end2end: Add blend state tests

src/tests/CMakeLists.txt

@@ -69,6 +69,7 @@ NXTInternalTarget("tests" nxt_unittests)
 add_executable(nxt_end2end_tests
     ${END2END_TESTS_DIR}/BasicTests.cpp
     ${END2END_TESTS_DIR}/BufferTests.cpp
+    ${END2END_TESTS_DIR}/BlendStateTests.cpp
     ${END2END_TESTS_DIR}/CopyTests.cpp
     ${END2END_TESTS_DIR}/DepthStencilStateTests.cpp
     ${END2END_TESTS_DIR}/InputStateTests.cpp

src/tests/NXTTest.cpp

@@ -97,6 +97,7 @@ NXTTest::~NXTTest() {
     readbackSlots.clear();
     queue = nxt::Queue();
     device = nxt::Device();
+    swapchain = nxt::SwapChain();
 
     delete binding;
     binding = nullptr;