Don't create fixtures for simple tests

The test fixtures are (meant to be) useful for sharing common
setup. Don't bother when we don't have any setup/teardown.

This only addresses simple tests. Parameterized tests (ADD_ALL_TESTS)
will be made more user-friendly in a follow-up.

Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/test/d2i_test.c b/test/d2i_test.c
index c536764..e12f249 100644
--- a/test/d2i_test.c
+++ b/test/d2i_test.c
@@ -41,18 +41,7 @@
 
 static expected_error_t expected_error = ASN1_UNKNOWN;
 
-typedef struct d2i_test_fixture {
-    const char *test_case_name;
-} D2I_TEST_FIXTURE;
-
-static D2I_TEST_FIXTURE set_up(const char *const test_case_name)
-{
-    D2I_TEST_FIXTURE fixture;
-    fixture.test_case_name = test_case_name;
-    return fixture;
-}
-
-static int execute_test(D2I_TEST_FIXTURE fixture)
+static int test_bad_asn1()
 {
     BIO *bio = NULL;
     ASN1_VALUE *value = NULL;
@@ -116,22 +105,6 @@
     return ret;
 }
 
-static void tear_down(D2I_TEST_FIXTURE fixture)
-{
-}
-
-#define SETUP_D2I_TEST_FIXTURE() \
-    SETUP_TEST_FIXTURE(D2I_TEST_FIXTURE, set_up)
-
-#define EXECUTE_D2I_TEST() \
-    EXECUTE_TEST(execute_test, tear_down)
-
-static int test_bad_asn1()
-{
-    SETUP_D2I_TEST_FIXTURE();
-    EXECUTE_D2I_TEST();
-}
-
 /*
  * Usage: d2i_test <type> <file>, e.g.
  * d2i_test generalname bad_generalname.der