[upstream_utils] Import argparse to wpiutil (#7071)

wpiutil/src/test/native/cpp/argparse/ArgumentParserTest.cpp

@@ -0,0 +1,18 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include <gtest/gtest.h>
+
+#include "wpi/argparse.h"
+
+TEST(ArgparseTest, Basic) {
+  wpi::ArgumentParser program("ArgparseTest");
+
+  program.add_argument("test").help("Test argument").scan<'i', int>();
+
+  constexpr const char* args[] = {"foo", "42"};
+  EXPECT_NO_THROW(program.parse_args(2, args));
+  auto result = program.get<int>("test");
+  EXPECT_EQ(42, result);
+}