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-rw-r--r--tests/io_tester.hpp47
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diff --git a/tests/io_tester.hpp b/tests/io_tester.hpp
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+#ifndef BIBOUMI_IO_TESTER_HPP
+#define BIBOUMI_IO_TESTER_HPP
+
+#include <ostream>
+#include <sstream>
+
+/**
+ * Redirects a stream into a streambuf until the object is destroyed.
+ */
+template <typename StreamType>
+class IoTester
+{
+public:
+ IoTester(StreamType& ios):
+ stream{},
+ ios(ios),
+ old_buf(ios.rdbuf())
+ {
+ // Redirect the given os into our stringstream’s buf
+ this->ios.rdbuf(this->stream.rdbuf());
+ }
+ ~IoTester()
+ {
+ this->ios.rdbuf(this->old_buf);
+ }
+ IoTester& operator=(const IoTester&) = delete;
+ IoTester& operator=(IoTester&&) = delete;
+ IoTester(const IoTester&) = delete;
+ IoTester(IoTester&&) = delete;
+
+ std::string str() const
+ {
+ return this->stream.str();
+ }
+
+ void set_string(const std::string& s)
+ {
+ this->stream.str(s);
+ }
+
+private:
+ std::stringstream stream;
+ StreamType& ios;
+ std::streambuf* const old_buf;
+};
+
+#endif //BIBOUMI_IO_TESTER_HPP