[master] Unit tests for IAPREFIX compare IOAddress objects.

The unit tests used to compare the addresses in the textual formats. Since
IPv6 addresses may be presented in various ways, it led to false
positives on some OSes.

src/lib/dhcp/tests/option6_iaprefix_unittest.cc

@@ -85,15 +85,15 @@ public:
     /// @param opt IAPREFIX option being tested
     /// @param expected_type expected option type
     /// @param expected_length Expected length of the prefix.
-    /// @param expected_address Expected prefix value in the textual format.
+    /// @param expected_address Expected prefix value.
     void checkOption(Option6IAPrefix& opt, const uint16_t expected_type,
                      const uint8_t expected_length,
-                     const std::string& expected_address) {
+                     const IOAddress& expected_address) {
 
         // Check if all fields have expected values
         EXPECT_EQ(Option::V6, opt.getUniverse());
         EXPECT_EQ(expected_type, opt.getType());
-        EXPECT_EQ(expected_address, opt.getAddress().toText());
+        EXPECT_EQ(expected_address, opt.getAddress());
         EXPECT_EQ(1000, opt.getPreferred());
         EXPECT_EQ(3000000000U, opt.getValid());
         // uint8_t is often represented as a character type (char). Convert it
@@ -148,7 +148,7 @@ TEST_F(Option6IAPrefixTest, parseShort) {
 
     // The non-significant bits (above 77) of the received prefix should be
     // set to zero.
-    checkOption(*opt, D6O_IAPREFIX, 77, "2001:db8:1:0:afa8::");
+    checkOption(*opt, D6O_IAPREFIX, 77, IOAddress("2001:db8:1:0:afa8::"));
 
     // Set non-significant bits in the reference buffer to 0, so as the buffer
     // can be directly compared with the option buffer.
@@ -177,7 +177,8 @@ TEST_F(Option6IAPrefixTest, parseLong) {
     opt->pack(out_buf_);
     EXPECT_EQ(29, out_buf_.getLength());
 
-    checkOption(*opt, D6O_IAPREFIX, 128, "2001:db8:1:0:afaf:0:dead:beef");
+    checkOption(*opt, D6O_IAPREFIX, 128,
+                IOAddress("2001:db8:1:0:afaf:0:dead:beef"));
 
     checkOutputBuffer(D6O_IAPREFIX);
 
@@ -201,7 +202,7 @@ TEST_F(Option6IAPrefixTest, parseZero) {
     opt->pack(out_buf_);
     EXPECT_EQ(29, out_buf_.getLength());
 
-    checkOption(*opt, D6O_IAPREFIX, 0, "::");
+    checkOption(*opt, D6O_IAPREFIX, 0, IOAddress("::"));
 
     // Fill the address in the reference buffer with zeros.
     buf_.insert(buf_.begin() + 9, 16, 0);
@@ -223,7 +224,7 @@ TEST_F(Option6IAPrefixTest, build) {
                                                   1000, 3000000000u)));
     ASSERT_TRUE(opt);
 
-    checkOption(*opt, 12345, 77, "2001:db8:1:0:afaf:0:dead:beef");
+    checkOption(*opt, 12345, 77, IOAddress("2001:db8:1:0:afaf:0:dead:beef"));
 
     // Check if we can build it properly
     EXPECT_NO_THROW(opt->pack(out_buf_));