binman: Update testPackExtra with more checks

Check the contents of each section to make sure it is actually in the
right place.

Also fix a whitespace error in the .dts file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index 4f7e226..481b8fd 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -785,9 +785,8 @@
 
     def testPackExtra(self):
         """Test that extra packing feature works as expected"""
-        retcode = self._DoTestFile('009_pack_extra.dts')
+        data = self._DoReadFile('009_pack_extra.dts')
 
-        self.assertEqual(0, retcode)
         self.assertIn('image', control.images)
         image = control.images['image']
         entries = image.GetEntries()
@@ -799,30 +798,48 @@
         self.assertEqual(0, entry.offset)
         self.assertEqual(3, entry.pad_before)
         self.assertEqual(3 + 5 + len(U_BOOT_DATA), entry.size)
+        self.assertEqual(U_BOOT_DATA, entry.data)
+        self.assertEqual(tools.GetBytes(0, 3) + U_BOOT_DATA +
+                         tools.GetBytes(0, 5), data[:entry.size])
+        pos = entry.size
 
         # Second u-boot has an aligned size, but it has no effect
         self.assertIn('u-boot-align-size-nop', entries)
         entry = entries['u-boot-align-size-nop']
-        self.assertEqual(12, entry.offset)
-        self.assertEqual(4, entry.size)
+        self.assertEqual(pos, entry.offset)
+        self.assertEqual(len(U_BOOT_DATA), entry.size)
+        self.assertEqual(U_BOOT_DATA, entry.data)
+        self.assertEqual(U_BOOT_DATA, data[pos:pos + entry.size])
+        pos += entry.size
 
         # Third u-boot has an aligned size too
         self.assertIn('u-boot-align-size', entries)
         entry = entries['u-boot-align-size']
-        self.assertEqual(16, entry.offset)
+        self.assertEqual(pos, entry.offset)
         self.assertEqual(32, entry.size)
+        self.assertEqual(U_BOOT_DATA, entry.data)
+        self.assertEqual(U_BOOT_DATA + tools.GetBytes(0, 32 - len(U_BOOT_DATA)),
+                         data[pos:pos + entry.size])
+        pos += entry.size
 
         # Fourth u-boot has an aligned end
         self.assertIn('u-boot-align-end', entries)
         entry = entries['u-boot-align-end']
         self.assertEqual(48, entry.offset)
         self.assertEqual(16, entry.size)
+        self.assertEqual(U_BOOT_DATA, entry.data[:len(U_BOOT_DATA)])
+        self.assertEqual(U_BOOT_DATA + tools.GetBytes(0, 16 - len(U_BOOT_DATA)),
+                         data[pos:pos + entry.size])
+        pos += entry.size
 
         # Fifth u-boot immediately afterwards
         self.assertIn('u-boot-align-both', entries)
         entry = entries['u-boot-align-both']
         self.assertEqual(64, entry.offset)
         self.assertEqual(64, entry.size)
+        self.assertEqual(U_BOOT_DATA, entry.data[:len(U_BOOT_DATA)])
+        self.assertEqual(U_BOOT_DATA + tools.GetBytes(0, 64 - len(U_BOOT_DATA)),
+                         data[pos:pos + entry.size])
 
         self.CheckNoGaps(entries)
         self.assertEqual(128, image.size)