net: add test cases for parsing ipv4-mapped ipv6 address

This CL adds missing ipv4-mapped ipv6 address test cases to TestParseIP.

Change-Id: I3144d2a88d409bd515cf52f8711d407bfa81ed68
Reviewed-on: https://go-review.googlesource.com/2205
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/net/ip_test.go

diff --git a/src/net/ip_test.go b/src/net/ip_test.go
index 485ff51..604da39 100644
--- a/src/net/ip_test.go
+++ b/src/net/ip_test.go
@@ -16,12 +16,20 @@
 }{
 	{"127.0.1.2", IPv4(127, 0, 1, 2)},
 	{"127.0.0.1", IPv4(127, 0, 0, 1)},
+	{"127.001.002.003", IPv4(127, 1, 2, 3)},
+	{"::ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
+	{"::ffff:127.001.002.003", IPv4(127, 1, 2, 3)},
+	{"::ffff:7f01:0203", IPv4(127, 1, 2, 3)},
+	{"0:0:0:0:0000:ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
+	{"0:0:0:0:000000:ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
+	{"0:0:0:0::ffff:127.1.2.3", IPv4(127, 1, 2, 3)},
+
+	{"2001:4860:0:2001::68", IP{0x20, 0x01, 0x48, 0x60, 0, 0, 0x20, 0x01, 0, 0, 0, 0, 0, 0, 0x00, 0x68}},
+	{"2001:4860:0000:2001:0000:0000:0000:0068", IP{0x20, 0x01, 0x48, 0x60, 0, 0, 0x20, 0x01, 0, 0, 0, 0, 0, 0, 0x00, 0x68}},
+
 	{"127.0.0.256", nil},
 	{"abc", nil},
 	{"123:", nil},
-	{"::ffff:127.0.0.1", IPv4(127, 0, 0, 1)},
-	{"2001:4860:0:2001::68", IP{0x20, 0x01, 0x48, 0x60, 0, 0, 0x20, 0x01, 0, 0, 0, 0, 0, 0, 0x00, 0x68}},
-	{"::ffff:4a7d:1363", IPv4(74, 125, 19, 99)},
 	{"fe80::1%lo0", nil},
 	{"fe80::1%911", nil},
 	{"", nil},