Adding upstream version 0.30.0.upstream/0.30.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 1782 insertions, 0 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
new file mode 100644
index 0000000..4c9c5f6
--- /dev/null
+++ b/test/Makefile.am
@@ -0,0 +1,16 @@
+AM_CPPFLAGS = $(XORG_CFLAGS) \
+	      $(CWARNFLAGS) \
+	      -I$(top_srcdir)/include \
+	      -I$(top_srcdir)/src
+
+tests = test-draglock test-bezier
+
+noinst_PROGRAMS = $(tests)
+
+test_draglock_SOURCES = test-draglock.c
+test_draglock_LDADD = ../src/libdraglock.la
+
+test_bezier_SOURCES = test-bezier.c
+test_bezier_LDADD = ../src/libbezier.la -lm
+
+TESTS = $(tests)
diff --git a/test/Makefile.in b/test/Makefile.in
new file mode 100644
index 0000000..30b148e
--- /dev/null
+++ b/test/Makefile.in
@@ -0,0 +1,1020 @@
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+	      $(CWARNFLAGS) \
+	      -I$(top_srcdir)/include \
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+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
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+	@rm -f test-bezier$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(test_bezier_OBJECTS) $(test_bezier_LDADD) $(LIBS)
+
+test-draglock$(EXEEXT): $(test_draglock_OBJECTS) $(test_draglock_DEPENDENCIES) $(EXTRA_test_draglock_DEPENDENCIES) 
+	@rm -f test-draglock$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(test_draglock_OBJECTS) $(test_draglock_LDADD) $(LIBS)
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+# Recover from deleted '.trs' file; this should ensure that
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+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am clean clean-generic clean-libtool \
+	clean-noinstPROGRAMS cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am recheck tags tags-am uninstall \
+	uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/test-bezier.c b/test/test-bezier.c
new file mode 100644
index 0000000..9a6e59e
--- /dev/null
+++ b/test/test-bezier.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright © 2016 Red Hat, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of Red Hat
+ * not be used in advertising or publicity pertaining to distribution
+ * of the software without specific, written prior permission.  Red
+ * Hat makes no representations about the suitability of this software
+ * for any purpose.  It is provided "as is" without express or implied
+ * warranty.
+ *
+ * THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
+ * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "bezier.h"
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+static inline void
+print_curve(int *bezier, size_t size)
+{
+	/* look at it with gnuplot, "plot 'output-file.txt'" */
+	for (int i = 0; i < size; i++)
+		printf("%d %d\n", i, bezier[i]);
+}
+
+static void
+test_linear(void)
+{
+	const int size = 2048;
+	int bezier[size];
+
+	struct bezier_control_point controls[] = {
+		{ 0.0, 0.0 },
+		{ 0.0, 0.0 },
+		{ 1.0, 1.0 },
+		{ 1.0, 1.0 }
+	};
+
+	cubic_bezier(controls, bezier, size);
+
+	assert(bezier[0] == 0);
+	assert(bezier[size - 1] == size - 1);
+
+	for (int x = 1; x < size; x++)
+		assert(bezier[x] == x);
+}
+
+/* Center point pulled down towards X axis */
