patman: add test for SPDX license

Add a test to exercise the check for a valid SPDX license.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/patman/test.py

@@ -148,7 +148,7 @@ index 0000000..2234c87
 --- /dev/null
 +++ b/common/bootstage.c
 @@ -0,0 +1,37 @@
-+// SPDX-License-Identifier: GPL-2.0+
++%s
 +/*
 + * Copyright (c) 2011, Google Inc. All rights reserved.
 + *
@@ -189,19 +189,22 @@ index 0000000..2234c87
 1.7.3.1
 '''
         signoff = 'Signed-off-by: Simon Glass <sjg@chromium.org>\n'
+        license = '// SPDX-License-Identifier: GPL-2.0+'
         tab = '	'
         indent = '    '
         if data_type == 'good':
             pass
         elif data_type == 'no-signoff':
             signoff = ''
+        elif data_type == 'no-license':
+            license = ''
         elif data_type == 'spaces':
             tab = '   '
         elif data_type == 'indent':
             indent = tab
         else:
             print('not implemented')
-        return data % (signoff, tab, indent, tab)
+        return data % (signoff, license, tab, indent, tab)
 
     def SetupData(self, data_type):
         inhandle, inname = tempfile.mkstemp()
@@ -234,6 +237,17 @@ index 0000000..2234c87
         self.assertEqual(result.lines, 62)
         os.remove(inf)
 
+    def testNoLicense(self):
+        inf = self.SetupData('no-license')
+        result = checkpatch.CheckPatch(inf)
+        self.assertEqual(result.ok, False)
+        self.assertEqual(len(result.problems), 1)
+        self.assertEqual(result.errors, 0)
+        self.assertEqual(result.warnings, 1)
+        self.assertEqual(result.checks, 0)
+        self.assertEqual(result.lines, 62)
+        os.remove(inf)
+
     def testSpaces(self):
         inf = self.SetupData('spaces')
         result = checkpatch.CheckPatch(inf)