binman: Add test for u-boot-spl-bss-pad

Add a test that we can pad the BSS with zero bytes.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index 539ebc5..4e6aaad 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -88,6 +88,10 @@
         with open(self.TestFile('descriptor.bin')) as fd:
             TestFunctional._MakeInputFile('descriptor.bin', fd.read())
 
+        # ELF file with a '__bss_size' symbol
+        with open(self.TestFile('bss_data')) as fd:
+            TestFunctional._MakeInputFile('spl/u-boot-spl', fd.read())
+
     @classmethod
     def tearDownClass(self):
         """Remove the temporary input directory and its contents"""
@@ -814,6 +818,11 @@
         data = self._DoReadFile('46_intel-vbt.dts')
         self.assertEqual(VBT_DATA, data[:len(VBT_DATA)])
 
+    def testSplBssPad(self):
+        """Test that we can pad SPL's BSS with zeros"""
+        data = self._DoReadFile('47_spl_bss_pad.dts')
+        self.assertEqual(U_BOOT_SPL_DATA + (chr(0) * 10) + U_BOOT_DATA, data)
+
 
 if __name__ == "__main__":
     unittest.main()