Add failing test.

t/pt-upgrade/samples/007/null.log

@@ -0,0 +1,4 @@
+# User@Host: root[root] @ localhost []
+# Query_time: 1  Lock_time: 0  Rows_sent: 7  Rows_examined: 7
+use test;
+select * from test.t order by id;

t/pt-upgrade/samples/007/null.txt

@@ -0,0 +1,35 @@
+
+#-----------------------------------------------------------------------
+# Logs
+#-----------------------------------------------------------------------
+
+File: ...
+Size: 145
+
+#-----------------------------------------------------------------------
+# Hosts
+#-----------------------------------------------------------------------
+
+host1:
+
+  DSN:       h=127.1,P=12345
+  hostname:  ...
+  MySQL:     ...
+
+host2:
+
+  DSN:       h=127.1,P=12348
+  hostname:  ...
+  MySQL:     ...
+
+#-----------------------------------------------------------------------
+# Stats
+#-----------------------------------------------------------------------
+
+failed_queries        0
+not_select            0
+queries_filtered      0
+queries_no_diffs      1
+queries_read          1
+queries_with_diffs    0
+queries_with_errors   0

t/pt-upgrade/samples/007/null_results.txt

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+
+#-----------------------------------------------------------------------
+# Logs
+#-----------------------------------------------------------------------
+
+Results directory: ...
+
+#-----------------------------------------------------------------------
+# Hosts
+#-----------------------------------------------------------------------
+
+host1:
+
+  Reading results from ...
+
+host2:
+
+  DSN:       h=127.1,P=12348
+  hostname:  ...
+  MySQL:     ...
+
+#-----------------------------------------------------------------------
+# Stats
+#-----------------------------------------------------------------------
+
+failed_queries        0
+not_select            0
+queries_filtered      0
+queries_no_diffs      1
+queries_read          1
+queries_with_diffs    0
+queries_with_errors   0

t/pt-upgrade/samples/007/null_results/query

@@ -0,0 +1,3 @@
+use `test`;
+select * from test.t order by id
+##

t/pt-upgrade/samples/007/null_results/results

@@ -0,0 +1,6 @@
+$results = {
+  query_time => '0',
+  warnings => {}
+};
+
+##

t/pt-upgrade/samples/007/null_results/rows

@@ -0,0 +1,34 @@
+$rows = [
+  [
+    '1',
+    'a',
+    '2013-01-01 00:00:01'
+  ],
+  [
+    '2',
+    'b',
+    '2013-01-01 00:00:02'
+  ],
+  [
+    '3',
+    'c',
+    '2013-01-01 00:00:03'
+  ],
+  [
+    '4',
+    'd',
+    '2013-01-01 00:00:04'
+  ],
+  [
+    '5',
+    'e',
+    '2013-01-01 00:00:05'
+  ],
+  [
+    '6',
+    'f',
+    '2013-01-01 00:00:06'
+  ]
+];
+
+##

t/pt-upgrade/samples/007/tables.sql

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+DROP DATABASE IF EXISTS test;
+CREATE DATABASE test;
+USE test;
+CREATE TABLE t (
+  id         int(10) NOT NULL AUTO_INCREMENT,
+  username   varchar(8) default NULL,
+  PRIMARY KEY  (`id`)
+);
+INSERT INTO t VALUES
+  (null,   'a'),
+  (null,  null);