diff --git a/.gitignore b/.gitignore
index d9c190a..2d5565d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,6 +20,7 @@ build/
 # Test results
 log.xml
 test_summary.jsonl
+runner/test/test_runner
 test/examples/test_assertions
 test/examples/test_chatbot
 test/examples/test_description
diff --git a/Makefile b/Makefile
index d4cb4cb..0697be6 100644
--- a/Makefile
+++ b/Makefile
@@ -19,14 +19,21 @@ ifeq ($(UNAME_S),Darwin)
 endif
 
 
+RUNNER_SRCS := runner/main.cpp runner/directory.cpp runner/process.cpp runner/output.cpp runner/runner.cpp
 TEST_SRCS := $(shell find test -name '*.cpp')
 TESTS := $(basename $(TEST_SRCS))
 
-
 test: all
 
 all: build $(TESTS) run
 
+runner: build
+	g++ $(RUNNER_SRCS) -std=c++17 -g -O0 -o build/cest-runner
+	g++ runner/test/runner.test.cpp runner/runner.cpp runner/test/helpers/helpers.cpp -Ibuild -std=c++17 -g -O0 -o runner/test/test_runner
+
+runner-tests: runner
+	cd runner && ../build/cest-runner
+
 build:
 	mkdir -p build
 	quom src/main.hpp build/cest
@@ -41,5 +48,6 @@ clean:
 	@rm -f log.xml
 	@rm -f *.jsonl
 	@rm -rf build
+	@rm -rf runner/test/test_runner
 
