Add stream event table renderer

1 files changed, 73 insertions, 0 deletions

diff --git a/internal/tui/eventstream/render_test.go b/internal/tui/eventstream/render_test.go
new file mode 100644
index 0000000..5f037ab
--- /dev/null
+++ b/internal/tui/eventstream/render_test.go
@@ -0,0 +1,73 @@
+package eventstream
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestRenderStatusAndFilterLines(t *testing.T) {
+	events := []StreamEvent{{Syscall: "read", Comm: "nginx", PID: 1, TID: 2, DurationNs: 1200, GapNs: 300, Bytes: 64, FileName: "/tmp/a", RetVal: 64}}
+	f := Filter{Syscall: &StringFilter{Pattern: "read"}, PID: &NumericFilter{Op: OpEq, Value: 1}}
+	out := RenderStreamTable(120, false, 100, 1, 100, 10000, f, events)
+
+	for _, want := range []string{"LIVE", "total:100", "filtered:1", "buffer:100/10000", "Filter:", "syscall~read", "pid=1"} {
+		if !strings.Contains(out, want) {
+			t.Fatalf("output missing %q\n%s", want, out)
+		}
+	}
+}
+
+func TestRenderPausedAndErrorRow(t *testing.T) {
+	events := []StreamEvent{{Syscall: "write", Comm: "worker", PID: 1, TID: 2, DurationNs: 1000000, GapNs: 5000, Bytes: 32, FileName: "/tmp/b", RetVal: -1, IsError: true}}
+	out := RenderStreamTable(120, true, 10, 1, 10, 10000, Filter{}, events)
+
+	if !strings.Contains(out, "PAUSED") {
+		t.Fatalf("expected PAUSED indicator\n%s", out)
+	}
+	if !strings.Contains(out, "-1") {
+		t.Fatalf("expected return value in row\n%s", out)
+	}
+	if !strings.Contains(out, "worker") || !strings.Contains(out, "write") {
+		t.Fatalf("expected event row in output\n%s", out)
+	}
+}
+
+func TestRenderHeaderAndTruncate(t *testing.T) {
+	events := []StreamEvent{{
+		Syscall:    "very_long_syscall_name",
+		Comm:       "very-long-command-name",
+		PID:        1,
+		TID:        2,
+		DurationNs: 2_000_000,
+		GapNs:      100,
+		Bytes:      4096,
+		FileName:   "/very/long/path/that/should/be/truncated/for/narrow/views/file.log",
+		RetVal:     1,
+	}}
+	out := RenderStreamTable(80, false, 1, 1, 1, 10000, Filter{}, events)
+
+	for _, col := range []string{"Gap", "Latency", "Comm", "PID.TID", "Syscall", "Ret", "Bytes", "File"} {
+		if !strings.Contains(out, col) {
+			t.Fatalf("missing column %q\n%s", col, out)
+		}
+	}
+	if !strings.Contains(out, "...") {
+		t.Fatalf("expected truncated field with ellipsis\n%s", out)
+	}
+}
+
+func TestFormatDurationNs(t *testing.T) {
+	cases := []struct {
+		in   uint64
+		want string
+	}{
+		{in: 999, want: "999ns"},
+		{in: 1500, want: "1.5us"},
+		{in: 2_000_000, want: "2.0ms"},
+	}
+	for _, tc := range cases {
+		if got := formatDurationNs(tc.in); got != tc.want {
+			t.Fatalf("formatDurationNs(%d) = %q, want %q", tc.in, got, tc.want)
+		}
+	}
+}