Add missing ostrich bindings mock

Author: rubensworks

packages/actor-rdf-resolve-quad-pattern-ostrich/test/__mocks__/ostrich-bindings.js

@@ -0,0 +1,14 @@
+// Mocked OSTRICH package
+let store;
+module.exports = {
+  __setMockedDocument: function(storeArg) {
+    store = storeArg;
+  },
+  fromPath: function (file) {
+    if (!file) {
+      return Promise.reject(new Error('File not found'))
+    } else {
+      return Promise.resolve(store);
+    }
+  }
+};