Use lowercase true/false in assertTrue/assertFalse messages.
diff --git a/Lib/unittest/case.py b/Lib/unittest/case.py
index 6752e7a..d6e80e8 100644
--- a/Lib/unittest/case.py
+++ b/Lib/unittest/case.py
@@ -477,15 +477,15 @@
         raise self.failureException(msg)
 
     def assertFalse(self, expr, msg=None):
-        "Fail the test if the expression is true."
+        """Check that the expression is false."""
         if expr:
-            msg = self._formatMessage(msg, "%s is not False" % safe_repr(expr))
+            msg = self._formatMessage(msg, "%s is not false" % safe_repr(expr))
             raise self.failureException(msg)
 
     def assertTrue(self, expr, msg=None):
-        """Fail the test unless the expression is true."""
+        """Check that the expression is true."""
         if not expr:
-            msg = self._formatMessage(msg, "%s is not True" % safe_repr(expr))
+            msg = self._formatMessage(msg, "%s is not true" % safe_repr(expr))
             raise self.failureException(msg)
 
     def _formatMessage(self, msg, standardMsg):