diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0d08c58b..54d1a87f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -54,6 +54,13 @@ jobs:
           cd bld
           make install
 
+      - name: Test xeus-cpp C++
+        shell: bash -l {0}
+        run: |
+          cd bld/test
+          ./test_xeus_cpp
+        timeout-minutes: 4
+
       - name: test
         shell: bash -l {0}
         run: |
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 217d24b9..aea8d33e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -50,7 +50,8 @@ OPTION(XEUS_CPP_BUILD_EXECUTABLE "Build the xcpp executable" ON)
 OPTION(XEUS_CPP_USE_SHARED_XEUS "Link xcpp  with the xeus shared library (instead of the static library)" ON)
 OPTION(XEUS_CPP_USE_SHARED_XEUS_CPP "Link xcpp  with the xeus shared library (instead of the static library)" ON)
 
-
+# Test options
+OPTION(XEUS_CPP_BUILD_TESTS "xeus-cpp test suite" ON)
 
 if(EMSCRIPTEN)
     add_compile_definitions(XEUS_CPP_EMSCRIPTEN_WASM_BUILD)
@@ -305,6 +306,13 @@ if(EMSCRIPTEN)
     xeus_wasm_link_options(xcpp "web,worker")
 endif()
 
+# Tests
+# =====
+
+if(XEUS_CPP_BUILD_TESTS)
+    add_subdirectory(test)
+endif()
+
 # Installation
 # ============
 include(CMakePackageConfigHelpers)
diff --git a/environment-dev.yml b/environment-dev.yml
index 65476d59..0c2df603 100644
--- a/environment-dev.yml
+++ b/environment-dev.yml
@@ -20,3 +20,4 @@ dependencies:
   - jupyter_kernel_test>=0.4.3
   - nbval
   - pytest-rerunfailures
+  - doctest
\ No newline at end of file
diff --git a/src/xinspect.hpp b/src/xinspect.hpp
index 24eaf254..15b8d523 100644
--- a/src/xinspect.hpp
+++ b/src/xinspect.hpp
@@ -160,6 +160,7 @@ namespace xcpp
                     tagfile = it->at("tagfile");
                     std::string filename = tagfiles_dir + "/" + tagfile;
                     pugi::xml_document doc;
+                    doc.load_file(filename.c_str());
                     class_member_predicate predicate{typename_, "function", method[2]};
                     auto node = doc.find_node(predicate);
                     if (!node.empty())
@@ -193,6 +194,7 @@ namespace xcpp
                 tagfile = it->at("tagfile");
                 std::string filename = tagfiles_dir + "/" + tagfile;
                 pugi::xml_document doc;
+                doc.load_file(filename.c_str());
                 for (auto c : check)
                 {
                     node_predicate predicate{c, find_string};
@@ -262,5 +264,36 @@ namespace xcpp
             kernel_res["status"] = "ok";
         }
     }
+
+    class xintrospection : public xpreamble
+    {
+    public:
+
+        using xpreamble::pattern;
+        const std::string spattern = R"(^\?)";
+
+        xintrospection(clang::Interpreter& p)
+            : m_interpreter{p}
+        {
+            pattern = spattern;
+        }
+
+        void apply(const std::string& code, nl::json& kernel_res) override
+        {
+            std::regex re(spattern + R"((.*))");
+            std::smatch to_inspect;
+            std::regex_search(code, to_inspect, re);
+            inspect(to_inspect[1], kernel_res, m_interpreter);
+        }
+
+        virtual xpreamble* clone() const override
+        {
+            return new xintrospection(*this);
+        }
+
+    private:
+
+        clang::Interpreter& m_interpreter;
+    };
 }
 #endif
diff --git a/src/xinterpreter.cpp b/src/xinterpreter.cpp
index c8364e43..09fb27ce 100644
--- a/src/xinterpreter.cpp
+++ b/src/xinterpreter.cpp
@@ -327,16 +327,8 @@ namespace xcpp
         // Attempt normal evaluation
         
         try
-        {   std::string exp = R"(\w*(?:\:{2}|\<.*\>|\(.*\)|\[.*\])?)";
-            std::regex re(R"((\w*(?:\:{2}|\<.*\>|\(.*\)|\[.*\])?)(\.?)*$)");
-            auto inspect_request = is_inspect_request(code, re);
-            if (inspect_request.first)
-            {
-                inspect(inspect_request.second[0], kernel_res, *m_interpreter);
-            }
-            
+        {
             compilation_result = process_code(*m_interpreter, code, error_stream);
-        
         }
         catch (std::exception& e)
         {
@@ -589,6 +581,7 @@ namespace xcpp
 
