diff --git a/astropop/image/processing.py b/astropop/image/processing.py
index b6972540..ceeb8d0f 100644
--- a/astropop/image/processing.py
+++ b/astropop/image/processing.py
@@ -49,6 +49,7 @@ def cosmics_lacosmic(frame, inplace=False, **lacosmic_kwargs):
         New cosmic-rays corrected `FrameData` instance if not `inplace`,
         else the `image` `~astropop.framedata.FrameData` instance.
     """
+    frame = check_framedata(frame)
     # As lacosmic removes and replace the cosmics pixels, no need to
     # update the mask
     mask, dat = astroscrappy.detect_cosmics(frame.data, **lacosmic_kwargs)
diff --git a/tests/test_processing.py b/tests/test_processing.py
new file mode 100644
index 00000000..b03e7b68
--- /dev/null
+++ b/tests/test_processing.py
@@ -0,0 +1,56 @@
+# Licensed under a 3-clause BSD style license - see LICENSE.rst
+# flake8: noqa: F403, F405
+
+import pytest
+from astropop.image.processing import cosmics_lacosmic
+from astropop.framedata import FrameData, PixelMaskFlags
+from astropop.math import QFloat
+from astropop.testing import *
+import numpy as np
+
+
+class TestProcessingCosmics:
+    @pytest.mark.parametrize('inplace', [True, False])
+    def test_lacosmic_numpy(self, inplace):
+        arr = np.ones((10, 10))
+        arr[3, 3] = 100000
+        ccd = cosmics_lacosmic(arr, inplace=inplace)
+        assert_is_instance(ccd, FrameData)
+        assert_equal(ccd.data, np.ones((10, 10)))
+        assert_true(ccd.header['astropop lacosmic'])
+
+    @pytest.mark.parametrize('inplace', [True, False])
+    def test_lacosmic_qfloat(self, inplace):
+        arr = np.ones((10, 10))
+        arr[3, 3] = 100000
+        ccd = cosmics_lacosmic(QFloat(arr, unit='adu'), inplace=inplace)
+        assert_is_instance(ccd, FrameData)
+        assert_equal(ccd.data, np.ones((10, 10)))
+        assert_true(ccd.header['astropop lacosmic'])
+
+    @pytest.mark.parametrize('inplace', [True, False])
+    def test_lacosmic_framedata(self, inplace):
+        arr = np.ones((10, 10))
+        arr[3, 3] = 100000
+        frame = FrameData(arr, unit='adu')
+        ccd = cosmics_lacosmic(frame, inplace=inplace)
+        assert_is_instance(ccd, FrameData)
+        assert_equal(ccd.data, np.ones((10, 10)))
+        assert_true(ccd.header['astropop lacosmic'])
+        if inplace:
+            assert_is(ccd, frame)
+
+    @pytest.mark.parametrize('inplace', [True, False])
+    def test_lacosmic_mask(self, inplace):
+        arr = np.ones((10, 10))
+        arr[3, 3] = 100000
+        mask = np.zeros((10, 10), dtype='uint8')
+        mask[3, 3] |= PixelMaskFlags.COSMIC_RAY.value
+        mask[3, 3] |= PixelMaskFlags.INTERPOLATED.value
+        ccd = cosmics_lacosmic(arr, inplace=inplace)
+        assert_is_instance(ccd, FrameData)
+        assert_equal(ccd.data, np.ones((10, 10)))
+        assert_equal(ccd.flags, mask)
+        assert_equal(ccd.mask, np.zeros((10, 10), dtype=bool))
+        assert_true(ccd.header['astropop lacosmic'])
+