[PATCH v3] app/test: add support for skipping tests

[Bruce Richardson <bruce.richardson@intel.com>]

When called from automated tools, like meson test, it is often useful to
skip tests in a test suite, without having to alter the test build. To
do so, we add support for DPDK_TEST_SKIP environment variable, where one
can provide a comma-separated list of tests. When the test binary is
called to run one of the tests on the list via either cmdline parameter
or environment variable (as done with meson test), the test will not
actually be run, but will be reported skipped.

Example run:
  $ DPDK_TEST_SKIP=dump_devargs,dump_ring meson test --suite=debug-tests
  ...
  1/9 DPDK:debug-tests / dump_devargs             SKIP            1.11s
  2/9 DPDK:debug-tests / dump_log_types           OK              1.06s
  3/9 DPDK:debug-tests / dump_malloc_heaps        OK              1.11s
  4/9 DPDK:debug-tests / dump_malloc_stats        OK              1.07s
  5/9 DPDK:debug-tests / dump_mempool             OK              1.11s
  6/9 DPDK:debug-tests / dump_memzone             OK              1.06s
  7/9 DPDK:debug-tests / dump_physmem             OK              1.13s
  8/9 DPDK:debug-tests / dump_ring                SKIP            1.04s
  9/9 DPDK:debug-tests / dump_struct_sizes        OK              1.10s

  Ok:                 7
  Expected Fail:      0
  Fail:               0
  Unexpected Pass:    0
  Skipped:            2
  Timeout:            0

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>

---
V3: Fix checkpatch whitespace issue

V2: Check return value from rte_strsplit, just in case.
---
 app/test/test.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/app/test/test.c b/app/test/test.c
index fb073ff795..bfa9ea52e3 100644
--- a/app/test/test.c
+++ b/app/test/test.c
@@ -193,6 +193,25 @@ main(int argc, char **argv)
 
 	if (test_count > 0) {
 		char buf[1024];
+		char *dpdk_test_skip = getenv("DPDK_TEST_SKIP");
+		char *skip_tests[128] = {0};
+		size_t n_skip_tests = 0;
+
+		if (dpdk_test_skip != NULL && strlen(dpdk_test_skip) > 0) {
+			int split_ret;
+			char *dpdk_test_skip_cp = strdup(dpdk_test_skip);
+			if (dpdk_test_skip_cp == NULL) {
+				ret = -1;
+				goto out;
+			}
+			dpdk_test_skip = dpdk_test_skip_cp;
+			split_ret = rte_strsplit(dpdk_test_skip, strlen(dpdk_test_skip),
+					skip_tests, RTE_DIM(skip_tests), ',');
+			if (split_ret > 0)
+				n_skip_tests = split_ret;
+			else
+				free(dpdk_test_skip);
+		}
 
 		cl = cmdline_new(main_ctx, "RTE>>", 0, 1);
 		if (cl == NULL) {
@@ -201,6 +220,15 @@ main(int argc, char **argv)
 		}
 
 		for (i = 0; i < test_count; i++) {
+			/* check if test is to be skipped */
+			for (size_t j = 0; j < n_skip_tests; j++) {
+				if (strcmp(tests[i], skip_tests[j]) == 0) {
+					fprintf(stderr, "Skipping %s [DPDK_TEST_SKIP]\n", tests[i]);
+					ret = TEST_SKIPPED;
+					goto end_of_cmd;
+				}
+			}
+
 			snprintf(buf, sizeof(buf), "%s\n", tests[i]);
 			if (cmdline_parse_check(cl, buf) < 0) {
 				printf("Error: invalid test command: '%s'\n", tests[i]);
@@ -211,9 +239,13 @@ main(int argc, char **argv)
 			} else
 				ret = last_test_result;
 
+end_of_cmd:
 			if (ret != 0)
 				break;
 		}
+		if (n_skip_tests > 0)
+			free(dpdk_test_skip);
+
 		cmdline_free(cl);
 		goto out;
 	} else {
-- 
2.39.2