+static void
+test_flattened(void)
+{
+	const int size = 2048;
+	int bezier[size];
+
+	struct bezier_control_point controls[] = {
+		{ 0.0, 0.0 },
+		{ 0.1, 0.0 },
+		{ 1.0, 0.9 },
+		{ 1.0, 1.0 }
+	};
+
+	cubic_bezier(controls, bezier, size);
+
+	assert(bezier[0] == 0);
+	assert(bezier[size - 1] == size - 1);
+
+	for (int x = 1; x < size - 1; x++) {
+		assert(bezier[x] < x);
+	}
+}
+
+/* Center point pulled up from X axis */
+static void
+test_raised(void)
+{
+	const int size = 2048;
+	int bezier[size];
+
+	struct bezier_control_point controls[] = {
+		{ 0.0, 0.0 },
+		{ 0.1, 0.4 },
+		{ 0.4, 1.0 },
+		{ 1.0, 1.0 }
+	};
+
+	cubic_bezier(controls, bezier, size);
+
+	assert(bezier[0] == 0);
+	assert(bezier[size - 1] == size - 1);
+
+	for (int x = 1; x < size; x++)
+		assert(bezier[x] >= x);
+
+	for (int x = 10; x < size - 10; x++)
+		assert(bezier[x] > x);
+}
+
+static void
+test_windy(void)
+{
+	const int size = 2048;
+	int bezier[size];
+
+	struct bezier_control_point controls[] = {
+		{ 0.0, 0.0 },
+		{ 0.0, 0.3 },
+		{ 1.0, 0.7 },
+		{ 1.0, 1.0 }
+	};
+
+	cubic_bezier(controls, bezier, size);
+
+	assert(bezier[0] == 0);
+	assert(bezier[size - 1] == size - 1);
+
+	for (int x = 1; x < size/2 - 20; x++)
+		assert(bezier[x] > x);
+
+	for (int x = size/2 + 20; x < size - 1; x++)
+		assert(bezier[x] < x);
+}
+
+static void
+test_nonzero_x_linear(void)
+{
+	const int size = 2048;
+	int bezier[size];
+	int x;
+
+	struct bezier_control_point controls[] = {
+		{ 0.2, 0.0 },
+		{ 0.2, 0.0 },
+		{ 0.8, 1.0 },
+		{ 0.8, 1.0 }
+	};
+
+	cubic_bezier(controls, bezier, size);
+
+	x = 0;
+	do {
+		assert(bezier[x] == 0);
+	} while (++x < size * 0.2 - 1);
+
+	/* ppc64le, ppc64, aarch64 have different math results at -O2,
+	   resulting in one extra zero at the beginning of the array.
+	   some other numbers are different too but within the error
+	   margin (#99992) */
+	if (bezier[x] == 0)
+		x++;
+
+	do {
+		assert(bezier[x] > bezier[x-1]);
+	} while (++x < size * 0.8 - 1);
+
+	do {
+		assert(bezier[x] == size - 1);
+	} while (++x < size);
+}
+
+static void
+test_nonzero_y_linear(void)
+{
+	const int size = 2048;
+	int bezier[size];
+
+	struct bezier_control_point controls[] = {
+		{ 0.0, 0.2 },
+		{ 0.0, 0.2 },
+		{ 1.0, 0.8 },
+		{ 1.0, 0.8 }
+	};
+
+	cubic_bezier(controls, bezier, size);
+
+	assert(bezier[0] == (int)(size * 0.2));
+
+	for (int x = 1; x < size; x++) {
+		assert(bezier[x - 1] <= bezier[x]);
+		assert(bezier[x] >= (int)(size * 0.2));
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	test_linear();
+	test_flattened();
+	test_raised();
+	test_windy();
+	test_nonzero_x_linear();
+	test_nonzero_y_linear();
+
+	return 0;
+}
diff --git a/test/test-draglock.c b/test/test-draglock.c
new file mode 100644
index 0000000..96ef5bb
--- /dev/null
+++ b/test/test-draglock.c
@@ -0,0 +1,540 @@
+/*
+ * Copyright © 2013-2015 Red Hat, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of Red Hat
+ * not be used in advertising or publicity pertaining to distribution
+ * of the software without specific, written prior permission.  Red
+ * Hat makes no representations about the suitability of this software
+ * for any purpose.  It is provided "as is" without express or implied
+ * warranty.
