Fix undefined method 'to_ber' for nil:NilClass. Convert unless nil.

Made modify_ops a method to allow for unit testing of it.

Added unit tests for add, delete and replace.

lib/net/ldap.rb

@@ -1456,6 +1456,20 @@ class Net::LDAP::Connection #:nodoc:
     result_code
   end
 
+  def self.modify_ops args
+      modify_ops = []
+      a = args[:operations] and a.each {|op, attr, values|
+        # TODO, fix the following line, which gives a bogus error
+        # if the opcode is invalid.
+        op_1 = {:add => 0, :delete => 1, :replace => 2} [op.to_sym].to_ber_enumerated
+        values = [values].flatten.map { |v|
+            v.to_ber unless v.nil?
+        }.to_ber_set
+        modify_ops << [op_1,[attr.to_s.to_ber,values].to_ber_sequence].to_ber
+      }
+      modify_ops
+  end
+
   #--
   # TODO: need to support a time limit, in case the server fails to respond.
   # TODO: We're throwing an exception here on empty DN. Should return a
@@ -1465,14 +1479,7 @@ class Net::LDAP::Connection #:nodoc:
   #++
   def modify(args)
     modify_dn = args[:dn] or raise "Unable to modify empty DN"
-    modify_ops = []
-    a = args[:operations] and a.each { |op, attr, values|
-      # TODO, fix the following line, which gives a bogus error if the
-      # opcode is invalid.
-      op_1 = { :add => 0, :delete => 1, :replace => 2 }[op.to_sym].to_ber_enumerated
-      modify_ops << [op_1, [attr.to_s.to_ber, Array(values).map { |v| v.to_ber unless v.nil? }.to_ber_set].to_ber_sequence].to_ber_sequence
-    }
-
+    modify_ops = modify_ops args[:operations]
     request = [modify_dn.to_ber,
       modify_ops.to_ber_sequence].to_ber_appsequence(6)
     pkt = [next_msgid.to_ber, request].to_ber_sequence

test/test_ldap_connection.rb

@@ -0,0 +1,24 @@
+require 'common'
+
+class TestLDAP < Test::Unit::TestCase
+    def test_modify_ops_delete
+        args = {:operations=>[[:delete, "mail"]]}
+        result = Net::LDAP::Connection.modify_ops(args)
+        expected = ["0\r\n\x01\x010\b\x04\x04mail1\x00"]
+        assert_equal(expected, result)
+    end
+
+    def test_modify_ops_add
+        args = {:operations=>[[:add, "mail", "testuser@example.com"]]}
+        result = Net::LDAP::Connection.modify_ops(args)
+        expected = ["0#\n\x01\x000\x1E\x04\x04mail1\x16\x04\x14testuser@example.com"]
+        assert_equal(expected, result)
+    end
+
+    def test_modify_ops_replace
+        args = {:operations=>[[:replace, "mail", "testuser@example.com"]]}
+        result = Net::LDAP::Connection.modify_ops(args)
+        expected = ["0#\n\x01\x020\x1E\x04\x04mail1\x16\x04\x14testuser@example.com"]
+        assert_equal(expected, result)
+    end
+end