     void interpreter::init_preamble()
     {
+        preamble_manager.register_preamble("introspection", new xintrospection(*m_interpreter));
         preamble_manager.register_preamble("magics", new xmagics_manager());
         preamble_manager.register_preamble("shell", new xsystem());
     }
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 00000000..f235f241
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,69 @@
+#############################################################################
+# Copyright (c) 2023, xeus-cpp contributors                                 #
+#                                                                           #
+# Distributed under the terms of the BSD 3-Clause License.                  #
+#                                                                           #
+# The full license is in the file LICENSE, distributed with this software.  #
+#############################################################################
+
+
+# Unit tests
+# ==========
+
+cmake_minimum_required(VERSION 3.1)
+
+if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+    project(xeus-cpp-test)
+
+    enable_testing()
+
+    find_package(xeus-cpp REQUIRED CONFIG)
+endif()
+
+include(CheckCXXCompilerFlag)
+
+string(TOUPPER "${CMAKE_BUILD_TYPE}" U_CMAKE_BUILD_TYPE)
+
+if(CMAKE_CXX_COMPILER_ID MATCHES Clang OR CMAKE_CXX_COMPILER_ID MATCHES GNU OR CMAKE_CXX_COMPILER_ID MATCHES Intel)
+    add_compile_options(-Wunused-parameter -Wextra -Wreorder -Wconversion -Wsign-conversion)
+
+    CHECK_CXX_COMPILER_FLAG(-march=native HAS_MARCH_NATIVE)
+    if (HAS_MARCH_NATIVE)
+        add_compile_options(-march=native)
+    endif()
+endif()
+
+if(CMAKE_CXX_COMPILER_ID MATCHES MSVC)
+    add_compile_options(/EHsc /MP /bigobj)
+    add_link_options(/MANIFEST:NO)
+endif()
+
+find_package(doctest)
+find_package(Threads)
+
+set(XEUS_CPP_TESTS
+    main.cpp
+    test_interpreter.cpp
+)
+
+add_executable(test_xeus_cpp ${XEUS_CPP_TESTS})
+
+if (APPLE)
+    set_target_properties(test_xeus_cpp PROPERTIES
+        MACOSX_RPATH ON
+    )
+else()
+    set_target_properties(test_xeus_cpp PROPERTIES
+        BUILD_WITH_INSTALL_RPATH 1
+        SKIP_BUILD_RPATH FALSE
+    )
+endif()
+
+set_target_properties(test_xeus_cpp PROPERTIES
+    INSTALL_RPATH_USE_LINK_PATH TRUE
+)
+
+target_link_libraries(test_xeus_cpp xeus-cpp doctest::doctest ${CMAKE_THREAD_LIBS_INIT})
+target_include_directories(test_xeus_cpp PRIVATE ${XEUS_CPP_INCLUDE_DIR})
+
+add_custom_target(xtest COMMAND test_xeus_cpp DEPENDS test_xeus_cpp)
diff --git a/test/main.cpp b/test/main.cpp
new file mode 100644
index 00000000..1309050a
--- /dev/null
+++ b/test/main.cpp
@@ -0,0 +1,10 @@
+/***************************************************************************
+ * Copyright (c) 2023, xeus-cpp contributors
+ *
+ * Distributed under the terms of the BSD 3-Clause License.
+ *
+ * The full license is in the file LICENSE, distributed with this software.
+ ****************************************************************************/
+
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest/doctest.h"
\ No newline at end of file
diff --git a/test/test_interpreter.cpp b/test/test_interpreter.cpp
new file mode 100644
index 00000000..a14903fa
--- /dev/null
+++ b/test/test_interpreter.cpp
@@ -0,0 +1,36 @@
+/***************************************************************************
+ * Copyright (c) 2023, xeus-cpp contributors
+ *
+ * Distributed under the terms of the BSD 3-Clause License.
+ *
+ * The full license is in the file LICENSE, distributed with this software.
+ ****************************************************************************/
+
+#include "doctest/doctest.h"
+#include "xeus-cpp/xinterpreter.hpp"
+
+TEST_SUITE("execute_request")
+{
+    TEST_CASE("fetch_documentation")
+    {
+
+        xcpp::interpreter interpreter(0, nullptr);
+
+        std::string code = "?std::vector";
+        std::string inspect_result = "https://en.cppreference.com/w/cpp/container/vector";
+        nl::json user_expressions = nl::json::object();
+
+        nl::json result = interpreter.execute_request(
+            code,
+            false,
+            false,
+            user_expressions,
+            false
+        );
+
+        REQUIRE(result["payload"][0]["data"]["text/plain"] == inspect_result);
+        REQUIRE(result["user_expressions"] == nl::json::object());
+        REQUIRE(result["found"] == true);
+        REQUIRE(result["status"] == "ok");
+    }
+}
\ No newline at end of file