1 files changed, 83 insertions, 0 deletions
diff --git a/libs/kstd/kstd/string.test.cpp b/libs/kstd/kstd/string.test.cpp
index e5925aa..19345e0 100644
--- a/libs/kstd/kstd/string.test.cpp
+++ b/libs/kstd/kstd/string.test.cpp
@@ -1954,6 +1954,89 @@ SCENARIO("String modifiers", "[string]")
     }
   }
 
+  GIVEN("A long string")
+  {
+    auto s = kstd::string{"abcdefghijABCDEFGHIJ"};
+    auto old_capacity = s.capacity();
+    auto old_size = s.size();
+    auto old_data = s.data();
+
+    WHEN("reserving a smaller capacity")
+    {
+      s.reserve(1);
+
+      THEN("the capacity does not change")
+      {
+        REQUIRE(s.capacity() == old_capacity);
+      }
+
+      THEN("the content stays the same")
+      {
+        REQUIRE(s == "abcdefghijABCDEFGHIJ");
+      }
+
+      THEN("the size stays the same")
+      {
+        REQUIRE(s.size() == old_size);
+      }
+
+      THEN("the data pointer stays the same")
+      {
+        REQUIRE(s.data() == old_data);
+      }
+    }
+
+    WHEN("reserving equal capacity")
+    {
+      s.reserve(old_capacity);
+
+      THEN("the capacity does not change")
+      {
+        REQUIRE(s.capacity() == old_capacity);
+      }
+
+      THEN("the content stays the same")
+      {
+        REQUIRE(s == "abcdefghijABCDEFGHIJ");
+      }
+
+      THEN("the size stays the same")
+      {
+        REQUIRE(s.size() == old_size);
+      }
+
+      THEN("the data pointer stays the same")
+      {
+        REQUIRE(static_cast<void const *>(s.data()) == static_cast<void const *>(old_data));
+      }
+    }
+
+    WHEN("reserving larger capacity")
+    {
+      s.reserve(old_capacity + 1);
+
+      THEN("the capacity increases")
+      {
+        REQUIRE(s.capacity() >= old_capacity + 1);
+      }
+
+      THEN("the content stays the same")
+      {
+        REQUIRE(s == "abcdefghijABCDEFGHIJ");
+      }
+
+      THEN("the size stays the same")
+      {
+        REQUIRE(s.size() == old_size);
+      }
+
+      THEN("the data pointer changes")
+      {
+        REQUIRE(s.data() != old_data);
+      }
+    }
+  }
+
   GIVEN("Two strings")
   {
     auto str1 = kstd::string{"Blub"};