diff --git a/src/libstore/dummy-store.cc b/src/libstore/dummy-store.cc
index 57bbcd231..852c38b75 100644
--- a/src/libstore/dummy-store.cc
+++ b/src/libstore/dummy-store.cc
@@ -16,6 +16,16 @@ std::string DummyStoreConfig::doc()
         ;
 }
 
+bool DummyStore::PathInfoAndContents::operator==(const PathInfoAndContents & other) const
+{
+    return info == other.info && contents->root == other.contents->root;
+}
+
+bool DummyStore::operator==(const DummyStore & other) const
+{
+    return contents == other.contents && derivations == other.derivations && buildTrace == other.buildTrace;
+}
+
 namespace {
 
 class WholeStoreViewAccessor : public SourceAccessor
diff --git a/src/libstore/include/nix/store/dummy-store-impl.hh b/src/libstore/include/nix/store/dummy-store-impl.hh
index 095767aaf..9b078eeaa 100644
--- a/src/libstore/include/nix/store/dummy-store-impl.hh
+++ b/src/libstore/include/nix/store/dummy-store-impl.hh
@@ -23,6 +23,8 @@ struct DummyStore : virtual Store
     {
         UnkeyedValidPathInfo info;
         ref<MemorySourceAccessor> contents;
+
+        bool operator==(const PathInfoAndContents &) const;
     };
 
     /**
@@ -54,6 +56,8 @@ struct DummyStore : virtual Store
         , config(config)
     {
     }
+
+    bool operator==(const DummyStore &) const;
 };
 
 } // namespace nix