diff --git a/tools/binman/elf_test.py b/tools/binman/elf_test.py
index dca7bc5..e5fc282 100644
--- a/tools/binman/elf_test.py
+++ b/tools/binman/elf_test.py
@@ -6,21 +6,60 @@
 #
 # Test for the elf module
 
+from contextlib import contextmanager
 import os
 import sys
 import unittest
 
+try:
+  from StringIO import StringIO
+except ImportError:
+  from io import StringIO
+
 import elf
 
 binman_dir = os.path.dirname(os.path.realpath(sys.argv[0]))
-fname = os.path.join(binman_dir, 'test', 'u_boot_ucode_ptr')
+
+# Use this to suppress stdout/stderr output:
+# with capture_sys_output() as (stdout, stderr)
+#   ...do something...
+@contextmanager
+def capture_sys_output():
+  capture_out, capture_err = StringIO(), StringIO()
+  old_out, old_err = sys.stdout, sys.stderr
+  try:
+    sys.stdout, sys.stderr = capture_out, capture_err
+    yield capture_out, capture_err
+  finally:
+    sys.stdout, sys.stderr = old_out, old_err
+
+
+class FakeEntry:
+    def __init__(self, contents_size):
+        self.contents_size = contents_size
+        self.data = 'a' * contents_size
+
+    def GetPath(self):
+        return 'entry_path'
+
+class FakeImage:
+    def __init__(self, sym_value=1):
+        self.sym_value = sym_value
+
+    def GetPath(self):
+        return 'image_path'
+
+    def LookupSymbol(self, name, weak, msg):
+        return self.sym_value
 
 class TestElf(unittest.TestCase):
     def testAllSymbols(self):
+        fname = os.path.join(binman_dir, 'test', 'u_boot_ucode_ptr')
         syms = elf.GetSymbols(fname, [])
         self.assertIn('.ucode', syms)
 
     def testRegexSymbols(self):
+        fname = os.path.join(binman_dir, 'test', 'u_boot_ucode_ptr')
         syms = elf.GetSymbols(fname, ['ucode'])
         self.assertIn('.ucode', syms)
         syms = elf.GetSymbols(fname, ['missing'])
@@ -28,5 +67,56 @@
         syms = elf.GetSymbols(fname, ['missing', 'ucode'])
         self.assertIn('.ucode', syms)
 
+    def testMissingFile(self):
+        entry = FakeEntry(10)
+        image = FakeImage()
+        with self.assertRaises(ValueError) as e:
+            syms = elf.LookupAndWriteSymbols('missing-file', entry, image)
+        self.assertIn("Filename 'missing-file' not found in input path",
+                      str(e.exception))
+
+    def testOutsideFile(self):
+        entry = FakeEntry(10)
+        image = FakeImage()
+        elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
+        with self.assertRaises(ValueError) as e:
+            syms = elf.LookupAndWriteSymbols(elf_fname, entry, image)
+        self.assertIn('entry_path has offset 4 (size 8) but the contents size '
+                      'is a', str(e.exception))
+
+    def testMissingImageStart(self):
+        entry = FakeEntry(10)
+        image = FakeImage()
+        elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms_bad')
+        self.assertEqual(elf.LookupAndWriteSymbols(elf_fname, entry, image),
+                         None)
+
+    def testBadSymbolSize(self):
+        entry = FakeEntry(10)
+        image = FakeImage()
+        elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms_size')
+        with self.assertRaises(ValueError) as e:
+            syms = elf.LookupAndWriteSymbols(elf_fname, entry, image)
+        self.assertIn('has size 1: only 4 and 8 are supported',
+                      str(e.exception))
+
+    def testNoValue(self):
+        entry = FakeEntry(20)
+        image = FakeImage(sym_value=None)
+        elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
+        syms = elf.LookupAndWriteSymbols(elf_fname, entry, image)
+        self.assertEqual(chr(255) * 16 + 'a' * 4, entry.data)
+
+    def testDebug(self):
+        elf.debug = True
+        entry = FakeEntry(20)
+        image = FakeImage()
+        elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
+        with capture_sys_output() as (stdout, stderr):
+            syms = elf.LookupAndWriteSymbols(elf_fname, entry, image)
+        elf.debug = False
+        self.assertTrue(len(stdout.getvalue()) > 0)
+
+
 if __name__ == '__main__':
     unittest.main()