1 files changed, 82 insertions, 0 deletions
diff --git a/nihil.posix/open_in_path.test.cc b/nihil.posix/open_in_path.test.cc
new file mode 100644
index 0000000..13d6b49
--- /dev/null
+++ b/nihil.posix/open_in_path.test.cc
@@ -0,0 +1,82 @@
+// This source code is released into the public domain.
+
+#include <catch2/catch_test_macros.hpp>
+
+import nihil.error;
+import nihil.posix;
+
+namespace {
+
+SCENARIO("nihil::open_in_path can find /bin/sh in the default path")
+{
+	GIVEN ("A call to open_in_path for /bin/sh") {
+		auto ret = nihil::open_in_path("sh");
+
+		THEN ("The returned file descriptor should be /bin/sh") {
+			REQUIRE(ret);
+
+			auto sb1 = nihil::stat(*ret).value();
+			auto sb2 = nihil::stat("/bin/sh").value();
+			REQUIRE(sb1.st_ino == sb2.st_ino);
+			REQUIRE(sb1.st_dev == sb2.st_dev);
+		}
+	}
+}
+
+SCENARIO("nihil::open_in_path works with an explicit path")
+{
+	GIVEN ("A call to open_in_path with an explicit path") {
+		auto ret = nihil::open_in_path("sh", "/bin:/usr/bin");
+
+		THEN ("The returned file descriptor should be /bin/sh") {
+			REQUIRE(ret);
+
+			auto sb1 = nihil::stat(*ret).value();
+			auto sb2 = nihil::stat("/bin/sh").value();
+			REQUIRE(sb1.st_ino == sb2.st_ino);
+			REQUIRE(sb1.st_dev == sb2.st_dev);
+		}
+	}
+}
+
+SCENARIO("nihil::open_in_path works with an absolute path")
+{
+	GIVEN ("A call to open_in_path with an absolute filename and an empty path") {
+		auto ret = nihil::open_in_path("/bin/sh", "");
+
+		THEN ("The returned file descriptor should be /bin/sh") {
+			REQUIRE(ret);
+
+			auto sb1 = nihil::stat(*ret).value();
+			auto sb2 = nihil::stat("/bin/sh").value();
+			REQUIRE(sb1.st_ino == sb2.st_ino);
+			REQUIRE(sb1.st_dev == sb2.st_dev);
+		}
+	}
+}
+
+SCENARIO("nihil::open_in_path returns ENOENT when the executable is not found")
+{
+	GIVEN ("A call to open_in_path for a non-existent executable") {
+		auto ret = nihil::open_in_path("nihil_no_such_executable");
+
+		THEN ("The return value should be std::errc::no_such_file_or_directory") {
+			REQUIRE(!ret);
+			REQUIRE(ret.error() == std::errc::no_such_file_or_directory);
+		}
+	}
+}
+
+SCENARIO("nihil::open_in_path returns errors from open(2)")
+{
+	GIVEN ("A call to open_in_path for a non-executable file") {
+		auto ret = nihil::open_in_path("passwd", "/etc");
+
+		THEN ("The return value should be std::errc::permission_denied") {
+			REQUIRE(!ret);
+			REQUIRE(ret.error() == std::errc::permission_denied);
+		}
+	}
+}
+
+} // anonymous namespace