Enable ImportSupport on Postgresql - the test suite now passes in full

lib/activerecord-import/adapters/postgresql_adapter.rb

@@ -1,5 +1,11 @@
 module ActiveRecord::Import::PostgreSQLAdapter
   module InstanceMethods
+    def self.included(klass)
+      klass.instance_eval do
+        include ActiveRecord::Import::ImportSupport
+      end
+    end
+
     def next_value_for_sequence(sequence_name)
       %{nextval('#{sequence_name}')}
     end

test/postgresql/import_test.rb

@@ -0,0 +1,20 @@
+require File.expand_path('../../test_helper', __FILE__)
+
+describe "#supports_imports?" do
+  it "should support import" do
+    assert ActiveRecord::Base.supports_import?
+  end
+end
+
+describe "#import" do
+  it "should import with a single insert" do
+    # see ActiveRecord::ConnectionAdapters::AbstractAdapter test for more specifics
+    assert_difference "Topic.count", +10 do
+      result = Topic.import Build(3, :topics)
+      assert_equal 1, result.num_inserts
+    
+      result = Topic.import Build(7, :topics)
+      assert_equal 1, result.num_inserts
+    end
+  end
+end