From 9310b54d439d4a1a8d4d337987aa63884df0af76 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Wed, 20 May 2026 11:38:19 +0300
Subject: feat: add syscall aggregate sampling infrastructure (task 17)

---
 internal/syscall_aggregate_consumer_test.go | 53 +++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 internal/syscall_aggregate_consumer_test.go

(limited to 'internal/syscall_aggregate_consumer_test.go')

diff --git a/internal/syscall_aggregate_consumer_test.go b/internal/syscall_aggregate_consumer_test.go
new file mode 100644
index 0000000..1f6e856
--- /dev/null
+++ b/internal/syscall_aggregate_consumer_test.go
@@ -0,0 +1,53 @@
+package internal
+
+import (
+	"bytes"
+	"encoding/binary"
+	"testing"
+
+	"ior/internal/flags"
+	"ior/internal/types"
+)
+
+func TestBuildSyscallSamplingRatesFamilyAndSyscallOverride(t *testing.T) {
+	cfg := flags.NewFlags()
+	cfg.SyscallFamilySamplingRates[types.FamilyTime] = 100
+	cfg.SyscallSamplingRates["clock_gettime"] = 3
+
+	rates := buildSyscallSamplingRates(cfg)
+	if got := rates[types.SYS_ENTER_NANOSLEEP]; got != 100 {
+		t.Fatalf("nanosleep rate = %d, want 100", got)
+	}
+	if got := rates[types.SYS_ENTER_CLOCK_GETTIME]; got != 3 {
+		t.Fatalf("clock_gettime rate = %d, want 3", got)
+	}
+}
+
+func TestDecodeRawSyscallAggregate(t *testing.T) {
+	want := rawSyscallAggregate{
+		Count:         7,
+		Errors:        2,
+		TotalDuration: 1234,
+		MinDuration:   12,
+		MaxDuration:   456,
+		Histogram:     [8]uint64{1, 2, 3, 4, 5, 6, 7, 8},
+	}
+	var buf bytes.Buffer
+	if err := binary.Write(&buf, binary.LittleEndian, want); err != nil {
+		t.Fatalf("binary write: %v", err)
+	}
+
+	got, err := decodeRawSyscallAggregate(buf.Bytes())
+	if err != nil {
+		t.Fatalf("decodeRawSyscallAggregate error: %v", err)
+	}
+	if got != want {
+		t.Fatalf("decoded aggregate = %+v, want %+v", got, want)
+	}
+}
+
+func TestDecodeRawSyscallAggregateRejectsBadSize(t *testing.T) {
+	if _, err := decodeRawSyscallAggregate([]byte{1, 2, 3}); err == nil {
+		t.Fatal("expected error for short value")
+	}
+}
-- 
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