diff --git a/dfdewey/utils/index_searcher.py b/dfdewey/utils/index_searcher.py
index 6b6c345..ed3b667 100644
--- a/dfdewey/utils/index_searcher.py
+++ b/dfdewey/utils/index_searcher.py
@@ -97,7 +97,7 @@ class IndexSearcher():
       location: Partition number
 
     Returns:
-      Filename of given inode or None
+      Filename(s) of given inode or None
     """
     results = self.postgresql.query((
         'SELECT filename FROM files '
@@ -107,8 +107,8 @@ class IndexSearcher():
       filenames.append(result[0])
     return filenames
 
-  def _get_filename_from_offset(self, image_path, image_hash, offset):
-    """Gets filename given a byte offset within an image.
+  def _get_filenames_from_offset(self, image_path, image_hash, offset):
+    """Gets filename(s) given a byte offset within an image.
 
     Args:
       image_path: source image path.
@@ -116,7 +116,7 @@ class IndexSearcher():
       offset: byte offset within the image.
 
     Returns:
-      Filename allocated to the given offset, or None.
+      Filename(s) allocated to the given offset, or None.
     """
     filenames = []
 
@@ -295,7 +295,7 @@ class IndexSearcher():
           file_offset = '\n'.join(file_offset)
           offset = '\n'.join((offset, file_offset))
         hit.offset = offset
-        filenames = self._get_filename_from_offset(
+        filenames = self._get_filenames_from_offset(
             image_path, image_hash, result['_source']['offset'])
         filenames = self._wrap_filenames(filenames)
         hit.filename = '\n'.join(filenames)
diff --git a/dfdewey/utils/index_searcher_test.py b/dfdewey/utils/index_searcher_test.py
new file mode 100644
index 0000000..4ba51bd
--- /dev/null
+++ b/dfdewey/utils/index_searcher_test.py
@@ -0,0 +1,112 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Tests for index searcher."""
+
+import os
+import unittest
+
+import mock
+
+from dfdewey.utils.image_processor import FileEntryScanner
+from dfdewey.utils.index_searcher import IndexSearcher
+
+TEST_CASE = 'testcase'
+TEST_IMAGE = 'test.dd'
+TEST_IMAGE_HASH = 'd41d8cd98f00b204e9800998ecf8427e'
+
+
+class IndexSearcherTest(unittest.TestCase):
+  """Tests for index searcher."""
+
+  def _get_index_searcher(self):
+    """Get a test index searcher.
+
+    Returns:
+      Test index searcher.
+    """
+    with mock.patch('psycopg2.connect'), mock.patch(
+        'dfdewey.datastore.postgresql.PostgresqlDataStore.query_single_row'
+    ) as mock_query_single_row:
+      mock_query_single_row.return_value = (TEST_IMAGE_HASH,)
+      index_searcher = IndexSearcher(TEST_CASE, TEST_IMAGE)
+    return index_searcher
+
+  @mock.patch('dfdewey.datastore.postgresql.PostgresqlDataStore.query')
+  def test_get_case_images(self, mock_query):
+    """Test get case images method."""
+    index_searcher = self._get_index_searcher()
+    mock_query.return_value = [(
+        'hash1',
+        'image1.dd',
+    ), (
+        'hash2',
+        'image2.dd',
+    )]
+    index_searcher._get_case_images()
+    self.assertEqual(index_searcher.images['hash1'], 'image1.dd')
+    self.assertEqual(index_searcher.images['hash2'], 'image2.dd')
+
+  @mock.patch('dfdewey.datastore.postgresql.PostgresqlDataStore.query')
+  def test_get_filenames_from_inode(self, mock_query):
+    """Test get filenames from inode method."""
+    index_searcher = self._get_index_searcher()
+    mock_query.return_value = [('test.txt',), ('test.txt:ads',)]
+    filenames = index_searcher._get_filenames_from_inode(42, '/p1')
+    self.assertEqual(len(filenames), 2)
+    self.assertEqual(filenames[0], 'test.txt')
+    self.assertEqual(filenames[1], 'test.txt:ads')
+
+  @mock.patch('dfdewey.utils.index_searcher.IndexSearcher._get_inodes')
+  @mock.patch(
+      'dfdewey.utils.index_searcher.IndexSearcher._get_filenames_from_inode')
+  @mock.patch(
+      'dfdewey.datastore.postgresql.PostgresqlDataStore.switch_database')
+  def test_get_filenames_from_offset(
+      self, mock_switch_database, mock_get_filenames_from_inode,
+      mock_get_inodes):
+    """Test get filenames from offset method."""
+    index_searcher = self._get_index_searcher()
+    current_path = os.path.abspath(os.path.dirname(__file__))
+    image_path = os.path.join(current_path, '..', '..', 'test_data', 'test.dd')
+    # Test offset not within a file
+    filenames = index_searcher._get_filenames_from_offset(
+        image_path, TEST_IMAGE_HASH, 1048579)
+    mock_switch_database.assert_called_once_with(
+        db_name=''.join(('fs', TEST_IMAGE_HASH)))
+    self.assertIsInstance(index_searcher.scanner, FileEntryScanner)
+    mock_get_inodes.assert_called_once_with(0, '/p1')
+    self.assertEqual(filenames, [])
+
+    # Test offset within a file
+    mock_get_inodes.reset_mock()
+    mock_get_inodes.return_value = [(0,)]
+    mock_get_filenames_from_inode.return_value = ['adams.txt']
+    filenames = index_searcher._get_filenames_from_offset(
+        image_path, TEST_IMAGE_HASH, 1133936)
+    mock_get_inodes.assert_called_once_with(20, '/p1')
+    mock_get_filenames_from_inode.assert_called_once_with(67, '/p1')
+    self.assertEqual(filenames, ['adams.txt (67)'])
+
+    # Test missing image
+    index_searcher.scanner = None
+    filenames = index_searcher._get_filenames_from_offset(
+        'test.dd', TEST_IMAGE_HASH, 1048579)
+    self.assertEqual(filenames, [])
+
+    # TODO: Test volume image
+
+
+if __name__ == '__main__':
+  unittest.main()