[tests] Reorganize tests to match src structure

test/util/work_queue.cpp

@@ -0,0 +1,63 @@
+#include "../fixtures/util.hpp"
+
+#include <mbgl/util/run_loop.hpp>
+#include <mbgl/util/thread.hpp>
+#include <mbgl/util/work_queue.hpp>
+
+#include <thread>
+
+using namespace mbgl::util;
+
+class TestThread {
+public:
+    TestThread(WorkQueue* queue_) : queue(queue_) {}
+
+    void send(std::function<void()>&& fn) {
+        EXPECT_TRUE(ThreadContext::currentlyOn(ThreadType::Map));
+
+        queue->push(std::move(fn));
+    }
+
+private:
+    WorkQueue* queue;
+};
+
+TEST(WorkQueue, push) {
+    RunLoop loop;
+
+    WorkQueue queue;
+    Thread<TestThread> thread({"Test", ThreadType::Map, ThreadPriority::Regular}, &queue);
+
+    uint8_t count = 0;
+
+    auto endTest = [&]() {
+        EXPECT_TRUE(ThreadContext::currentlyOn(ThreadType::Main));
+
+        if (++count == 4) {
+            loop.stop();
+        }
+    };
+
+    thread.invoke(&TestThread::send, endTest);
+    thread.invoke(&TestThread::send, endTest);
+    thread.invoke(&TestThread::send, endTest);
+    thread.invoke(&TestThread::send, endTest);
+
+    loop.run();
+}
+
+TEST(WorkQueue, cancel) {
+    RunLoop loop;
+
+    WorkQueue queue;
+
+    auto work = [&]() {
+        FAIL() << "Should never be called";
+    };
+
+    queue.push(work);
+    queue.push(work);
+    queue.push(work);
+    queue.push(work);
+    queue.push(work);
+}