diff --git a/tests/process.cpp b/tests/process.cpp
index f7865ba..77a86de 100644
--- a/tests/process.cpp
+++ b/tests/process.cpp
@@ -25,5 +25,57 @@ int main() {
     result = izo::LaunchProcess({"/bin/true", {}, directory / "missing", false});
     CHECK(!result);
     CHECK(!result.errorMessage.empty());
+
+    izo::ProcessOptions run_options;
+    run_options.executable = "/bin/sh";
+    run_options.arguments = {"-c", "printf stdout; printf stderr >&2; exit 7"};
+    run_options.captureOutput = true;
+    run_options.timeoutMs = 5000;
+    const auto run = izo::RunProcess(run_options);
+    CHECK(run.started);
+    CHECK(!run.timedOut);
+    CHECK(run.exitCode == 7);
+    CHECK(run.stdoutText == "stdout");
+    CHECK(run.stderrText == "stderr");
+
+    izo::ProcessOptions pipe_options;
+    pipe_options.executable = "/bin/cat";
+    pipe_options.captureOutput = true;
+    pipe_options.pipeStdin = true;
+    auto process = izo::StartProcess(pipe_options);
+    CHECK(process);
+    CHECK(process.Id() > 0);
+    CHECK(process.IsRunning());
+    CHECK(izo::IsProcessRunning(process.Id()));
+    CHECK(process.WriteStdin("input through pipe"));
+    CHECK(process.CloseStdin());
+    CHECK(process.Wait(5000));
+    CHECK(process.ExitCode() == 0);
+    CHECK(process.Stdout() == "input through pipe");
+    CHECK(process.Stderr().empty());
+    CHECK(!process.IsRunning());
+
+    izo::ProcessOptions timeout_options;
+    timeout_options.executable = "/bin/sh";
+    timeout_options.arguments = {"-c", "sleep 10"};
+    timeout_options.timeoutMs = 20;
+    const auto timeout = izo::RunProcess(timeout_options);
+    CHECK(timeout.started);
+    CHECK(timeout.timedOut);
+    CHECK(timeout.exitCode != 0);
+
+    izo::ProcessOptions output_options;
+    output_options.executable = "/bin/sh";
+    output_options.arguments = {"-c", "yes x | head -c 200000"};
+    output_options.captureOutput = true;
+    output_options.timeoutMs = 5000;
+    const auto output = izo::RunProcess(output_options);
+    CHECK(output);
+    CHECK(output.stdoutText.size() == 200000);
+
+    CHECK(izo::GetCurrentProcessId() > 0);
+    CHECK(izo::GetParentProcessId() > 0);
+    CHECK(izo::IsProcessRunning(izo::GetCurrentProcessId()));
+    CHECK(!izo::IsProcessRunning(0));
     std::filesystem::remove_all(directory);
 }