-.PHONY: clean run build test
+.PHONY: clean run build test runner runner-tests
diff --git a/runner/directory.cpp b/runner/directory.cpp
new file mode 100644
index 0000000..dad642a
--- /dev/null
+++ b/runner/directory.cpp
@@ -0,0 +1,62 @@
+#include "directory.h"
+#include <filesystem>
+#include <algorithm>
+
+constexpr bool hasPerms(std::filesystem::perms target, std::filesystem::perms other)
+{
+  return std::filesystem::perms::none != (other & target);
+}
+
+constexpr bool isExecutable(std::filesystem::perms target)
+{
+  return hasPerms(std::filesystem::perms::owner_exec, target) ||
+         hasPerms(std::filesystem::perms::group_exec, target) ||
+         hasPerms(std::filesystem::perms::others_exec, target);
+}
+
+static std::vector<std::string> filterBy(const std::string& filter, const std::vector<std::string>& entries)
+{
+  std::vector<std::string> result;
+
+  std::copy_if(
+    entries.begin(),
+    entries.end(),
+    std::back_inserter(result),
+    [&filter](std::string path) {
+      return path.find(filter) != std::string::npos;
+    }
+  );
+
+  return result;
+}
+
+std::vector<std::string> Directory::findExecutableFiles(
+  const std::string& path,
+  const std::string& filter
+) {
+  std::vector<std::string> result;
+
+  if (!std::filesystem::is_directory(path)) return result;
+
+  for (const auto& entry : std::filesystem::directory_iterator(path))
+  {
+    const auto permissions = entry.status().permissions();
+
+    if (entry.is_regular_file() && isExecutable(permissions))
+    {
+      result.push_back(entry.path());
+    }
+    else if (entry.is_directory())
+    {
+      const auto sub_files = Directory::findExecutableFiles(entry.path(), filter);
+      result.insert(result.end(), sub_files.begin(), sub_files.end());
+    }
+  }
+
+  return filterBy(filter, result);
+}
+
+std::string Directory::cwd()
+{
+  return std::filesystem::current_path();
+}
diff --git a/runner/directory.h b/runner/directory.h
new file mode 100644
index 0000000..d889b57
--- /dev/null
+++ b/runner/directory.h
@@ -0,0 +1,9 @@
+#pragma once
+#include <vector>
+#include <string>
+
+namespace Directory
+{
+  std::vector<std::string> findExecutableFiles(const std::string& path, const std::string& filter);
+  std::string cwd();
+}
diff --git a/runner/main.cpp b/runner/main.cpp
new file mode 100644
index 0000000..4117be0
--- /dev/null
+++ b/runner/main.cpp
@@ -0,0 +1,7 @@
+#include "runner.h"
+
+int main(int argc, char *argv[])
+{
+  Runner::runTestsInCurrentPath();
+  return 0;
+}
diff --git a/runner/output.cpp b/runner/output.cpp
new file mode 100644
index 0000000..7a78434
--- /dev/null
+++ b/runner/output.cpp
@@ -0,0 +1,8 @@
+#include "output.h"
+#include <iostream>
+
+void Output::print(std::stringstream& text)
+{
+  std::cout << text.str();
+  text.clear();
+}
diff --git a/runner/output.h b/runner/output.h
new file mode 100644
index 0000000..d5c0e00
--- /dev/null
+++ b/runner/output.h
@@ -0,0 +1,7 @@
+#pragma once
+#include <sstream>
+
+namespace Output
+{
+  void print(std::stringstream& text);
+}
diff --git a/runner/process.cpp b/runner/process.cpp
new file mode 100644
index 0000000..3d9352a
--- /dev/null
+++ b/runner/process.cpp
@@ -0,0 +1,69 @@
+#include "process.h"
+#include <unistd.h>
+#include <sys/wait.h>
+
+static constexpr int MAX_ARGS = 32;
+static constexpr int MAX_BUFFER = 4096;
+
+static constexpr bool isChildProcess(pid_t pid)
+{
+  return pid == 0;
+}
+
+static void handleChildProcess(int pipe_fd[2], const std::string& path, std::vector<std::string> args)
+{
+  std::array<char *, MAX_ARGS> c_args;
+
+  dup2(pipe_fd[1], STDOUT_FILENO);
+  close(STDERR_FILENO);
+  close(pipe_fd[0]);
+  close(pipe_fd[1]);
+
+  c_args.fill(NULL);
+
+  for (int i=0; i<args.size(); ++i)
+  {
+    c_args[i] = (char *)args[i].c_str();
+  }
+
+  execv(path.c_str(), c_args.data());
+}
+
+static void waitForChildren()
+{
+  pid_t pid;
+  int status = 0;
+
+  while ((pid = wait(&status)) > 0);
+}
+
+static void handleParentProcess(int pipe_fd[2], std::function<void(std::string)> on_output)
+{
+  std::array<char, MAX_BUFFER> buffer;
+
+  buffer.fill('\0');
+  close(pipe_fd[1]);
+  read(pipe_fd[0], buffer.data(), buffer.size());
+
+  on_output(std::string(buffer.data()));
+
+  waitForChildren();
+}
+
+void Process::runExecutable(const std::string& path, std::function<void(std::string)> on_output)
+{
+  int pipe_fd[2];
+  pipe(pipe_fd);
+
+  const auto pid = fork();
+
+  if (isChildProcess(pid))
+  {
+    std::vector<std::string> args = { "-o" };
+    handleChildProcess(pipe_fd, path, args);
+  }
+  else
+  {
+    handleParentProcess(pipe_fd, on_output);
+  }
+}
diff --git a/runner/process.h b/runner/process.h
new file mode 100644
index 0000000..5409f3c
--- /dev/null
+++ b/runner/process.h
@@ -0,0 +1,7 @@
+#include <functional>
+#include <string>
+
+namespace Process
+{
+  void runExecutable(const std::string& path, std::function<void(std::string)> on_output);
+}
