add filter test

Author: Jerry Cheung

test/integration/test_search.rb

@@ -4,7 +4,7 @@ class TestSearchIntegration < LDAPIntegrationTestCase
   def test_search
     entries = []
 
-    result = @ldap.search(filter: "(uid=user1)", base: "dc=rubyldap,dc=com") do |entry|
+    result = @ldap.search(base: "dc=rubyldap,dc=com") do |entry|
       assert_kind_of Net::LDAP::Entry, entry
       entries << entry
     end
@@ -16,7 +16,7 @@ def test_search
   def test_search_without_result
     entries = []
 
-    result = @ldap.search(filter: "(uid=user1)", base: "dc=rubyldap,dc=com", return_result: false) do |entry|
+    result = @ldap.search(base: "dc=rubyldap,dc=com", return_result: false) do |entry|
       assert_kind_of Net::LDAP::Entry, entry
       entries << entry
     end
@@ -25,6 +25,11 @@ def test_search_without_result
     refute_equal entries, result
   end
 
+  def test_search_filter
+    entries = @ldap.search(base: "dc=rubyldap,dc=com", filter: "(uid=user1)")
+    assert_equal 1, entries.size
+  end
+
   def test_search_constrained_attributes
     entry = @ldap.search(base: "uid=user1,ou=People,dc=rubyldap,dc=com", attributes: ["cn", "sn"]).first
     assert_equal [:cn, :dn, :sn], entry.attribute_names.sort  # :dn is always included