adds test for spatial markov sql function

src/pg/test/sql/05_markov_test.sql

@@ -0,0 +1,15 @@
+SET client_min_messages TO WARNING;
+\set ECHO none
+\pset format unaligned
+\i test/fixtures/markov_usjoin_example.sql
+
+-- Areas of Interest functions perform some nondeterministic computations
+-- (to estimate the significance); we will set the seeds for the RNGs
+-- that affect those results to have repeatable results
+SELECT cdb_crankshaft._cdb_random_seeds(1234);
+
+SELECT m1.cartodb_id, m2.trend, m2.trend_up, m2.trend_down, m2.volatility
+  FROM markov_usjoin_example As m1
+  JOIN cdb_crankshaft.CDB_SpatialMarkov('SELECT * FROM markov_usjoin_example', Array['y1995', 'y1996', 'y1997', 'y1998', 'y1999', 'y2000', 'y2001', 'y2002', 'y2003', 'y2004', 'y2005', 'y2006', 'y2007', 'y2008', 'y2009']::text[], 5, 'knn', 5, 0, 'the_geom', 'cartodb_id') As m2
+    ON m1.cartodb_id = m2.rowid
+  ORDER BY m1.cartodb_id;