streams: Unit test for VectorReader class.

Jim Posen · jimpo · commit 87f2d9ee43a9 · 2018-08-25T10:02:37.000-07:00
diff --git a/src/test/streams_tests.cpp b/src/test/streams_tests.cpp
@@ -68,6 +68,51 @@ BOOST_AUTO_TEST_CASE(streams_vector_writer)
     vch.clear();
 }
 
+BOOST_AUTO_TEST_CASE(streams_vector_reader)
+{
+    std::vector<unsigned char> vch = {1, 255, 3, 4, 5, 6};
+
+    VectorReader reader(SER_NETWORK, INIT_PROTO_VERSION, vch, 0);
+    BOOST_CHECK_EQUAL(reader.size(), 6);
+    BOOST_CHECK(!reader.empty());
+
+    // Read a single byte as an unsigned char.
+    unsigned char a;
+    reader >> a;
+    BOOST_CHECK_EQUAL(a, 1);
+    BOOST_CHECK_EQUAL(reader.size(), 5);
+    BOOST_CHECK(!reader.empty());
+
+    // Read a single byte as a signed char.
+    signed char b;
+    reader >> b;
+    BOOST_CHECK_EQUAL(b, -1);
+    BOOST_CHECK_EQUAL(reader.size(), 4);
+    BOOST_CHECK(!reader.empty());
+
+    // Read a 4 bytes as an unsigned int.
+    unsigned int c;
+    reader >> c;
+    BOOST_CHECK_EQUAL(c, 100992003); // 3,4,5,6 in little-endian base-256
+    BOOST_CHECK_EQUAL(reader.size(), 0);
+    BOOST_CHECK(reader.empty());
+
+    // Reading after end of byte vector throws an error.
+    signed int d;
+    BOOST_CHECK_THROW(reader >> d, std::ios_base::failure);
+
+    // Read a 4 bytes as a signed int from the beginning of the buffer.
+    reader.seek(-6);
+    reader >> d;
+    BOOST_CHECK_EQUAL(d, 67370753); // 1,255,3,4 in little-endian base-256
+    BOOST_CHECK_EQUAL(reader.size(), 2);
+    BOOST_CHECK(!reader.empty());
+
+    // Reading after end of byte vector throws an error even if the reader is
+    // not totally empty.
+    BOOST_CHECK_THROW(reader >> d, std::ios_base::failure);
+}
+
 BOOST_AUTO_TEST_CASE(streams_serializedata_xor)
 {
     std::vector<char> in;
