From 4bdb0505635e66e07aa7edd9d1f842f860aa581c Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Mon, 23 Feb 2026 13:23:23 +0200
Subject: tests: cover durationToPrev gap semantics

---
 internal/event/pair_test.go | 56 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 internal/event/pair_test.go

(limited to 'internal')

diff --git a/internal/event/pair_test.go b/internal/event/pair_test.go
new file mode 100644
index 0000000..a1cb8ab
--- /dev/null
+++ b/internal/event/pair_test.go
@@ -0,0 +1,56 @@
+package event
+
+import (
+	"ior/internal/types"
+	"testing"
+)
+
+func TestPairCalculateDurationsFirstEvent(t *testing.T) {
+	enter := &types.OpenEvent{
+		Time: 1000,
+		Pid:  1,
+		Tid:  2,
+	}
+	exit := &types.RetEvent{
+		Time: 1100,
+		Pid:  1,
+		Tid:  2,
+		Ret:  0,
+	}
+
+	pair := NewPair(enter)
+	pair.ExitEv = exit
+	pair.CalculateDurations(0)
+
+	if pair.Duration != 100 {
+		t.Fatalf("Duration = %d, want 100", pair.Duration)
+	}
+	if pair.DurationToPrev != 0 {
+		t.Fatalf("DurationToPrev = %d, want 0 for first event", pair.DurationToPrev)
+	}
+}
+
+func TestPairCalculateDurationsWithPreviousExit(t *testing.T) {
+	enter := &types.OpenEvent{
+		Time: 2000,
+		Pid:  1,
+		Tid:  2,
+	}
+	exit := &types.RetEvent{
+		Time: 2100,
+		Pid:  1,
+		Tid:  2,
+		Ret:  0,
+	}
+
+	pair := NewPair(enter)
+	pair.ExitEv = exit
+	pair.CalculateDurations(1500)
+
+	if pair.Duration != 100 {
+		t.Fatalf("Duration = %d, want 100", pair.Duration)
+	}
+	if pair.DurationToPrev != 500 {
+		t.Fatalf("DurationToPrev = %d, want 500", pair.DurationToPrev)
+	}
+}
-- 
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