test: Make testing work on systems without or old systemd

* Introduce a macro to conditionally execute tests. This avoids
  skipping the entire test if some parts require systemd
* Skip the journal tests when no /etc/machine-id is present
* Change test-catalog to load the catalog from the source directory
  of systemd.
* /proc/PID/comm got introduced in v2.6.33 but travis is still
  using v2.6.32.
* Enable make check and make distcheck on the travis build
* Use -D"CATALOG_DIR=STR($(abs_top_srcdir)/catalog)" as a STRINGIY
  would result in the path '/home/ich/source/linux' to be expanded
  to '/home/ich/source/1' as linux is defined to 1.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/test/test-unit-name.c b/src/test/test-unit-name.c
index 6776ef0857..c17692b845 100644
--- a/src/test/test-unit-name.c
+++ b/src/test/test-unit-name.c
@@ -34,6 +34,7 @@
 #include "specifier.h"
 #include "util.h"
 #include "macro.h"
+#include "test-helper.h"
 
 static void test_replacements(void) {
 #define expect(pattern, repl, expected)                            \
@@ -196,6 +197,8 @@ static int test_unit_printf(void) {
 }
 
 int main(int argc, char* argv[]) {
+        int rc = 0;
         test_replacements();
-        return test_unit_printf();
+        TEST_REQ_RUNNING_SYSTEMD(rc = test_unit_printf());
+        return rc;
 }