nucleotide_count: initial commit

cpp/nucleotide-count/nucleotide_count_test.cpp

@@ -0,0 +1,86 @@
+#include "nucleotide_count.h"
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+#include <stdexcept>
+
+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 << '>';
+}
+
+}
+
+BOOST_AUTO_TEST_CASE(has_no_nucleotides)
+{
+    const dna::counter dna("");
+    const std::map<char, int> expected{ {'A', 0}, {'T', 0}, {'C', 0}, {'G', 0} };
+
+    const auto actual = dna.nucleotide_counts();
+
+    BOOST_REQUIRE_EQUAL_COLLECTIONS(expected.begin(), expected.end(), actual.begin(), actual.end());
+}
+
+#if defined(EXERCISM_RUN_ALL_TESTS)
+BOOST_AUTO_TEST_CASE(has_no_adenosine)
+{
+    const dna::counter dna("");
+
+    BOOST_REQUIRE_EQUAL(0, dna.count('A'));
+}
+
+BOOST_AUTO_TEST_CASE(repetitive_cytidine_gets_counts)
+{
+    const dna::counter dna("CCCCC");
+
+    BOOST_REQUIRE_EQUAL(5, dna.count('C'));
+}
+
+BOOST_AUTO_TEST_CASE(repetitive_sequence_has_only_guanosine)
+{
+    const dna::counter dna("GGGGGGGG");
+    const std::map<char, int> expected{ {'A', 0}, {'T', 0}, {'C', 0}, {'G', 8} };
+
+    const auto actual = dna.nucleotide_counts();
+
+    BOOST_REQUIRE_EQUAL_COLLECTIONS(expected.begin(), expected.end(), actual.begin(), actual.end());
+}
+
+BOOST_AUTO_TEST_CASE(counts_only_thymidine)
+{
+    const dna::counter dna("GGGGTAACCCGG");
+
+    BOOST_REQUIRE_EQUAL(1, dna.count('T'));
+}
+
+BOOST_AUTO_TEST_CASE(counts_a_nucleotide_only_once)
+{
+    const dna::counter dna("GGTTGG");
+
+    dna.count('T');
+
+    BOOST_REQUIRE_EQUAL(2, dna.count('T'));
+}
+
+BOOST_AUTO_TEST_CASE(validates_nucleotides)
+{
+    const dna::counter dna("GGTTGG");
+
+    BOOST_REQUIRE_THROW(dna.count('X'), std::invalid_argument);
+}
+
+BOOST_AUTO_TEST_CASE(counts_all_nucleotides)
+{
+    const dna::counter dna("AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC");
+    std::map<char, int> expected{ {'A', 20}, {'T', 21}, {'G', 17}, {'C', 12} };
+
+    auto actual = dna.nucleotide_counts();
+
+    BOOST_REQUIRE_EQUAL_COLLECTIONS(expected.begin(), expected.end(), actual.begin(), actual.end());
+}
+#endif