Allow setting up loc and tool data config files for testing cache data.

Requires small changes to Galaxy which will be available in the December release.

As an example see the following example tweaks to picard wrappers to enable this - jmchilton/picard@4df8974.

planemo/galaxy_config.py

@@ -95,21 +95,37 @@ def find_test_data(path, **kwds):
     if test_data:
         return os.path.abspath(test_data)
     else:
-        if not os.path.isdir(path):
-            tool_dir = os.path.dirname(path)
-        else:
-            tool_dir = path
-        for possible_dir in [tool_dir, "."]:
-            test_data = os.path.join(possible_dir, "test-data")
-            if os.path.exists(test_data):
-                return test_data
+        test_data = __search_tool_path_for(path, "test-data")
+        if test_data:
+            return test_data
     warn(NO_TEST_DATA_MESSAGE)
     return None
 
 
+def find_tool_data_table(path, **kwds):
+    tool_data_table = kwds.get("tool_data_table", None)
+    if tool_data_table:
+        return os.path.abspath(tool_data_table)
+    else:
+        return __search_tool_path_for(path, "tool_data_table_conf.xml.test")
+
+
+def __search_tool_path_for(path, target):
+    if not os.path.isdir(path):
+        tool_dir = os.path.dirname(path)
+    else:
+        tool_dir = path
+    for possible_dir in [tool_dir, "."]:
+        possible_path = os.path.join(possible_dir, target)
+        if os.path.exists(possible_path):
+            return possible_path
+    return None
+
+
 @contextlib.contextmanager
 def galaxy_config(tool_path, for_tests=False, **kwds):
     test_data_dir = find_test_data(tool_path, **kwds)
+    tool_data_table = find_tool_data_table(tool_path, **kwds)
     if kwds.get("install_galaxy", None):
         galaxy_root = None
     else:
@@ -170,6 +186,7 @@ def config_join(*args):
             id_secret="${id_secret}",
             log_level="${log_level}",
             debug="${debug}",
+            tool_data_table_config_path=tool_data_table,
             integrated_tool_panel_config=("${temp_directory}/"
                                           "integrated_tool_panel_conf.xml"),
             # Use in-memory database for kombu to avoid database contention