Move filter unit tests to their own file

CMakeLists.txt

@@ -432,6 +432,7 @@ target_sources(containers_test PRIVATE
 		test/containers/sort/test_sort.cpp
 		test/containers/algorithms/copy_or_relocate_from.cpp
 		test/containers/algorithms/erase.cpp
+		test/containers/algorithms/filter.cpp
 		test/containers/algorithms/split.cpp
 		test/containers/algorithms/zip.cpp
 		test/containers/append.cpp

source/containers/algorithms/filter.cpp

@@ -13,10 +13,9 @@ module;
 export module containers.algorithms.filter;
 
 import containers.algorithms.advance;
-import containers.algorithms.compare;
 import containers.algorithms.find;
+
 import containers.adapt_iterator;
-import containers.array;
 import containers.begin_end;
 import containers.default_adapt_traits;
 import containers.default_begin_end_size;
@@ -132,12 +131,3 @@ template<typename Range, typename UnaryPredicate>
 filter(Range &&, UnaryPredicate) -> filter<Range, UnaryPredicate>;
 
 } // namespace containers
-
-constexpr auto check_filter() {
-	constexpr auto source = containers::array{1_bi, 2_bi, 3_bi, 2_bi, 4_bi, 5_bi, 6_bi, 8_bi};
-	constexpr auto expected = containers::array{2_bi, 2_bi, 4_bi, 6_bi, 8_bi};
-	auto const filtered = containers::filter(source, [](auto const integer) { return integer % 2_bi == 0_bi; });
-	return containers::equal(filtered, expected);
-}
-
-static_assert(check_filter());

test/containers/algorithms/filter.cpp

@@ -0,0 +1,31 @@
+// Copyright David Stone 2023.
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+export module containers.test.algorithms.filter;
+
+import containers.algorithms.compare;
+import containers.algorithms.filter;
+
+import containers.array;
+
+import bounded;
+
+using namespace bounded::literal;
+
+// https://github.com/llvm/llvm-project/issues/59513
+struct is_even {
+	static constexpr auto operator()(auto const integer) {
+		return integer % 2_bi == 0_bi;
+	}
+};
+
+constexpr auto check_filter() {
+	constexpr auto source = containers::array{1_bi, 2_bi, 3_bi, 2_bi, 4_bi, 5_bi, 6_bi, 8_bi};
+	constexpr auto expected = containers::array{2_bi, 2_bi, 4_bi, 6_bi, 8_bi};
+	auto const filtered = containers::filter(source, is_even());
+	return containers::equal(filtered, expected);
+}
+
+static_assert(check_filter());