Make IP address checking more obvious, and add tests for the net module.

tests/stdlib/tnet.nim

@@ -0,0 +1,47 @@
+import net
+import unittest
+
+suite "isIpAddress tests":
+  test "127.0.0.1 is valid":
+    check isIpAddress("127.0.0.1") == true
+
+  test "ipv6 localhost is valid":
+    check isIpAddress("::1") == true
+
+  test "fqdn is not an ip address":
+    check isIpAddress("example.com") == false
+
+  test "random string is not an ipaddress":
+    check isIpAddress("foo bar") == false
+
+  test "5127.0.0.1 is invalid":
+    check isIpAddress("5127.0.0.1") == false
+
+  test "ipv6 is valid":
+    check isIpAddress("2001:cdba:0000:0000:0000:0000:3257:9652") == true
+
+  test "invalid ipv6":
+    check isIpAddress("gggg:cdba:0000:0000:0000:0000:3257:9652") == false
+
+
+suite "parseIpAddress tests":
+  test "127.0.0.1 is valid":
+    discard parseIpAddress("127.0.0.1")
+
+  test "ipv6 localhost is valid":
+    discard parseIpAddress("::1")
+
+  test "fqdn is not an ip address":
+    expect(ValueError):
+      discard parseIpAddress("example.com")
+
+  test "random string is not an ipaddress":
+    expect(ValueError):
+      discard parseIpAddress("foo bar")
+
+  test "ipv6 is valid":
+    discard parseIpAddress("2001:cdba:0000:0000:0000:0000:3257:9652")
+
+  test "invalid ipv6":
+    expect(ValueError):
+      discard parseIpAddress("gggg:cdba:0000:0000:0000:0000:3257:9652")