1 files changed, 71 insertions, 0 deletions
diff --git a/test/include/mbgl/test/fixture_log_observer.hpp b/test/include/mbgl/test/fixture_log_observer.hpp
new file mode 100644
index 0000000000..f2ccb5cb58
--- /dev/null
+++ b/test/include/mbgl/test/fixture_log_observer.hpp
@@ -0,0 +1,71 @@
+#ifndef MBGL_TEST_FIXTURE_LOG_OBSERVER
+#define MBGL_TEST_FIXTURE_LOG_OBSERVER
+
+#include <mbgl/platform/log.hpp>
+
+#include <vector>
+#include <cstdarg>
+#include <mutex>
+#include <iostream>
+
+namespace mbgl {
+
+class FixtureLog {
+public:
+    struct Message {
+        Message(EventSeverity severity_, Event event_, int64_t code_, const std::string &msg_);
+        Message();
+
+        bool operator==(const Message& rhs) const;
+
+        const EventSeverity severity;
+        const Event event;
+        const int64_t code;
+        const std::string msg;
+
+        mutable bool checked = false;
+    };
+
+    class Observer : public Log::Observer {
+    public:
+        using LogMessage = Message;
+
+        Observer(FixtureLog* log = nullptr);
+        ~Observer();
+
+        // Log::Observer implementation
+        virtual bool onRecord(EventSeverity severity,
+                              Event event,
+                              int64_t code,
+                              const std::string& msg) override;
+
+        bool empty() const;
+        size_t count(const Message& message) const;
+        std::vector<Message> unchecked() const;
+
+    private:
+        FixtureLog* log;
+        std::vector<Message> messages;
+        mutable std::mutex messagesMutex;
+    };
+
+    FixtureLog();
+
+    bool empty() const;
+    size_t count(const Message& message) const;
+
+    ~FixtureLog();
+
+private:
+    Observer* observer;
+};
+
+::std::ostream &operator<<(::std::ostream &os,
+                           const std::vector<FixtureLog::Observer::LogMessage> &messages);
+::std::ostream &operator<<(::std::ostream &os, const FixtureLog::Observer::LogMessage &message);
+
+using FixtureLogObserver = FixtureLog::Observer;
+
+} // namespace mbgl
+
+#endif