+ *
+ * THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
+ * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "draglock.h"
+
+#include <assert.h>
+#include <string.h>
+
+static void
+test_config_empty(void)
+{
+	struct draglock dl;
+	int rc;
+
+	rc = draglock_init_from_string(&dl, NULL);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+	assert(rc == 0);
+}
+
+static void
+test_config_invalid(void)
+{
+	struct draglock dl;
+	int rc;
+
+	/* no trailing space */
+	rc = draglock_init_from_string(&dl, "1 ");
+	assert(rc != 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	rc = draglock_init_from_string(&dl, "256");
+	assert(rc != 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	rc = draglock_init_from_string(&dl, "-1");
+	assert(rc != 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	rc = draglock_init_from_string(&dl, "1 2 3");
+	assert(rc != 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	rc = draglock_init_from_string(&dl, "0 2");
+	assert(rc != 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	rc = draglock_init_from_string(&dl, "0 0");
+	assert(rc != 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+}
+
+static void
+test_config_disable(void)
+{
+	struct draglock dl;
+	int rc;
+
+	rc = draglock_init_from_string(&dl, "");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	rc = draglock_init_from_string(&dl, "0");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+}
+
+static void
+test_config_meta_button(void)
+{
+	struct draglock dl;
+	int rc;
+
+	rc = draglock_init_from_string(&dl, "1");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_META);
+	assert(dl.meta_button == 1);
+
+	rc = draglock_init_from_string(&dl, "2");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_META);
+	assert(dl.meta_button == 2);
+
+	rc = draglock_init_from_string(&dl, "10");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_META);
+	assert(dl.meta_button == 10);
+}
+
+static void
+test_config_button_pairs(void)
+{
+	struct draglock dl;
+	int rc;
+
+	rc = draglock_init_from_string(&dl, "1 1");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_PAIRS);
+
+	rc = draglock_init_from_string(&dl, "1 2 3 4 5 6 7 8");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_PAIRS);
+
+	rc = draglock_init_from_string(&dl, "1 2 3 4 5 0 7 8");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_PAIRS);
+
+	/* all disabled */
+	rc = draglock_init_from_string(&dl, "1 0 3 0 5 0 7 0");
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+}
+
+static void
+test_config_get(void)
+{
+	struct draglock dl;
+	int rc;
+	const int sz = 32;
+	int map[sz];
+
+	draglock_init_from_string(&dl, "");
+	rc = draglock_get_meta(&dl);
+	assert(rc == 0);
+	rc = draglock_get_pairs(&dl, map, sz);
+	assert(rc == 0);
+
+	draglock_init_from_string(&dl, "8");
+	rc = draglock_get_meta(&dl);
+	assert(rc == 8);
+	rc = draglock_get_pairs(&dl, map, sz);
+	assert(rc == 0);
+
+	draglock_init_from_string(&dl, "1 2 3 4 5 6");
+	rc = draglock_get_meta(&dl);
+	assert(rc == 0);
+	rc = draglock_get_pairs(&dl, map, sz);
+	assert(rc == 5);
+	assert(map[0] == 0);
+	assert(map[1] == 2);
+	assert(map[2] == 0);
+	assert(map[3] == 4);
+	assert(map[4] == 0);
+	assert(map[5] == 6);
+}
+
+static void
+test_set_meta(void)
+{
+	struct draglock dl;
+	int rc;
+
+	draglock_init_from_string(&dl, "");
+
+	rc = draglock_set_meta(&dl, 0);
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	rc = draglock_set_meta(&dl, 1);
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_META);
+
+	rc = draglock_set_meta(&dl, -1);
+	assert(rc == 1);
+	rc = draglock_set_meta(&dl, 32);
+	assert(rc == 1);
+}
+
+static void
+test_set_pairs(void)
+{
+	struct draglock dl;
+	int rc;
+	const int sz = 32;
+	int map[sz];
+
+	draglock_init_from_string(&dl, "");
+	memset(map, 0, sizeof(map));
+
+	rc = draglock_set_pairs(&dl, map, sz);
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	rc = draglock_set_pairs(&dl, map, 1);
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_DISABLED);
+
+	map[0] = 1;
+	rc = draglock_set_pairs(&dl, map, 1);
+	assert(rc == 1);
+
+	map[0] = 0;
+	map[1] = 2;
+	rc = draglock_set_pairs(&dl, map, sz);
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_PAIRS);
+
+	map[0] = 0;
+	map[1] = 0;
+	map[10] = 8;
+	rc = draglock_set_pairs(&dl, map, sz);
+	assert(rc == 0);
+	assert(dl.mode == DRAGLOCK_PAIRS);
+}
+
+static void
+test_filter_meta_passthrough(void)
+{
+	struct draglock dl;
+	int rc;
+	int button, press;
+	int i;
+
+	rc = draglock_init_from_string(&dl, "10");
+
+	for (i = 0; i < 10; i++) {
+		button = i;
+		press = 1;
+
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == i);
