Fixed -f and last_mtime in general. We need better tests.

[git-p4: depot-paths = "//src/ZenTest/dev/": change = 3820]

lib/autotest.rb

@@ -234,7 +234,10 @@ def get_to_green
   def run_tests
     hook :run_command
 
-    self.find_files_to_test
+    new_mtime = self.find_files_to_test
+    return unless new_mtime
+    self.last_mtime = new_mtime
+
     cmd = self.make_test_cmd self.files_to_test
 
     puts cmd unless $q
@@ -377,8 +380,11 @@ def find_files_to_test(files=find_files)
       self.files_to_test[filename] # creates key with default value
     end
 
-    self.last_mtime = files.values.max
-    not updated.empty?
+    if updated.empty? then
+      nil
+    else
+      files.values.max
+    end
   end
 
   ##

lib/zentest.rb

@@ -56,7 +56,7 @@ def zentest
 
 class ZenTest
 
-  VERSION = '3.9.1'
+  VERSION = '3.9.2'
 
   include ZenTestMapping
 

test/test_autotest.rb

@@ -404,8 +404,8 @@ def util_exceptions
   end
 
   def util_find_files_to_test(f, expected)
-    t = @a.last_mtime + 1
-    files = { f => t }
+    t = @a.last_mtime
+    files = { f => t + 1 }
 
     assert @a.find_files_to_test(files)
     assert_equal expected, @a.files_to_test