Add MockConfigStore argument to disabled default expectations

Usually we need MockConfigStore just to pass into interface where store
is needed. Default expectations are OK there.
These expectations are not desired when we want to check data passed
into Load/Save.


Change-Id: Ia3ee784eec2fd12c4a3c81916f7cfb20f8d94e47
Reviewed-on: https://weave-review.googlesource.com/2274
Reviewed-by: Vitaly Buka <vitalybuka@google.com>

include/weave/provider/test/mock_config_store.h

diff --git a/include/weave/provider/test/mock_config_store.h b/include/weave/provider/test/mock_config_store.h
index e6411d6..a7eb374 100644
--- a/include/weave/provider/test/mock_config_store.h
+++ b/include/weave/provider/test/mock_config_store.h
@@ -18,10 +18,13 @@
 
 class MockConfigStore : public ConfigStore {
  public:
-  MockConfigStore() {
+  explicit MockConfigStore(bool set_expectations = true) {
     using testing::_;
     using testing::Return;
 
+    if (!set_expectations)
+      return;
+
     EXPECT_CALL(*this, LoadDefaults(_))
         .WillRepeatedly(testing::Invoke([](Settings* settings) {
           settings->firmware_version = "TEST_FIRMWARE";
@@ -39,8 +42,8 @@
           "version": 1,
           "device_id": "TEST_DEVICE_ID"
         })"));
-    EXPECT_CALL(*this, LoadSettings("config")).WillRepeatedly(Return(""));
-    EXPECT_CALL(*this, SaveSettings("config", _, _))
+    EXPECT_CALL(*this, LoadSettings(_)).WillRepeatedly(Return(""));
+    EXPECT_CALL(*this, SaveSettings(_, _, _))
         .WillRepeatedly(testing::WithArgs<1, 2>(testing::Invoke(
             [](const std::string& json, const DoneCallback& callback) {
               if (!callback.is_null())