X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FIPv4Address.hs;h=7e502125722cbfb354a53d517acd206a3fe678ad;hb=0aa85b3d0ae468def9ee478579cd6558aea5cde3;hp=698594437d7f4a4b0470e96fc67d743221b2a5aa;hpb=6b71fc1e444cc95acdef91ad814e4f97b01ec52e;p=hath.git

diff --git a/src/IPv4Address.hs b/src/IPv4Address.hs
index 6985944..7e50212 100644
--- a/src/IPv4Address.hs
+++ b/src/IPv4Address.hs
@@ -30,7 +30,7 @@ data IPv4Address =
                 octet2 :: Octet,
                 octet3 :: Octet,
                 octet4 :: Octet }
-    deriving (Eq)
+    deriving (Eq, Ord)
 
 
 instance Show IPv4Address where
@@ -341,6 +341,10 @@ ipv4address_tests =
     test_minBound,
     test_most_sig_bit_different1,
     test_most_sig_bit_different2,
+    test_ord_instance1,
+    test_ord_instance2,
+    test_ord_instance3,
+    test_ord_instance4,
     test_to_enum ]
 
 ipv4address_properties :: TestTree
@@ -429,3 +433,45 @@ test_to_enum =
     desc     = "192.168.0.0 in base-10 is 3232235520"
     expected = mk_testaddr 192 168 0 0
     actual   = toEnum 3232235520 :: IPv4Address
+
+
+test_ord_instance1 :: TestTree
+test_ord_instance1 =
+  testCase desc $ actual @?= expected
+  where
+    desc     = "127.0.0.0 is less than 127.0.0.1"
+    addr1 = mk_testaddr 127 0 0 0
+    addr2 = mk_testaddr 127 0 0 1
+    expected = True
+    actual   = addr1 <= addr2
+
+
+test_ord_instance2 :: TestTree
+test_ord_instance2 =
+  testCase desc $ actual @?= expected
+  where
+    desc     = "127.0.0.0 is less than 127.0.1.0"
+    addr1 = mk_testaddr 127 0 0 0
+    addr2 = mk_testaddr 127 0 1 0
+    expected = True
+    actual   = addr1 <= addr2
+
+test_ord_instance3 :: TestTree
+test_ord_instance3 =
+  testCase desc $ actual @?= expected
+  where
+    desc     = "127.0.0.0 is less than 127.1.0.0"
+    addr1 = mk_testaddr 127 0 0 0
+    addr2 = mk_testaddr 127 1 0 0
+    expected = True
+    actual   = addr1 <= addr2
+
+test_ord_instance4 :: TestTree
+test_ord_instance4 =
+  testCase desc $ actual @?= expected
+  where
+    desc     = "127.0.0.0 is less than 128.0.0.0"
+    addr1 = mk_testaddr 127 0 0 0
+    addr2 = mk_testaddr 128 0 0 0
+    expected = True
+    actual   = addr1 <= addr2