rework the test for better behaviour along other tests

tests/test_sql.py

@@ -1188,15 +1188,19 @@ def test_sql_criteria_fts(pub):
 def test_search_tokens_purge(pub):
     _, cur = sql.get_connection_and_cursor()
 
+    def token_exists(token):
+        cur.execute('SELECT count(*) FROM wcs_search_tokens WHERE token=%s;', token)
+        return cur.fetchone()[0] == 1
+
     # purge garbage from other tests
     FormDef.wipe()
     sql.purge_obsolete_search_tokens()
 
-    cur.execute('SELECT count(*) FROM wcs_search_tokens;')
-    start = cur.fetchone()[0]
+    # make sure the existing situation is clean for the test
+    assert not(token_exists('tableselectftstoken'))
+    assert not(token_exists('foofortokensofcours'))
+    assert not(token_exists('chaussettefortokensofcours'))
 
-    cur.execute("SELECT * FROM wcs_search_tokens;")
-    print(cur.fetchall())
     # define a new table
     test_formdef = FormDef()
     test_formdef.name = 'tableSelectFTStokens'
@@ -1204,42 +1208,26 @@ def test_search_tokens_purge(pub):
     test_formdef.store()
     data_class = test_formdef.data_class(mode='sql')
 
-    cur.execute('SELECT count(*) FROM wcs_search_tokens;')
-    assert cur.fetchone()[0] == start + 1
-
-    cur.execute("SELECT * FROM wcs_search_tokens;")
-    print(cur.fetchall())
+    assert token_exists('tableselectftstoken')
 
     t = data_class()
     t.data = {'3': 'foofortokensofcourse'}
     t.just_created()
     t.store()
 
-    cur.execute("SELECT * FROM wcs_search_tokens;")
-    print(cur.fetchall())
-
-    # 3 elements are indexed here, ids and field
-    cur.execute('SELECT count(*) FROM wcs_search_tokens;')
-    assert cur.fetchone()[0] == start + 4
+    assert token_exists('foofortokensofcours')
 
     t.data = {'3': 'chaussettefortokensofcourse'}
     t.store()
 
     # one additional element
-    cur.execute("SELECT * FROM wcs_search_tokens;")
-    print(cur.fetchall())
-
-    cur.execute('SELECT count(*) FROM wcs_search_tokens;')
-    assert cur.fetchone()[0] == start + 5
+    assert token_exists('foofortokensofcours')
+    assert token_exists('chaussettefortokensofcours')
 
     sql.purge_obsolete_search_tokens()
 
-    cur.execute("SELECT * FROM wcs_search_tokens;")
-    print(cur.fetchall())
-
-    # should be back to the previous step
-    cur.execute('SELECT count(*) FROM wcs_search_tokens;')
-    assert cur.fetchone()[0] == start + 4
+    assert not(token_exists('foofortokensofcours'))
+    assert token_exists('chaussettefortokensofcours')
 
 
 def table_exists(cur, table_name):