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diff --git a/src/ext/tinytest.h b/src/ext/tinytest.h
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+/* tinytest.h -- Copyright 2009-2012 Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TINYTEST_H_INCLUDED_
+#define TINYTEST_H_INCLUDED_
+
+/** Flag for a test that needs to run in a subprocess. */
+#define TT_FORK  (1<<0)
+/** Runtime flag for a test we've decided to skip. */
+#define TT_SKIP  (1<<1)
+/** Internal runtime flag for a test we've decided to run. */
+#define TT_ENABLED_  (1<<2)
+/** If you add your own flags, make them start at this point. */
+#define TT_FIRST_USER_FLAG (1<<3)
+
+typedef void (*testcase_fn)(void *);
+
+struct testcase_t;
+
+/** Functions to initialize/teardown a structure for a testcase. */
+struct testcase_setup_t {
+	/** Return a new structure for use by a given testcase. */
+	void *(*setup_fn)(const struct testcase_t *);
+	/** Clean/free a structure from setup_fn. Return 1 if ok, 0 on err. */
+	int (*cleanup_fn)(const struct testcase_t *, void *);
+};
+
+/** A single test-case that you can run. */
+struct testcase_t {
+	const char *name; /**< An identifier for this case. */
+	testcase_fn fn; /**< The function to run to implement this case. */
+	unsigned long flags; /**< Bitfield of TT_* flags. */
+	const struct testcase_setup_t *setup; /**< Optional setup/cleanup fns*/
+	void *setup_data; /**< Extra data usable by setup function */
+};
+#define END_OF_TESTCASES { NULL, NULL, 0, NULL, NULL }
+
+/** A group of tests that are selectable together. */
+struct testgroup_t {
+	const char *prefix; /**< Prefix to prepend to testnames. */
+	struct testcase_t *cases; /** Array, ending with END_OF_TESTCASES */
+};
+#define END_OF_GROUPS { NULL, NULL}
+
+/** Implementation: called from a test to indicate failure, before logging. */
+void tinytest_set_test_failed_(void);
+/** Implementation: called from a test to indicate that we're skipping. */
+void tinytest_set_test_skipped_(void);
+/** Implementation: return 0 for quiet, 1 for normal, 2 for loud. */
+int tinytest_get_verbosity_(void);
+/** Implementation: Set a flag on tests matching a name; returns number
+ * of tests that matched. */
+int tinytest_set_flag_(struct testgroup_t *, const char *, unsigned long);
+
+/** Set all tests in 'groups' matching the name 'named' to be skipped. */
+#define tinytest_skip(groups, named) \
+	tinytest_set_flag_(groups, named, TT_SKIP)
+
+/** Run a single testcase in a single group. */
+int testcase_run_one(const struct testgroup_t *,const struct testcase_t *);
+/** Run a set of testcases from an END_OF_GROUPS-terminated array of groups,
+    as selected from the command line. */
+int tinytest_main(int argc, const char **argv, struct testgroup_t *groups);
+
+#endif