Smoother concurrent test-flow

[dbsrgits/DBIx-Class.git] / t / lib / DBICTest.pm

diff --git a/t/lib/DBICTest.pm b/t/lib/DBICTest.pm
index f95c8e7..a185763 100644 (file)
--- a/t/lib/DBICTest.pm
+++ b/t/lib/DBICTest.pm
@@ -3,6 +3,21 @@ package # hide from PAUSE
 
 use strict;
 use warnings;
+
+# this noop trick initializes the STDOUT, so that the TAP::Harness
+# issued IO::Select->can_read calls (which are blocking wtf wtf wtf)
+# keep spinning and scheduling jobs
+# This results in an overall much smoother job-queue drainage, since
+# the Harness blocks less
+# (ideally this needs to be addressed in T::H, but a quick patchjob
+# broke everything so tabling it for now)
+BEGIN {
+  if ($INC{'Test/Builder.pm'}) {
+    local $| = 1;
+    print "#\n";
+  }
+}
+
 use DBICTest::RunMode;
 use DBICTest::Schema;
 use DBICTest::Util::LeakTracer qw/populate_weakregistry assert_empty_weakregistry/;
@@ -187,8 +202,14 @@ sub _database {
         # no fsync on commit
         $dbh->do ('PRAGMA synchronous = OFF');
 
-        $dbh->do ('PRAGMA reverse_unordered_selects = ON')
-          if $ENV{DBICTEST_SQLITE_REVERSE_DEFAULT_ORDER};
+        if ($ENV{DBICTEST_SQLITE_REVERSE_DEFAULT_ORDER}) {
+
+          $storage->throw_exception(
+            'PRAGMA reverse_unordered_selects does not work correctly before libsqlite 3.7.9'
+          ) if $storage->_server_info->{normalized_dbms_version} < 3.007009;
+
+          $dbh->do ('PRAGMA reverse_unordered_selects = ON');
+        }
 
         # set a *DBI* disconnect callback, to make sure the physical SQLite
         # file is still there (i.e. the test does not attempt to delete