--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/light9/localsyncedgraph.py	Fri May 19 14:38:56 2023 -0700
@@ -0,0 +1,19 @@
+from rdflib import ConjunctiveGraph
+
+from rdfdb.syncedgraph.currentstategraphapi import CurrentStateGraphApi
+from rdfdb.syncedgraph.autodepgraphapi import AutoDepGraphApi
+from rdfdb.syncedgraph.grapheditapi import GraphEditApi
+from rdfdb.rdflibpatch import patchQuads
+
+
+class LocalSyncedGraph(AutoDepGraphApi, GraphEditApi):
+    """for tests"""
+
+    def __init__(self, files=None):
+        self._graph = ConjunctiveGraph()
+        for f in files or []:
+            self._graph.parse(f, format='n3')
+
+    def patch(self, p):
+        patchQuads(self._graph, deleteQuads=p.delQuads, addQuads=p.addQuads, perfect=True)
+        # no deps

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/light9/mock_syncedgraph.py	Fri May 19 14:38:56 2023 -0700
@@ -0,0 +1,59 @@
+from rdflib import Graph, RDF, RDFS
+from rdflib.parser import StringInputSource
+from rdfdb.syncedgraph.syncedgraph import SyncedGraph
+
+
+class MockSyncedGraph(SyncedGraph):
+    """
+    Lets users of SyncedGraph mostly work. Doesn't yet help with any
+    testing of the rerun-upon-graph-change behavior.
+    """
+
+    def __init__(self, n3Content):
+        self._graph = Graph()
+        self._graph.parse(StringInputSource(n3Content), format='n3')
+
+    def addHandler(self, func):
+        func()
+
+    def value(self,
+              subject=None,
+              predicate=RDF.value,
+              object=None,
+              default=None,
+              any=True):
+        if object is not None:
+            raise NotImplementedError()
+        return self._graph.value(subject,
+                                 predicate,
+                                 object=object,
+                                 default=default,
+                                 any=any)
+
+    def objects(self, subject=None, predicate=None):
+        return self._graph.objects(subject, predicate)
+
+    def label(self, uri):
+        return self.value(uri, RDFS.label)
+
+    def subjects(self, predicate=None, object=None):
+        return self._graph.subjects(predicate, object)
+
+    def predicate_objects(self, subject):
+        return self._graph.predicate_objects(subject)
+
+    def items(self, listUri):
+        """generator. Having a chain of watchers on the results is not
+        well-tested yet"""
+        chain = set([listUri])
+        while listUri:
+            item = self.value(listUri, RDF.first)
+            if item:
+                yield item
+            listUri = self.value(listUri, RDF.rest)
+            if listUri in chain:
+                raise ValueError("List contains a recursive rdf:rest reference")
+            chain.add(listUri)
+
+    def contains(self, triple):
+        return triple in self._graph