Add tests for sf::Clipboard

test/CMakeLists.txt

@@ -59,6 +59,7 @@ target_compile_definitions(test-sfml-system PRIVATE
 )
 
 set(WINDOW_SRC
+    Window/Clipboard.test.cpp
     Window/Context.test.cpp
     Window/ContextSettings.test.cpp
     Window/Cursor.test.cpp

test/Window/Clipboard.test.cpp

@@ -0,0 +1,28 @@
+#include <SFML/Window/Clipboard.hpp>
+
+// Other 1st party headers
+#include <SFML/System/String.hpp>
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <WindowUtil.hpp>
+
+TEST_CASE("[Window] sf::Clipboard", runDisplayTests())
+{
+    // Capture current clipboard state
+    const auto currentClipboard = sf::Clipboard::getString();
+
+    SECTION("Set/get string")
+    {
+        sf::Clipboard::setString("Welcome to SFML!");
+        CHECK(sf::Clipboard::getString() == "Welcome to SFML!");
+    }
+
+    // Restore clipboard
+    sf::Clipboard::setString(currentClipboard);
+
+    // We rely on getString triggering clipboard event processing on X11 to make
+    // setString work, but note that the way setString is guaranteed to work is
+    // by having an open window for which events are being handled.
+    CHECK(sf::Clipboard::getString() == currentClipboard);
+}