Add failing test for postgresql numeric without scale and precision

test/models/data_types.rb

@@ -10,6 +10,7 @@ def self.up
       t.column :sample_time, :time
       t.column :sample_decimal, :decimal, :precision => 15, :scale => 0
       t.column :sample_small_decimal, :decimal, :precision => 3, :scale => 2
+      t.column :sample_default_decimal, :decimal
       t.column :sample_float, :float
       t.column :sample_binary, :binary
       t.column :sample_boolean, :boolean

test/postgres_numeric_test.rb

@@ -0,0 +1,25 @@
+# To run this script, set up the following postgres user and database:
+#
+#   sudo -u postgres createuser -D -A -P blog
+#   sudo -u postgres createdb -O blog weblog_development
+#
+
+require 'jdbc_common'
+require 'db/postgres'
+
+class PostgresNumericTest < Test::Unit::TestCase
+  def setup
+    DbTypeMigration.up
+  end
+
+  def teardown
+    DbTypeMigration.down
+  end
+
+  def test_should_keep_fractional_part
+    expected = 7.3
+    actual = DbType.create(:sample_default_decimal => expected).sample_default_decimal
+
+    assert_equal expected, actual
+  end
+end