diff --git a/runner/runner.cpp b/runner/runner.cpp
new file mode 100644
index 0000000..683be7a
--- /dev/null
+++ b/runner/runner.cpp
@@ -0,0 +1,21 @@
+#include "runner.h"
+#include "process.h"
+#include "directory.h"
+#include "output.h"
+
+void Runner::runTestsInCurrentPath()
+{
+  std::stringstream out;
+  const auto executables = Directory::findExecutableFiles(Directory::cwd(), "test_");
+
+  for (const auto& test_file : executables)
+  {
+    out << "Running test " << test_file << std::endl;
+    Output::print(out);
+
+    Process::runExecutable(test_file, [&out](const auto& output) {
+      out << output;
+      Output::print(out);
+    });
+  }
+}
diff --git a/runner/runner.h b/runner/runner.h
new file mode 100644
index 0000000..cb21b9c
--- /dev/null
+++ b/runner/runner.h
@@ -0,0 +1,6 @@
+#pragma once
+
+namespace Runner
+{
+  void runTestsInCurrentPath();
+}
diff --git a/runner/test/helpers/helpers.cpp b/runner/test/helpers/helpers.cpp
new file mode 100644
index 0000000..739dcca
--- /dev/null
+++ b/runner/test/helpers/helpers.cpp
@@ -0,0 +1,56 @@
+#include <sstream>
+#include <vector>
+#include <functional>
+#include "helpers.h"
+#include "../../output.h"
+#include "../../process.h"
+#include "../../directory.h"
+
+static std::vector<std::string> __mock_executable_files;
+static bool __find_executable_files_called = false;
+static std::string __find_executable_files_path;
+static std::string __find_executable_files_filter;
+
+static std::string __mock_run_executable_output;
+static bool __run_executable_has_been_called = false;
+static std::vector<std::string> __run_executable_path;
+
+void Output::print(std::stringstream& text)
+{
+}
+
+void Directory::findExecutableFiles_mockFiles(std::vector<std::string> files)
+{
+  __mock_executable_files = files;
+}
+bool Directory::findExecutableFiles_hasBeenCalledWith(const std::string& path, const std::string& filter)
+{
+  return __find_executable_files_called && __find_executable_files_path == path && __find_executable_files_filter == filter;
+}
+std::vector<std::string> Directory::findExecutableFiles(const std::string& path, const std::string& filter)
+{
+  __find_executable_files_path = path;
+  __find_executable_files_filter = filter;
+  __find_executable_files_called = true;
+  return __mock_executable_files;
+}
+std::string Directory::cwd()
+{
+  return "/cwd";
+}
+
+void Process::runExecutable_mockOutput(const std::string& output)
+{
+  __mock_run_executable_output = output;
+}
+void Process::runExecutable(const std::string& path, std::function<void(std::string)> on_output)
+{
+  __run_executable_has_been_called = true;
+  __run_executable_path.push_back(path);
+  on_output(__mock_run_executable_output);
+}
+bool Process::runExecutable_hasBeenCalledWith(const std::string& path)
+{
+  auto it = std::find(__run_executable_path.cbegin(), __run_executable_path.cend(), path);
+  return __run_executable_has_been_called && it != __run_executable_path.end();
+}
diff --git a/runner/test/helpers/helpers.h b/runner/test/helpers/helpers.h
new file mode 100644
index 0000000..714bd63
--- /dev/null
+++ b/runner/test/helpers/helpers.h
@@ -0,0 +1,16 @@
+#pragma once
+#include <sstream>
+#include <functional>
+#include <vector>
+
+namespace Directory
+{
+  void findExecutableFiles_mockFiles(std::vector<std::string> files);
+  bool findExecutableFiles_hasBeenCalledWith(const std::string& path, const std::string& filter);
+}
+
+namespace Process
+{
+  void runExecutable_mockOutput(const std::string& output);
+  bool runExecutable_hasBeenCalledWith(const std::string& path);
+}
diff --git a/runner/test/runner.test.cpp b/runner/test/runner.test.cpp
new file mode 100644
index 0000000..7dd506c
--- /dev/null
+++ b/runner/test/runner.test.cpp
@@ -0,0 +1,17 @@
+#include <cest>
+#include "../runner.h"
+#include "../directory.h"
+#include "helpers/helpers.h"
+
+describe("Runner", []() {
+  it("executes all tests found in the current directory", []() {
+    std::vector<std::string> test_files = { "first/test", "second/test" };
+    Directory::findExecutableFiles_mockFiles(test_files);
+
+    Runner::runTestsInCurrentPath();
+
+    expect(Directory::findExecutableFiles_hasBeenCalledWith(Directory::cwd(), "test_")).toBeTruthy();
+    expect(Process::runExecutable_hasBeenCalledWith("first/test")).toBeTruthy();
+    expect(Process::runExecutable_hasBeenCalledWith("second/test")).toBeTruthy();
+  });
+});
diff --git a/src/arg-parser.hpp b/src/arg-parser.hpp
index 1503990..2e1346f 100644
--- a/src/arg-parser.hpp
+++ b/src/arg-parser.hpp
@@ -50,7 +50,7 @@ namespace cest
             }
             catch (const std::invalid_argument &err)
             {
-              std::cout << "Invalid seed value: " << argv[i + 1] << std::endl;
+              std::cerr << "Invalid seed value: " << argv[i + 1] << std::endl;
             }
           }
         }
@@ -59,4 +59,4 @@ namespace cest
 
     return options;
   }
-}
\ No newline at end of file
+}