Fix unit tests for FreeBSD

putenv() string must contain '='
environment failure test is invalid if argument is NULL

debian/changelog

@@ -2,6 +2,8 @@ libxcb (1.0-2) unstable; urgency=low
 
   * Incorporate NMU by Julien Cristau; thanks, Julien!
   * Add XS-Vcs-Browser field to debian/control.
+  * Cherry-pick post-1.0 changes from master:
+    * " Fix unit tests for FreeBSD"
   * Upload to unstable.
 
  -- Josh Triplett <josh@freedesktop.org>  Mon, 21 May 2007 12:48:40 -0700

tests/check_public.c

@@ -24,7 +24,7 @@ static void parse_display_pass(const char *name, const char *host, const int dis
 		if(test_type == TEST_ARGUMENT)
 		{
 			argument = name;
-			putenv("DISPLAY");
+			putenv("DISPLAY=");
 		}
 		else if(test_type == TEST_ENVIRONMENT)
 		{
@@ -49,7 +49,7 @@ static void parse_display_pass(const char *name, const char *host, const int dis
 		fail_unless(strcmp(host, got_host) == 0, "screenless parse %sproduced unexpected hostname '%s' for '%s': expected '%s'", test_string[test_type], got_host, name, host);
 		fail_unless(display == got_display, "screenless parse %sproduced unexpected display '%d' for '%s': expected '%d'", test_string[test_type], got_display, name, display);
 	}
-	putenv("DISPLAY");
+	putenv("DISPLAY=");
 }
 
 static void parse_display_fail(const char *name)
@@ -65,10 +65,11 @@ static void parse_display_fail(const char *name)
 		if(test_type == TEST_ARGUMENT)
 		{
 			argument = name;
-			putenv("DISPLAY");
+			putenv("DISPLAY=");
 		}
 		else if(test_type == TEST_ENVIRONMENT)
 		{
+			if (!name) break;
 			argument = 0;
 			setenv("DISPLAY", name, 1);
 		}
@@ -90,7 +91,7 @@ static void parse_display_fail(const char *name)
 		fail_unless(got_host == (char *) -1, "host changed on parse failure %sfor '%s': got %p", test_string[test_type], name, got_host);
 		fail_unless(got_display == -42, "display changed on parse failure %sfor '%s': got %d", test_string[test_type], name, got_display);
 	}
-	putenv("DISPLAY");
+	putenv("DISPLAY=");
 }
 
 START_TEST(parse_display_unix)
@@ -182,7 +183,7 @@ END_TEST
 Suite *public_suite(void)
 {
 	Suite *s = suite_create("Public API");
-	putenv("DISPLAY");
+	putenv("DISPLAY=");
 	suite_add_test(s, parse_display_unix, "xcb_parse_display unix");
 	suite_add_test(s, parse_display_ip, "xcb_parse_display ip");
 	suite_add_test(s, parse_display_ipv4, "xcb_parse_display ipv4");