Move tests to runtime

test/runtime/quantity_test.cpp

@@ -0,0 +1,74 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2024 Chip Hogg
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include <catch2/catch_test_macros.hpp>
+#ifdef MP_UNITS_IMPORT_STD
+import std;
+#else
+#include <atomic>
+#endif
+#ifdef MP_UNITS_MODULES
+import mp_units;
+#else
+#include <mp-units/math.h>
+#include <mp-units/systems/si.h>
+#endif
+
+using namespace mp_units;
+using namespace mp_units::si::unit_symbols;
+
+namespace {
+
+template<typename T>
+constexpr bool within_4_ulps(T a, T b)
+{
+  static_assert(std::is_floating_point_v<T>);
+  auto walk_ulps = [](T x, int n) {
+    while (n > 0) {
+      x = std::nextafter(x, std::numeric_limits<T>::infinity());
+      --n;
+    }
+    while (n < 0) {
+      x = std::nextafter(x, -std::numeric_limits<T>::infinity());
+      ++n;
+    }
+    return x;
+  };
+
+  return (walk_ulps(a, -4) <= b) && (b <= walk_ulps(a, 4));
+}
+
+}  // namespace
+
+// conversion requiring radical magnitudes
+TEST_CASE("unit conversions support radical magnitudes", "[conversion][radical]")
+{
+  REQUIRE(within_4_ulps(sqrt((1.0 * m) * (1.0 * km)).numerical_value_in(m), sqrt(1000.0)));
+}
+
+// Reproducing issue #474 exactly:
+TEST_CASE("Issue 474 is fixed", "[conversion][radical]")
+{
+  constexpr auto val_issue_474 = 8.0 * si::si2019::boltzmann_constant * 1000.0 * K / (std::numbers::pi * 10 * Da);
+  REQUIRE(within_4_ulps(sqrt(val_issue_474).numerical_value_in(m / s),
+                        sqrt(val_issue_474.numerical_value_in(m * m / s / s))));
+}