2 files changed, 128 insertions, 0 deletions
diff --git a/test/buildtool/system/TARGETS b/test/buildtool/system/TARGETS
new file mode 100644
index 00000000..97101bae
--- /dev/null
+++ b/test/buildtool/system/TARGETS
@@ -0,0 +1,13 @@
+{ "system_command":
+  { "type": ["@", "rules", "CC/test", "test"]
+  , "name": ["system_command"]
+  , "srcs": ["system_command.test.cpp"]
+  , "deps":
+    [ ["@", "catch2", "", "catch2"]
+    , ["test", "catch-main"]
+    , ["src/buildtool/system", "system_command"]
+    ]
+  , "stage": ["test", "buildtool", "system"]
+  }
+, "TESTS": {"type": "install", "tainted": ["test"], "deps": ["system_command"]}
+}
diff --git a/test/buildtool/system/system_command.test.cpp b/test/buildtool/system/system_command.test.cpp
new file mode 100644
index 00000000..6b3777ee
--- /dev/null
+++ b/test/buildtool/system/system_command.test.cpp
@@ -0,0 +1,115 @@
+#include <cstdlib>
+#include <iostream>
+
+#include "catch2/catch.hpp"
+#include "src/buildtool/system/system_command.hpp"
+
+namespace {
+[[nodiscard]] auto GetTestDir() -> std::filesystem::path {
+    auto* tmp_dir = std::getenv("TEST_TMPDIR");
+    if (tmp_dir != nullptr) {
+        return tmp_dir;
+    }
+    return FileSystemManager::GetCurrentDirectory() /
+           "test/buildtool/file_system";
+}
+}  // namespace
+
+TEST_CASE("SystemCommand", "[filesystem]") {
+    using Catch::Matchers::Contains;
+    using Catch::Matchers::StartsWith;
+
+    std::string name{"ExecutorTest"};
+    SystemCommand system{name};
+
+    auto const testdir = GetTestDir();
+
+    SECTION("empty command") {
+        auto tmpdir = testdir / "empty";
+        REQUIRE(FileSystemManager::CreateDirectoryExclusive(tmpdir));
+        auto output = system.Execute(
+            {}, {}, FileSystemManager::GetCurrentDirectory(), tmpdir);
+        CHECK(not output.has_value());
+    }
+
+    SECTION("simple command, no arguments, no env variables") {
+        auto tmpdir = testdir / "simple_noargs";
+        REQUIRE(FileSystemManager::CreateDirectoryExclusive(tmpdir));
+        auto output = system.Execute(
+            {"echo"}, {}, FileSystemManager::GetCurrentDirectory(), tmpdir);
+        REQUIRE(output.has_value());
+        CHECK(output->return_value == 0);
+        CHECK(*FileSystemManager::ReadFile(output->stdout_file) == "\n");
+        CHECK(FileSystemManager::ReadFile(output->stderr_file)->empty());
+    }
+
+    SECTION(
+        "simple command, env variables are expanded only when wrapped with "
+        "/bin/sh") {
+        auto tmpdir = testdir / "simple_env0";
+        REQUIRE(FileSystemManager::CreateDirectoryExclusive(tmpdir));
+        auto output = system.Execute({"echo", "${MY_MESSAGE}"},
+                                     {{"MY_MESSAGE", "hello"}},
+                                     FileSystemManager::GetCurrentDirectory(),
+                                     tmpdir);
+        REQUIRE(output.has_value());
+        CHECK(output->return_value == 0);
+        CHECK(*FileSystemManager::ReadFile(output->stdout_file) ==
+              "${MY_MESSAGE}\n");
+        CHECK(FileSystemManager::ReadFile(output->stderr_file)->empty());
+
+        tmpdir = testdir / "simple_env1";
+        REQUIRE(FileSystemManager::CreateDirectoryExclusive(tmpdir));
+        auto output_wrapped =
+            system.Execute({"/bin/sh", "-c", "set -e\necho ${MY_MESSAGE}"},
+                           {{"MY_MESSAGE", "hello"}},
+                           FileSystemManager::GetCurrentDirectory(),
+                           tmpdir);
+        REQUIRE(output_wrapped.has_value());
+        CHECK(output_wrapped->return_value == 0);
+        CHECK(*FileSystemManager::ReadFile(output_wrapped->stdout_file) ==
+              "hello\n");
+        CHECK(
+            FileSystemManager::ReadFile(output_wrapped->stderr_file)->empty());
+    }
+
+    SECTION("executable, producing std output, std error and return value") {
+        auto tmpdir = testdir / "exe_output";
+        REQUIRE(FileSystemManager::CreateDirectoryExclusive(tmpdir));
+        auto output = system.Execute(
+            {"/bin/sh",
+             "-c",
+             "set -e\necho this is stdout; echo this is stderr >&2; exit 5"},
+            {},
+            FileSystemManager::GetCurrentDirectory(),
+            tmpdir);
+        REQUIRE(output.has_value());
+        CHECK(output->return_value == 5);
+        CHECK(*FileSystemManager::ReadFile(output->stdout_file) ==
+              "this is stdout\n");
+        CHECK(*FileSystemManager::ReadFile(output->stderr_file) ==
+              "this is stderr\n");
+    }
+
+    SECTION(
+        "executable dependent on env, producing std output, std error and "
+        "return value") {
+        auto tmpdir = testdir / "exe_output_from_env";
+        REQUIRE(FileSystemManager::CreateDirectoryExclusive(tmpdir));
+        std::string const stdout = "this is stdout from env var";
+        std::string const stderr = "this is stderr from env var";
+        auto output = system.Execute(
+            {"/bin/sh",
+             "-c",
+             "set -e\necho ${MY_STDOUT}; echo ${MY_STDERR} >&2; exit 5"},
+            {{"MY_STDOUT", stdout}, {"MY_STDERR", stderr}},
+            FileSystemManager::GetCurrentDirectory(),
+            tmpdir);
+        REQUIRE(output.has_value());
+        CHECK(output->return_value == 5);
+        CHECK(*FileSystemManager::ReadFile(output->stdout_file) ==
+              stdout + '\n');
+        CHECK(*FileSystemManager::ReadFile(output->stderr_file) ==
+              stderr + '\n');
+    }
+}