diff --git a/.coveragerc b/.coveragerc
index 7baf518..be47e62 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -10,4 +10,6 @@ omit =
     *_version.py
 
 exclude_lines =
+    pragma: no cover
+    raise ImportError
     if __name__ == '__main__':
diff --git a/.travis.yml b/.travis.yml
index 5dbf2ec..d7e6cde 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -53,10 +53,11 @@ before_install:
 
 install:
   - export GIT_FULL_HASH=`git rev-parse HEAD`
-  - conda create -n testenv nose python=$TRAVIS_PYTHON_VERSION pytest coverage pip databroker bluesky flake8 pyFAI mongoquery codecov attrs metadatastore filestore -c conda-forge -c lightsource2-tag -c soft-matter
+  - conda create -n testenv nose python=$TRAVIS_PYTHON_VERSION pytest coverage pip databroker flake8 pyFAI mongoquery codecov attrs metadatastore filestore -c conda-forge -c lightsource2-tag -c soft-matter
   - source activate testenv
   - 'pip install https://github.com/NSLS-II/portable-mds/zipball/master#egg=portable_mds'
   - 'pip install https://github.com/NSLS-II/portable-fs/zipball/master#egg=portable_fs'
+  - 'pip install https://github.com/NSLS-II/bluesky/zipball/master#egg=bluesky'
   - python setup.py install
   # Need to clean the python build directory (and other cruft) or pytest is
   # going to find the build directory and get confused why there are two sets
diff --git a/xpdsim/dets.py b/xpdsim/dets.py
index b243426..0252831 100644
--- a/xpdsim/dets.py
+++ b/xpdsim/dets.py
@@ -23,7 +23,6 @@
 from cycler import cycler
 from pims import ImageSequence
 from pkg_resources import resource_filename as rs_fn
-from bluesky.utils import new_uid
 
 DATA_DIR = rs_fn('xpdsim', 'data/')
 
@@ -75,39 +74,19 @@ def __init__(self, name, read_fields, fs, shutter=None,
         else:
             self._dark_fields = None
 
-    def trigger(self):
+    def trigger_read(self):
         if self.shutter and self._dark_fields and \
-                        self.shutter.read()['rad']['value'] == 0:
-            read_v = {field: {'value': func(), 'timestamp': ttime.time()}
-                      for field, func in self._dark_fields.items()
-                      if field in self.read_attrs}
-            self._result.clear()
-            for idx, (name, reading) in enumerate(read_v.items()):
-                # Save the actual reading['value'] to disk and create a record
-                # in FileStore.
-                np.save('{}_{}.npy'.format(self._path_stem, idx),
-                        reading['value'])
-                datum_id = new_uid()
-                self.fs.insert_datum(self._resource_id, datum_id,
-                                     dict(index=idx))
-                # And now change the reading in place, replacing the value with
-                # a reference to FileStore.
-                reading['value'] = datum_id
-                self._result[name] = reading
-
-            delay_time = self.exposure_time
-            if delay_time:
-                if self.loop.is_running():
-                    st = be.SimpleStatus()
-                    self.loop.call_later(delay_time, st._finished)
-                    return st
-                else:
-                    ttime.sleep(delay_time)
-
-            return be.NullStatus()
-
+                self.shutter.read()['rad']['value'] == 0:
+            rv = {field: {'value': func(), 'timestamp': ttime.time()}
+                  for field, func in self._dark_fields.items()
+                  if field in self.read_attrs}
+            print('======Triggered shutter======')
+            print(rv)
         else:
-            return super().trigger()
+            rv = super().trigger_read()
+        read_v = dict(rv)
+        read_v['pe1_image']['value'] = read_v['pe1_image']['value'].copy()
+        return read_v
 
 
 def build_image_cycle(path):
diff --git a/xpdsim/tests/conftest.py b/xpdsim/tests/conftest.py
index 77b0743..e1221c6 100644
--- a/xpdsim/tests/conftest.py
+++ b/xpdsim/tests/conftest.py
@@ -28,9 +28,9 @@
                               [build_pymongo_backed_broker,
                                build_sqlite_backed_broker],
                               ['metadatastore', 'portable_mds']):
-    try:
+    try:  # pragma: no cover
         importlib.import_module(mod)
-    except ImportError:
+    except ImportError:  # pragma: no cover
         pass
     else:
         params.append(name)
diff --git a/xpdsim/tests/test_dets.py b/xpdsim/tests/test_dets.py
index d7c4f27..72221cd 100644
--- a/xpdsim/tests/test_dets.py
+++ b/xpdsim/tests/test_dets.py
@@ -41,12 +41,13 @@ def test_dets_shutter(db, tmp_dir, name, fp):
     for n, d in db.restream(db[-1], fill=True):
         if n == 'event':
             assert_array_equal(d['data']['pe1_image'],
-                               np.zeros(next(cg)['pe1_image'].shape))
+                               np.zeros(d['data']['pe1_image'].shape))
     assert uid is not None
 
     # With the shutter up
     RE(abs_set(shctl1, 1, wait=True))
     uid = RE(scan)
+    next(cg)
     for n, d in db.restream(db[-1], fill=True):
         if n == 'event':
             assert_array_equal(d['data']['pe1_image'], next(cg)['pe1_image'])