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diff --git a/src/plugins/test_lib.h b/src/plugins/test_lib.h
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+++ b/src/plugins/test_lib.h
@@ -0,0 +1,100 @@
+/*
+     This file is part of libextractor.
+     (C) 2012 Vidyut Samanta and Christian Grothoff
+
+     libextractor is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     libextractor is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with libextractor; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+/**
+ * @file plugins/test_lib.h
+ * @brief helper library for writing testcases
+ * @author Christian Grothoff
+ */
+#ifndef TEST_LIB_H
+#define TEST_LIB_H
+
+#include "extractor.h"
+
+/**
+ * Expected outcome from the plugin.
+ */
+struct SolutionData
+{
+  /**
+   * Expected type.
+   */
+  enum EXTRACTOR_MetaType type;
+
+  /**
+   * Expected format.
+   */
+  enum EXTRACTOR_MetaFormat format;
+
+  /**
+   * Expected data mime type.
+   */
+  const char *data_mime_type;
+
+  /**
+   * Expected meta data.
+   */
+  const char *data;
+
+  /**
+   * Expected number of bytes in meta data.
+   */
+  size_t data_len;
+
+  /**
+   * Internally used flag to say if this solution was
+   * provided by the plugin; 0 for no, 1 for yes; -1 to
+   * terminate the list.
+   */
+  int solved;
+};
+
+
+/**
+ * Set of problems 
+ */
+struct ProblemSet
+{
+  /**
+   * File to run the extractor on, NULL
+   * to terminate the array.
+   */
+  const char *filename;
+
+  /**
+   * Expected meta data.  Terminate array with -1 in 'solved'.
+   */
+  struct SolutionData *solution;
+
+};
+
+
+/**
+ * Main function to be called to test a plugin.
+ *
+ * @param plugin_name name of the plugin to load
+ * @param ps array of problems the plugin should solve;
+ *        NULL in filename terminates the array. 
+ * @return 0 on success, 1 on failure
+ */
+int 
+ET_main (const char *plugin_name,
+         struct ProblemSet *ps);
+
+#endif