Unit test: rework to be able to run API tests individually

Change API test cases to return a result.
Test success is now TEST_SUCCESS (1).
Test result can be returned with use of macro TEST_RES_CHECK().
Always print the id, name of the test and the result (skipped or
otherwise) before and after running the test case.

Changed test case output to go to stderr.
Fixed some formatting.

Add option to take index and/or name of test case to run.
Added option to list all API tests.
Added option to only run API tests.
Added options to show usage.

tests/unit.c

@@ -33,6 +33,7 @@
 #include <wolfssl/wolfcrypt/fips_test.h>
 
 
+int allTesting = 1;
 int myoptind = 0;
 char* myoptarg = NULL;
 int unit_test(int argc, char** argv);
@@ -44,6 +45,21 @@ int main(int argc, char** argv)
 }
 #endif
 
+/* Print usage options for unit test.
+ */
+static void UnitTest_Usage(void)
+{
+    printf("Usage: ./tests/unit.test <options>\n");
+    printf(" -?, --help     Display this usage information.\n");
+    printf(" --list         List the API tests.\n");
+    printf(" --api          Only perform API tests.\n");
+    printf(" -<number>      Run the API test identified by number.\n");
+    printf("                Can be specified multiple times.\n");
+    printf(" -<string>      Run the API test identified by name.\n");
+    printf("                Can be specified multiple times.\n");
+    printf(" <filename>     Name of cipher suite testing file.\n");
+}
+
 int unit_test(int argc, char** argv)
 {
     int ret = 0;
@@ -154,12 +170,50 @@ int unit_test(int argc, char** argv)
     }
 #endif
 #endif /* HAVE_FIPS && HAVE_FIPS_VERSION == 5 */
+
+    while (argc > 1) {
+        if (argv[1][0] != '-') {
+            break;
+        }
+
+        if (XSTRCMP(argv[1], "-?") == 0 || XSTRCMP(argv[1], "--help") == 0) {
+            UnitTest_Usage();
+            goto exit;
+        }
+        else if (XSTRCMP(argv[1], "--list") == 0) {
+            ApiTest_PrintTestCases();
+            goto exit;
+        }
+        else if (XSTRCMP(argv[1], "--api") == 0) {
+        }
+        else if (argv[1][1] >= '0' && argv[1][1] <= '9') {
+            ret = ApiTest_RunIdx(atoi(argv[1] + 1));
+            if (ret != 0) {
+                goto exit;
+            }
+        }
+        else {
+            ret = ApiTest_RunName(argv[1] + 1);
+            if (ret != 0) {
+                goto exit;
+            }
+        }
+
+        allTesting = 0;
+        argc--;
+        argv++;
+    }
+
 #ifdef WOLFSSL_ALLOW_SKIP_UNIT_TESTS
     if (argc == 1)
 #endif
     {
         ApiTest();
 
+        if (!allTesting) {
+            goto exit;
+        }
+
         if ((ret = HashTest()) != 0) {
             fprintf(stderr, "hash test failed with %d\n", ret);
             goto exit;
@@ -172,8 +226,6 @@ int unit_test(int argc, char** argv)
         }
     #endif /* WOLFSSL_W64_WRAPPER */
 
-    }
-
     #ifdef WOLFSSL_QUIC
         if ((ret = QuicTest()) != 0) {
             printf("quic test failed with %d\n", ret);
@@ -182,6 +234,7 @@ int unit_test(int argc, char** argv)
     #endif
 
         SrpTest();
+    }
 
 #ifndef NO_WOLFSSL_CIPHER_SUITE_TEST
 #if !defined(NO_WOLFSSL_CLIENT) && !defined(NO_WOLFSSL_SERVER)

tests/unit.h

@@ -110,7 +110,11 @@
 #define AssertPtrLE(x, y) AssertPtr(x, y, <=,  >)
 
 
+void ApiTest_PrintTestCases(void);
+int ApiTest_RunIdx(int idx);
+int ApiTest_RunName(char* name);
 void ApiTest(void);
+
 int  SuiteTest(int argc, char** argv);
 int  HashTest(void);
 void SrpTest(void);