Remove invalid doctest from bootstrap.py.

Make sure that if the test is failed, the CI will stop the build.

src/bootstrap/bootstrap.py

@@ -523,10 +523,6 @@ def program_config(self, program):
         >>> rb.config_toml = 'rustc = "rustc"\\n'
         >>> rb.program_config('rustc')
         'rustc'
-        >>> cargo_path = rb.program_config('cargo')
-        >>> cargo_path.rstrip(".exe") == os.path.join("/tmp/rust",
-        ... "bin", "cargo")
-        True
         >>> rb.config_toml = ''
         >>> cargo_path = rb.program_config('cargo')
         >>> cargo_path.rstrip(".exe") == os.path.join(rb.bin_root(),

src/bootstrap/bootstrap_test.py

@@ -15,6 +15,7 @@
 import unittest
 import tempfile
 import hashlib
+import sys
 
 from shutil import rmtree
 
@@ -110,5 +111,6 @@ def test_same_dates(self):
         TEST_LOADER.loadTestsFromTestCase(VerifyTestCase),
         TEST_LOADER.loadTestsFromTestCase(ProgramOutOfDate)])
 
-    RUNNER = unittest.TextTestRunner(verbosity=2)
-    RUNNER.run(SUITE)
+    RUNNER = unittest.TextTestRunner(stream=sys.stdout, verbosity=2)
+    result = RUNNER.run(SUITE)
+    sys.exit(0 if result.wasSuccessful() else 1)