Add util_ArgParsing test

ArgsManager test coverage for parsing of integer and boolean values is
currently very poor and doesn't give us a way of knowing whether changes to
ArgsManager may unintentionally break backwards compatibility, so this adds a
new test to catch regressions.

src/test/util_tests.cpp

@@ -231,6 +231,60 @@ BOOST_AUTO_TEST_CASE(util_ParseParameters)
     BOOST_CHECK(testArgs.GetArgs("-ccc").size() == 2);
 }
 
+static void TestParse(const std::string& str, bool expected_bool, int64_t expected_int)
+{
+    TestArgsManager test;
+    test.SetupArgs({{"-value", ArgsManager::ALLOW_ANY}});
+    std::string arg = "-value=" + str;
+    const char* argv[] = {"ignored", arg.c_str()};
+    std::string error;
+    BOOST_CHECK(test.ParseParameters(2, (char**)argv, error));
+    BOOST_CHECK_EQUAL(test.GetBoolArg("-value", false), expected_bool);
+    BOOST_CHECK_EQUAL(test.GetBoolArg("-value", true), expected_bool);
+    BOOST_CHECK_EQUAL(test.GetArg("-value", 99998), expected_int);
+    BOOST_CHECK_EQUAL(test.GetArg("-value", 99999), expected_int);
+}
+
+// Test bool and int parsing.
+BOOST_AUTO_TEST_CASE(util_ArgParsing)
+{
+    // Some of these cases could be ambiguous or surprising to users, and might
+    // be worth triggering errors or warnings in the future. But for now basic
+    // test coverage is useful to avoid breaking backwards compatibility
+    // unintentionally.
+    TestParse("", true, 0);
+    TestParse(" ", false, 0);
+    TestParse("0", false, 0);
+    TestParse("0 ", false, 0);
+    TestParse(" 0", false, 0);
+    TestParse("+0", false, 0);
+    TestParse("-0", false, 0);
+    TestParse("5", true, 5);
+    TestParse("5 ", true, 5);
+    TestParse(" 5", true, 5);
+    TestParse("+5", true, 5);
+    TestParse("-5", true, -5);
+    TestParse("0 5", false, 0);
+    TestParse("5 0", true, 5);
+    TestParse("050", true, 50);
+    TestParse("0.", false, 0);
+    TestParse("5.", true, 5);
+    TestParse("0.0", false, 0);
+    TestParse("0.5", false, 0);
+    TestParse("5.0", true, 5);
+    TestParse("5.5", true, 5);
+    TestParse("x", false, 0);
+    TestParse("x0", false, 0);
+    TestParse("x5", false, 0);
+    TestParse("0x", false, 0);
+    TestParse("5x", true, 5);
+    TestParse("0x5", false, 0);
+    TestParse("false", false, 0);
+    TestParse("true", false, 0);
+    TestParse("yes", false, 0);
+    TestParse("no", false, 0);
+}
+
 BOOST_AUTO_TEST_CASE(util_GetBoolArg)
 {
     TestArgsManager testArgs;