WL#3206 (Adding unit tests):

Added 'test' target to build and run tests. Added documentation.
Added README.txt files. Fixing problem with initialization of
the Test::Harness::Straps replacement. Added code to filter out non-
test directories.


unittest/Makefile.am:
  Adding 'test' target to build and run tests.
unittest/examples/skip.t.c:
  Changing text for skip reason.
unittest/examples/skip_all.t.c:
  Changing text for skip reason.
unittest/mytap/tap.c:
  Adding copyright. Adding documentation. Minor code changes.
unittest/mytap/tap.h:
  Adding copyright. Adding documentation.
unittest/unit.pl:
  Initializing replacement Test::Harness::Straps properly.
  Adding code to filter non-test directories from default directories
  to use.
unittest/README.txt:
  New BitKeeper file ``unittest/README.txt''

unittest/unit.pl

@@ -3,15 +3,22 @@
 # Override _command_line in the standard Perl test harness to prevent
 # it from using "perl" to run the test scripts.
 package MySQL::Straps;
+
 use base qw(Test::Harness::Straps);
-sub _command_line { return $_[1] }
+
+use strict;
+
+sub _command_line {
+  return $_[1]
+}
 
 package main;
 
-use strict;
-use Test::Harness;
+use Test::Harness qw(&runtests $verbose);
 use File::Find;
 
+use strict;
+
 sub run_cmd (@);
 
 my %dispatch = (
@@ -30,6 +37,9 @@ unit - Run unit tests in directory
 
 my $cmd = shift;
 
+# $Test::Harness::Verbose = 1;
+# $Test::Harness::Debug = 1;
+
 if (defined $cmd && exists $dispatch{$cmd}) {
     $dispatch{$cmd}->(@ARGV);
 } else {
@@ -57,20 +67,41 @@ sub _find_test_files (@) {
 sub run_cmd (@) {
     my @files;
 
-    push(@_, '.') if @_ == 0;
+    # If no directories were supplied, we add all directories in the
+    # current directory except 'mytap' since it is not part of the
+    # test suite.
+    if (@_ == 0) {
+      # Ignore these directories
+      my @ignore = qw(mytap SCCS);
+
+      # Build an expression from the directories above that tests if a
+      # directory should be included in the list or not.
+      my $ignore = join(' && ', map { '$_ ne ' . "'$_'"} @ignore);
+
+      # Open and read the directory. Filter out all files, hidden
+      # directories, and directories named above.
+      opendir(DIR, ".") or die "Cannot open '.': $!\n";
+      @_ = grep { -d $_ && $_ !~ /^\..*/ && eval $ignore } readdir(DIR);
+      closedir(DIR);
+    }
+
+    print "Running tests: @_\n";
 
     foreach my $name (@_) {
         push(@files, _find_test_files $name) if -d $name;
         push(@files, $name) if -f $name;
     }
-    
+
     if (@files > 0) {
         # Removing the first './' from the file names
         foreach (@files) { s!^\./!! }
-        
-        # Install the strap above instead of the default strap
+
+        # Install the strap above instead of the default strap.  Since
+        # we are replacing the straps under the feet of Test::Harness,
+        # we need to do some basic initializations in the new straps.
         $Test::Harness::Strap = MySQL::Straps->new;
-        
+        $Test::Harness::Strap->{callback} = \&Test::Harness::strap_callback;
+
         runtests @files;
     }
 }