot{},
+		statsengine.HistogramSnapshot{},
+	)
+
+	out := renderSyscalls(&snap, 120, 30)
+	for _, token := range []string{"Syscall", "Count", "Rate/s", "p95", "Errors"} {
+		if !strings.Contains(out, token) {
+			t.Fatalf("expected token %q in syscall table view", token)
+		}
+	}
+	if !strings.Contains(out, "read") {
+		t.Fatalf("expected syscall row in output")
+	}
+}
+
+func TestFormatDurationNs(t *testing.T) {
+	if got := formatDurationNs(50); got != "50ns" {
+		t.Fatalf("unexpected ns formatting: %q", got)
+	}
+	if got := formatDurationNs(1500); !strings.Contains(got, "µs") {
+		t.Fatalf("expected µs formatting, got %q", got)
+	}
+	if got := formatDurationNs(2_500_000); !strings.Contains(got, "ms") {
+		t.Fatalf("expected ms formatting, got %q", got)
+	}
+}
+
+func TestClampOffset(t *testing.T) {
+	if got := clampOffset(-5, 10); got != 0 {
+		t.Fatalf("expected 0 for negative offset, got %d", got)
+	}
+	if got := clampOffset(99, 4); got != 3 {
+		t.Fatalf("expected max index clamp, got %d", got)
+	}
+}