Test for maxclients.

tests/test_helper.tcl

@@ -38,6 +38,7 @@ set ::all_tests {
     unit/scripting
     unit/maxmemory
     unit/introspection
+    unit/limits
     unit/obuf-limits
     unit/dump
 }

tests/unit/limits.tcl

+start_server {tags {"limits"} overrides {maxclients 10}} {
+    test {Check if maxclients works refusing connections} {
+        set c 0
+        catch {
+            while 1 {
+                incr c
+                redis_deferring_client
+            }
+        } e
+        assert {$c > 8 && $c <= 10}
+        set e
+    } {*ERR max*reached*}
+}