etl: initial commit

cpp/etl/etl_test.cpp

@@ -0,0 +1,76 @@
+#include "etl.h"
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+
+namespace boost
+{
+
+// teach Boost.Test how to print std::pair
+template <typename K, typename V>
+inline wrap_stringstream&
+operator<<(wrap_stringstream& wrapped, std::pair<const K, V> const& item)
+{
+    return wrapped << '<' << item.first << ',' << item.second << '>';
+}
+
+}
+
+#define REQUIRE_EQUAL_CONTAINERS(left_, right_) \
+    BOOST_REQUIRE_EQUAL_COLLECTIONS(left_.begin(), left_.end(), right_.begin(), right_.end())
+
+BOOST_AUTO_TEST_CASE(transforms_one_value)
+{
+    const std::map<int, std::vector<char>> old{{1, {'A'}}};
+
+    const auto actual = etl::transform(old);
+
+    const std::map<char, int> expected{{'a', 1}};
+    REQUIRE_EQUAL_CONTAINERS(expected, actual);
+}
+
+#if defined(EXERCISM_RUN_ALL_TESTS)
+BOOST_AUTO_TEST_CASE(transforms_more_values)
+{
+    const std::map<int, std::vector<char>> old{{1, {'A', 'E', 'I', 'O', 'U'}}};
+
+    const auto actual = etl::transform(old);
+
+    const std::map<char, int> expected{{'a', 1}, {'e', 1}, {'i', 1}, {'o', 1}, {'u', 1}};
+    REQUIRE_EQUAL_CONTAINERS(expected, actual);
+}
+
+BOOST_AUTO_TEST_CASE(transforms_more_keys)
+{
+    const std::map<int, std::vector<char>> old{{1, {'A', 'E'}}, {2, {'D', 'G'}}};
+
+    const auto actual = etl::transform(old);
+
+    const std::map<char, int> expected{{'a', 1}, {'e', 1}, {'d', 2}, {'g', 2}};
+    REQUIRE_EQUAL_CONTAINERS(expected, actual);
+}
+
+BOOST_AUTO_TEST_CASE(transforms_a_full_dataset)
+{
+    const std::map<int, std::vector<char>> old{
+        {1, {'A', 'E', 'I', 'O', 'U', 'L', 'N', 'R', 'S', 'T'}},
+        {2, {'D', 'G'}},
+        {3, {'B', 'C', 'M', 'P'}},
+        {4, {'F', 'H', 'V', 'W', 'Y'}},
+        {5, {'K'}},
+        {8, {'J', 'X'}},
+        {10, {'Q', 'Z'}}
+    };
+
+    const auto actual = etl::transform(old);
+
+    const std::map<char, int> expected{
+        {'a', 1}, {'b', 3},  {'c', 3}, {'d', 2}, {'e', 1},
+        {'f', 4}, {'g', 2},  {'h', 4}, {'i', 1}, {'j', 8},
+        {'k', 5}, {'l', 1},  {'m', 3}, {'n', 1}, {'o', 1},
+        {'p', 3}, {'q', 10}, {'r', 1}, {'s', 1}, {'t', 1},
+        {'u', 1}, {'v', 4},  {'w', 4}, {'x', 8}, {'y', 4},
+        {'z', 10}
+    };
+    REQUIRE_EQUAL_CONTAINERS(expected, actual);
+}
+#endif