test: server_spec: Tolerate missing protocol (#7478)

Travis disabled IPv6:

[ RUN      ] serverstart(), serverstop() parses endpoints correctly: FAIL
...build/neovim/neovim/test/functional/eval/server_spec.lua:83: Expected objects to be the same.
Passed in:
(table) {
  [1] = '127.0.0.1:12345' }
Expected:
(table) {
  [1] = '127.0.0.1:12345'
 *[2] = '::1:12345' }

Change all tests to ensure a server was actually started before
expecting it to be returned from serverlist().

1 files changed, 17 insertions, 1 deletions

diff --git a/test/functional/api/server_requests_spec.lua b/test/functional/api/server_requests_spec.lua
index 4380e52b8b..a2a198ca83 100644
--- a/test/functional/api/server_requests_spec.lua
+++ b/test/functional/api/server_requests_spec.lua
@@ -304,14 +304,30 @@ describe('server -> client', function()
       connect_test(server, 'pipe', address)
     end)
 
-    it('via ip address', function()
+    it('via ipv4 address', function()
       local server = spawn(nvim_argv)
       set_session(server)
       local address = funcs.serverstart("127.0.0.1:")
+      if #address == 0 then
+        pending('no ipv4 stack', function() end)
+        return
+      end
       eq('127.0.0.1:', string.sub(address,1,10))
       connect_test(server, 'tcp', address)
     end)
 
+    it('via ipv6 address', function()
+      local server = spawn(nvim_argv)
+      set_session(server)
+      local address = funcs.serverstart('::1:')
+      if #address == 0 then
+        pending('no ipv6 stack', function() end)
+        return
+      end
+      eq('::1:', string.sub(address,1,4))
+      connect_test(server, 'tcp', address)
+    end)
+
     it('via hostname', function()
       local server = spawn(nvim_argv)
       set_session(server)