binman: Support getting test-coverage on just one test

Pass the arguments through to test_util so that a single test can be
used.

Update the docs and add some missing backquotes in the same section.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/binman.rst

@@ -2099,12 +2099,15 @@ Code coverage
 -------------
 
 Binman is a critical tool and is designed to be very testable. Entry
-implementations target 100% test coverage. Run 'binman test -T' to check this.
+implementations target 100% test coverage. Run ``binman test -T`` to check this.
 
 To enable Python test coverage on Debian-type distributions (e.g. Ubuntu)::
 
    $ sudo apt-get install python-coverage python3-coverage python-pytest
 
+You can also check the coverage provided by a single test, e.g.::
+
+   binman test -T testSimple
 
 Exit status
 -----------

tools/binman/main.py

@@ -85,7 +85,7 @@ def RunTests(debug, verbosity, processes, test_preserve_dirs, args, toolpath):
 
     return (0 if result.wasSuccessful() else 1)
 
-def RunTestCoverage(toolpath, build_dir):
+def RunTestCoverage(toolpath, build_dir, args):
     """Run the tests and check that we get 100% coverage"""
     glob_list = control.GetEntryModules(False)
     all_set = set([os.path.splitext(os.path.basename(item))[0]
@@ -97,7 +97,7 @@ def RunTestCoverage(toolpath, build_dir):
     test_util.run_test_coverage('tools/binman/binman', None,
             ['*test*', '*main.py', 'tools/patman/*', 'tools/dtoc/*',
              'tools/u_boot_pylib/*'],
-            build_dir, all_set, extra_args or None)
+            build_dir, all_set, extra_args or None, args=args)
 
 def RunBinman(args):
     """Main entry point to binman once arguments are parsed
@@ -117,7 +117,7 @@ def RunBinman(args):
 
     if args.cmd == 'test':
         if args.test_coverage:
-            RunTestCoverage(args.toolpath, args.build_dir)
+            RunTestCoverage(args.toolpath, args.build_dir, args.tests)
         else:
             ret_code = RunTests(args.debug, args.verbosity, args.processes,
                                 args.test_preserve_dirs, args.tests,