+		assert(press == 1);
+
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == i);
+		assert(press == 1);
+	}
+}
+
+static void
+test_filter_meta_click_meta_only(void)
+{
+	struct draglock dl;
+	int rc;
+	int button, press;
+
+	rc = draglock_init_from_string(&dl, "10");
+
+	button = 10;
+	press = 1;
+
+	rc = draglock_filter_button(&dl, &button, &press);
+	assert(rc == 0);
+	assert(button == 0);
+
+	button = 10;
+	press = 0;
+	rc = draglock_filter_button(&dl, &button, &press);
+	assert(rc == 0);
+	assert(button == 0);
+}
+
+static void
+test_filter_meta(void)
+{
+	struct draglock dl;
+	int rc;
+	int button, press;
+	int i;
+
+	rc = draglock_init_from_string(&dl, "10");
+
+	for (i = 1; i < 10; i++) {
+		/* meta down */
+		button = 10;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* meta up */
+		button = 10;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* button down -> passthrough */
+		button = i;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == i);
+
+		/* button up -> eaten */
+		button = i;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* button down -> eaten */
+		button = i;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* button up -> passthrough */
+		button = i;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == i);
+		assert(press == 0);
+	}
+}
+
+static void
+test_filter_meta_extra_click(void)
+{
+	struct draglock dl;
+	int rc;
+	int button, press;
+	int i;
+
+	rc = draglock_init_from_string(&dl, "10");
+
+	for (i = 1; i < 10; i++) {
+		/* meta down */
+		button = 10;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* meta up */
+		button = 10;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* button down -> passthrough */
+		button = i;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == i);
+
+		/* button up -> eaten */
+		button = i;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* meta down */
+		button = 10;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* meta up */
+		button = 10;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* button down -> eaten */
+		button = i;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* button up -> passthrough */
+		button = i;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == i);
+		assert(press == 0);
+	}
+}
+
+static void
+test_filter_meta_interleaved(void)
+{
+	struct draglock dl;
+	int rc;
+	int button, press;
+	int i;
+
+	rc = draglock_init_from_string(&dl, "10");
+
+	for (i = 1; i < 10; i++) {
+		/* meta down */
+		button = 10;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* meta up */
+		button = 10;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* button down -> passthrough */
+		button = i;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == i);
+
+		/* button up -> eaten */
+		button = i;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+	}
+
+	for (i = 0; i < 10; i++) {
+		/* button down -> eaten */
+		button = i;
+		press = 1;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == 0);
+
+		/* button up -> passthrough */
+		button = i;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		assert(button == i);
+		assert(press == 0);
+	}
+}
+
+static void
+test_filter_pairs(void)
+{
+	struct draglock dl;
+	int rc;
+	int button, press;
+	int i;
+
+	rc = draglock_init_from_string(&dl, "1 11 2 0 3 13 4 0 5 15 6 0 7 17 8 0 9 19");
+
+	for (i = 1; i < 10; i++) {
+		button = i;
+		press = 1;
+
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		if (i % 2)
+			assert(button == i + 10);
+		else
+			assert(button == i);
+		assert(press == 1);
+
+		button = i;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		if (i % 2) {
+			assert(button == 0);
+		} else {
+			assert(button == i);
+			assert(press == 0);
+		}
+	}
+
+	for (i = 1; i < 10; i++) {
+		button = i;
+		press = 1;
+
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		if (i % 2) {
+			assert(button == 0);
+		} else {
+			assert(button == i);
+			assert(press == 1);
+		}
+
+		button = i;
+		press = 0;
+		rc = draglock_filter_button(&dl, &button, &press);
+		assert(rc == 0);
+		if (i % 2)
+			assert(button == i + 10);
+		else
+			assert(button == i);
+		assert(press == 0);
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	test_config_empty();
+	test_config_invalid();
+	test_config_disable();
+	test_config_meta_button();
+	test_config_button_pairs();
+
+	test_config_get();
+	test_set_meta();
+	test_set_pairs();
+
+	test_filter_meta_passthrough();
+	test_filter_meta_click_meta_only();
+	test_filter_meta();
+	test_filter_meta_extra_click();
+	test_filter_meta_interleaved();
+
+	test_filter_pairs();
+
+	return 0;
+}