test: misc fix and refactor

- Do not exit with status 99.  It is considered a "hard failure"
  in Autotest, and cleanup script won't be executed.
- Fix ATX_FEAT_PREREQ().
- Remove unneeded helper macros.
- Add more log output.

tests/check_sandbox.c

@@ -24,6 +24,7 @@
 
 #include <errno.h>
 #include <stdbool.h>
+#include <string.h>
 
 #include <fcntl.h>
 #include <netinet/in.h>
@@ -176,7 +177,7 @@ check_sandbox (
 
     int dirfd = open(path, O_RDONLY | O_DIRECTORY);
     if (dirfd < 0) {
-        log_printf("failed to open '%s'", path);
+        log_printf("open: %s: %s", path, strerror(errno));
         return -1;
     }
     int status = sandbox_enter(dirfd, flags);

tests/check_watcher.c

@@ -25,6 +25,7 @@
 #include <errno.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <string.h>
 #include <time.h>
 
 #include <fcntl.h>
@@ -169,7 +170,7 @@ check_watcher (
 
     int dirfd = open(path, O_RDONLY | O_DIRECTORY);
     if (dirfd < 0) {
-        log_printf("failed to open '%s'", path);
+        log_printf("open: %s: %s", path, strerror(errno));
         return -1;
     }
 

tests/lib_hash.at

@@ -27,14 +27,14 @@ ATX_CHECK_LIB([
     hash_3=$(calc_digest $seed $input)
     hash_x=$(calc_digest $seed $input+)
 
-    # Given the same seed and input, the digest should be consistent.
     if test "$hash_1" != "$hash_2" -o "$hash_2" != "$hash_3"; then
-        ATX_FAIL
+        echo 'bad hash function: inconsistent digest'
+        exit 1
     fi
 
-    # Bad hash function if we're getting collisions.
     if test "$hash_1" = "$hash_x"; then
-        ATX_FAIL
+        echo 'bad hash function: collision'
+        exit 1
     fi
 ])
 

tests/lib_prng.at

@@ -25,15 +25,15 @@ ATX_CHECK_LIB([
     num_2=$(gen_num $seed $count)
     num_3=$(gen_num $seed $count)
 
-    # Given the same seed, the results should be consistent.
     if test "$num_1" != "$num_2" -o "$num_2" != "$num_3"; then
-        ATX_FAIL
+        echo 'bad prng: inconsistent number sequence'
+        exit 1
     fi
 
-    # Bad PRNG if we're getting duplicates too soon.
     uniq_count=$(echo "$num_1" | sort | uniq | wc -l)
     if test $uniq_count -ne $count; then
-        ATX_FAIL
+        echo 'bad prng: getting duplicates too soon'
+        exit 1
     fi
 ])
 

tests/testsuite.at

@@ -10,12 +10,11 @@ dnl
 AT_INIT
 
 dnl
-dnl  Fail or skip the current test.
+dnl  ATX_REPEAT(n, string)
 dnl
-dnl  The status codes are defined by Autotest.
+dnl  Repeat string n times.
 dnl
-m4_define([ATX_FAIL], [exit 99])
-m4_define([ATX_SKIP], [exit 77])
+m4_define([ATX_REPEAT], [m4_for([unused_], [1], [$1], , [$2])])
 
 dnl
 dnl  ATX_FEAT_VAR(feature)
@@ -46,8 +45,8 @@ dnl
 dnl  If any of the given features is not enabled, skip the current test.
 dnl
 m4_define([ATX_FEAT_PREREQ], [
-    if test -z "m4_map([ATX_FEAT_VAR], [$@])"; then
-        ATX_SKIP
+    if test "m4_map([ATX_FEAT_VAR], [$@])" != ATX_REPEAT([$#], [y]); then
+        exit 77
     fi
 ])
 
@@ -58,13 +57,7 @@ dnl  Run a pipeline of shell command(s).
 dnl  If it exits with a non-zero status, fail the current test.
 dnl
 m4_define([ATX_RUN_ONE], [
-    m4_ifnblank([$1], [
-        if $1; then :
-        else
-            echo "exit status: $?"
-            ATX_FAIL
-        fi
-    ])
+    m4_ifnblank([$1], [$1 || exit $?])
 ])
 
 dnl