Update the R= line with the actual list of reviewers that approved the CL.

tests/gcl_unittest.py

Index: tests/gcl_unittest.py
diff --git a/tests/gcl_unittest.py b/tests/gcl_unittest.py
index ccba856a11a04f34edab145833eabc2ce405f3a5..8f7217898886edfcab3178c7022bfceaed2d82d1 100755
--- a/tests/gcl_unittest.py
+++ b/tests/gcl_unittest.py
@@ -193,14 +193,14 @@ class ChangeInfoUnittest(GclTestsBase):
     members = [
       'AddComment', 'CloseIssue', 'Delete', 'Exists', 'GetFiles',
       'GetFileNames', 'GetLocalRoot',
-      'Load',
+      'GetIssueReviewers', 'Load',
       'MissingTests', 'NeedsUpload', 'PrimeLint', 'RpcServer', 'Save',
       'SendToRietveld',
       'SEPARATOR',
       'UpdateDescriptionFromIssue', 'UpdateRietveldDescription',
       'append_line',
       'description', 'force_description', 'get_reviewers', 'issue', 'name',
-      'needs_upload', 'patch', 'patchset', 'rietveld',
+      'needs_upload', 'patch', 'patchset', 'rietveld', 'update_reviewers',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(
@@ -577,6 +577,8 @@ class CMDCommitUnittest(GclTestsBase):
     self.mockCommit(
         change_info, 'deescription\n\nReview URL: https://my_server/1', '')
     change_info.UpdateDescriptionFromIssue()
+    change_info.GetIssueReviewers().AndReturn(['a@c'])
+    change_info.update_reviewers('a@c')
     self.mox.ReplayAll()
 
     retval = gcl.CMDcommit(['naame'])
@@ -595,6 +597,8 @@ class CMDCommitUnittest(GclTestsBase):
         'deescription\n\nReview URL: https://my_server/1',
         '\nCommitted revision 12345')
     change_info.UpdateDescriptionFromIssue()
+    change_info.GetIssueReviewers().AndReturn(['a@c'])
+    change_info.update_reviewers('a@c')
     change_info.append_line('Committed: http://view/12345')
     self.mox.ReplayAll()