posix: add tempfile()

1 files changed, 49 insertions, 0 deletions

diff --git a/nihil.posix/test.getenv.cc b/nihil.posix/test.getenv.cc
new file mode 100644
index 0000000..fdb5277
--- /dev/null
+++ b/nihil.posix/test.getenv.cc
@@ -0,0 +1,49 @@
+/*
+ * This source code is released into the public domain.
+ */
+
+#include <ranges>
+#include <string>
+#include <system_error>
+
+#include <unistd.h>
+
+#include <catch2/catch_test_macros.hpp>
+
+import nihil.posix;
+
+TEST_CASE("getenv: existing value", "[getenv]")
+{
+	auto constexpr *name = "NIHIL_TEST_VAR";
+	auto constexpr *value = "test is a test";
+
+	REQUIRE(::setenv(name, value, 1) == 0);
+
+	auto const s = nihil::getenv(name);
+	REQUIRE(s);
+	REQUIRE(*s == value);
+}
+
+TEST_CASE("getenv: non-existing value", "[getenv]")
+{
+	auto constexpr *name = "NIHIL_TEST_VAR";
+
+	REQUIRE(::unsetenv(name) == 0);
+
+	auto const s = nihil::getenv(name);
+	REQUIRE(!s);
+	REQUIRE(s.error() == std::errc::no_such_file_or_directory);
+}
+
+// Force the call to getenv_r() to reallocate.
+TEST_CASE("getenv: long value")
+{
+	auto constexpr *name = "NIHIL_TEST_VAR";
+	auto const value = std::string(4096, 'a');
+
+	REQUIRE(::setenv(name, value.c_str(), 1) == 0);
+
+	auto const s = nihil::getenv(name);
+	REQUIRE(s);
+	REQUIRE(*s == value);
+}