From 931075da591a10515a38bdeaea809e493f872b9d Mon Sep 17 00:00:00 2001
From: Peter Lawrey <peter.lawrey@chronicle.software>
Date: Fri, 23 May 2025 09:08:46 +0100
Subject: [PATCH] test: verify hyper-thread pairs from cpuinfo

---
 .../impl/VanillaCpuLayoutPairTest.java        | 56 +++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 affinity/src/test/java/net/openhft/affinity/impl/VanillaCpuLayoutPairTest.java

diff --git a/affinity/src/test/java/net/openhft/affinity/impl/VanillaCpuLayoutPairTest.java b/affinity/src/test/java/net/openhft/affinity/impl/VanillaCpuLayoutPairTest.java
new file mode 100644
index 000000000..99986acd3
--- /dev/null
+++ b/affinity/src/test/java/net/openhft/affinity/impl/VanillaCpuLayoutPairTest.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2016-2025 chronicle.software
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package net.openhft.affinity.impl;
+
+import org.junit.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests for {@link VanillaCpuLayout#pair(int)} using sample cpuinfo files.
+ */
+public class VanillaCpuLayoutPairTest {
+
+    @Test
+    public void testPairForI7() throws IOException {
+        try (InputStream is = getClass().getClassLoader().getResourceAsStream("i7.cpuinfo")) {
+            VanillaCpuLayout layout = VanillaCpuLayout.fromCpuInfo(is);
+            assertEquals(4, layout.pair(0));
+            assertEquals(5, layout.pair(1));
+            assertEquals(6, layout.pair(2));
+            assertEquals(7, layout.pair(3));
+            assertEquals(0, layout.pair(4));
+            assertEquals(1, layout.pair(5));
+            assertEquals(2, layout.pair(6));
+            assertEquals(3, layout.pair(7));
+        }
+    }
+
+    @Test
+    public void testPairForI3() throws IOException {
+        try (InputStream is = getClass().getClassLoader().getResourceAsStream("i3.cpuinfo")) {
+            VanillaCpuLayout layout = VanillaCpuLayout.fromCpuInfo(is);
+            assertEquals(2, layout.pair(0));
+            assertEquals(3, layout.pair(1));
+            assertEquals(0, layout.pair(2));
+            assertEquals(1, layout.pair(3));
+        }
+    }
+}