tests: Centralize VIR_TEST_DEBUG lookup, and document it

Provide a simple interface for other tests to lookup the testDebug variable.
Also remove a redundant error message in interface tests.

If anyone feels inclined to change this env variable to match the existing
LIBVIRT_* format, it should now be easier to do so.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/testutilsqemu.c b/tests/testutilsqemu.c
index 9269f5cf8..eeeb5eca5 100644
--- a/tests/testutilsqemu.c
+++ b/tests/testutilsqemu.c
@@ -132,7 +132,7 @@ virCapsPtr testQemuCapsInit(void) {
                                       NULL) == NULL)
         goto cleanup;
 
-    if (testDebug) {
+    if (virtTestGetDebug()) {
         char *caps_str;
 
         caps_str = virCapabilitiesFormatXML(caps);