From 390e34ce7fc09daddd8180c4e687ab585e102c47 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 1 Oct 2026 18:50:26 +0200
Subject: kstd: ring_buffer: add more range-based tests

---
 libs/kstd/kstd/ring_buffer.tests.cpp | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/libs/kstd/kstd/ring_buffer.tests.cpp b/libs/kstd/kstd/ring_buffer.tests.cpp
index 7a9c56be..a118c2c3 100644
--- a/libs/kstd/kstd/ring_buffer.tests.cpp
+++ b/libs/kstd/kstd/ring_buffer.tests.cpp
@@ -383,6 +383,21 @@ SCENARIO("Ring Buffer iterators", "[kstd][ring_buffer]")
       REQUIRE(buffer.cbegin() == buffer.cend());
     }
 
+    THEN("the distance between begin() and end() is 0")
+    {
+      REQUIRE(std::ranges::distance(buffer.begin(), buffer.end()) == 0);
+    }
+
+    THEN("the distance between cbegin() and cend() is 0")
+    {
+      REQUIRE(std::ranges::distance(buffer.cbegin(), buffer.cend()) == 0);
+    }
+
+    THEN("the distance on the entire buffer is 0")
+    {
+      REQUIRE(std::ranges::distance(buffer) == 0);
+    }
+
     WHEN("working through a const reference")
     {
       auto const & ref = buffer;
@@ -396,6 +411,16 @@ SCENARIO("Ring Buffer iterators", "[kstd][ring_buffer]")
       {
         REQUIRE(buffer.begin() == buffer.end());
       }
+
+      THEN("the distance between begin() and end() is 0")
+      {
+        REQUIRE(std::ranges::distance(buffer.begin(), buffer.end()) == 0);
+      }
+
+      THEN("the distance on the entire buffer is 0")
+      {
+        REQUIRE(std::ranges::distance(buffer) == 0);
+      }
     }
   }
 
@@ -418,6 +443,21 @@ SCENARIO("Ring Buffer iterators", "[kstd][ring_buffer]")
       REQUIRE(buffer.begin() != buffer.cend());
     }
 
+    THEN("the distance between begin() and end() is 3")
+    {
+      REQUIRE(std::ranges::distance(buffer.begin(), buffer.end()) == 3);
+    }
+
+    THEN("the distance between cbegin() and cend() is 3")
+    {
+      REQUIRE(std::ranges::distance(buffer.cbegin(), buffer.cend()) == 3);
+    }
+
+    THEN("the distance on the entire buffer is 3")
+    {
+      REQUIRE(std::ranges::distance(buffer) == 3);
+    }
+
     THEN("begin() returns an iterator to the first element")
     {
       REQUIRE(*buffer.begin() == 'a');
@@ -519,6 +559,16 @@ SCENARIO("Ring Buffer iterators", "[kstd][ring_buffer]")
         REQUIRE(ref.begin() != ref.end());
       }
 
+      THEN("the distance between begin() and end() is 3")
+      {
+        REQUIRE(std::ranges::distance(buffer.begin(), buffer.end()) == 3);
+      }
+
+      THEN("the distance on the entire buffer is 3")
+      {
+        REQUIRE(std::ranges::distance(buffer) == 3);
+      }
+
       THEN("begin() returns an iterator to the first element")
       {
         REQUIRE(*ref.begin() == 'a');
-- 
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