kstd: ring_buffer: add more pop_front() tests

1 files changed, 43 insertions, 0 deletions

diff --git a/libs/kstd/kstd/ring_buffer.tests.cpp b/libs/kstd/kstd/ring_buffer.tests.cpp
index 479283ed..767e7422 100644
--- a/libs/kstd/kstd/ring_buffer.tests.cpp
+++ b/libs/kstd/kstd/ring_buffer.tests.cpp
@@ -1341,4 +1341,47 @@ SCENARIO("Ring Buffer modifiers", "[kstd][ring_buffer]")
       REQUIRE_FALSE(buffer.try_push_back(kstd::tests::static_copy_move_tracker{}));
     }
   }
+
+  GIVEN("A ring buffer with a capacity of 3 that has wrapped around")
+  {
+    auto buffer = kstd::ring_buffer<int, 3>{};
+    buffer.push_back(1);
+    buffer.push_back(2);
+    buffer.push_back(3);
+    buffer.push_back(4);
+
+    WHEN("popping an element")
+    {
+      buffer.pop_front();
+
+      THEN("the size is 2")
+      {
+        REQUIRE(buffer.size() == 2);
+      }
+
+      THEN("the remaining elements are the two newest, in order")
+      {
+        REQUIRE(buffer.at(0) == 3);
+        REQUIRE(buffer.at(1) == 4);
+      }
+    }
+
+    WHEN("popping an element and then pushing a new one")
+    {
+      buffer.pop_front();
+      buffer.push_back(5);
+
+      THEN("the size is back to 3")
+      {
+        REQUIRE(buffer.size() == 3);
+      }
+
+      THEN("the content reflects the pop and the push")
+      {
+        REQUIRE(buffer.at(0) == 3);
+        REQUIRE(buffer.at(1) == 4);
+        REQUIRE(buffer.at(2) == 5);
+      }
+    }
+  }
 }
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