1 files changed, 79 insertions, 0 deletions
diff --git a/nihil.posix/execvp.test.cc b/nihil.posix/execvp.test.cc
new file mode 100644
index 0000000..e34823d
--- /dev/null
+++ b/nihil.posix/execvp.test.cc
@@ -0,0 +1,79 @@
+// This source code is released into the public domain.
+
+#include <catch2/catch_test_macros.hpp>
+
+import nihil.posix;
+
+namespace {
+
+SCENARIO("nihil::execvp() can be used to spawn a shell")
+{
+	GIVEN("An execvp object")
+	{
+		auto exec = nihil::execvp("sh", nihil::argv{"sh", "-c", "x=1; echo $x"});
+
+		THEN("sh was found in $PATH")
+		{
+			if (!exec)
+				FAIL(exec.error());
+		}
+
+		WHEN("The shell is executed")
+		{
+			auto output = std::string();
+			auto capture = nihil::make_capture(nihil::stdout_fileno, output).value();
+			auto status = nihil::spawn(exec.value(), capture).value().wait().value();
+
+			THEN("The exit code is 0")
+			{
+				REQUIRE(status.status() == 0);
+			}
+			AND_THEN("The expected output was captured")
+			{
+				REQUIRE(output == "1\n");
+			}
+		}
+	}
+}
+
+SCENARIO("nihil::execvp() returns the shell's exit code")
+{
+	GIVEN("An execvp object")
+	{
+		auto exec = nihil::execvp("sh", nihil::argv{"sh", "-c", "x=42; exit $x"});
+
+		THEN("sh was found in $PATH")
+		{
+			if (!exec)
+				FAIL(exec.error());
+		}
+
+		WHEN("The shell is executed")
+		{
+			auto output = std::string();
+			auto capture = nihil::make_capture(nihil::stdout_fileno, output).value();
+			auto status = nihil::spawn(exec.value(), capture).value().wait().value();
+
+			THEN("The exit code is 1")
+			{
+				REQUIRE(status.status() == 42);
+			}
+		}
+	}
+}
+
+SCENARIO("nihil::execvp() returns an error if the executable is not in $PATH")
+{
+	GIVEN("An execvp object for a non-existent executable")
+	{
+		auto exec = nihil::execvp("nihil_no_such_executable", nihil::argv{"x"});
+
+		THEN("A no_such_file_or_directory error is returned")
+		{
+			REQUIRE(!exec);
+			REQUIRE(exec.error().root_cause() == std::errc::no_such_file_or_directory);
+		}
+	}
+}
+
+} // anonymous namespace