test: Remove system_tests/run_command runtime dependencies

src/test/mock_process.cpp

@@ -0,0 +1,40 @@
+// Copyright (c) 2025-present The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or https://opensource.org/license/mit/.
+
+#include <boost/test/unit_test.hpp>
+
+#include <iostream>
+#include <string>
+
+BOOST_AUTO_TEST_SUITE(mock_process, *boost::unit_test::disabled())
+
+BOOST_AUTO_TEST_CASE(valid_json, *boost::unit_test::disabled())
+{
+    std::cout << R"({"success": true})" << std::endl;
+}
+
+BOOST_AUTO_TEST_CASE(nonzeroexit_nooutput, *boost::unit_test::disabled())
+{
+    BOOST_FAIL("Test unconditionally fails.");
+}
+
+BOOST_AUTO_TEST_CASE(nonzeroexit_stderroutput, *boost::unit_test::disabled())
+{
+    std::cerr << "err\n";
+    BOOST_FAIL("Test unconditionally fails.");
+}
+
+BOOST_AUTO_TEST_CASE(invalid_json, *boost::unit_test::disabled())
+{
+    std::cout << "{\n";
+}
+
+BOOST_AUTO_TEST_CASE(pass_stdin_to_stdout, *boost::unit_test::disabled())
+{
+    std::string s;
+    std::getline(std::cin, s);
+    std::cout << s << std::endl;
+}
+
+BOOST_AUTO_TEST_SUITE_END()