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diff --git a/src/test/methods.h b/src/test/methods.h
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+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library 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 of the License, or
+ * (at your option) any later version.
+ * 
+ * This library 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 this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBGAMMA_TEST_METHODS_H
+#define LIBGAMMA_TEST_METHODS_H
+
+
+/**
+ * Get the name representation of an
+ * adjustment method by its identifier.
+ * 
+ * @param   method  The identifier of the adjustment method.
+ * @return          The name of the adjustment method, should not be `free`:d.
+ */
+const char* method_name(int method) __attribute__((const));
+
+/**
+ * Print a list of adjustment methods.
+ * 
+ * @param  description  Precursory text for the list.
+ * @param  methods      An array allocated to fit all adjustment methods.
+ * @param  operation    See the `operation` parameter for `libgamma_list_methods`.
+ */
+void list_methods(const char* description, int* methods, int operation);
+
+/**
+ * Print all lists, of adjustments methods, that
+ * are made available by `libgamma_list_methods`.
+ */
+void list_methods_lists(void);
+
+/**
+ * Test the availability (determined
+ * at compile-time) of all adjustment
+ * methods and one that does not exist.
+ */
+void method_availability(void);
+
+/**
+ * List the default site and the environment
+ * variable, if any, that determines the
+ * default site, for all availiable adjustment
+ * methods.
+ */
+void list_default_sites(void);
+
+/**
+ * Print the capabilities of all availiable
+ * adjustment methods.
+ */
+void method_capabilities(void);
+
+
+#endif
+