Revert "Remove tests that depend on TLS or X.509"

This reverts commit 9afb2e992136db3fae9a669c3faaf6d5d27602a8.

Conflicts:
* include/CMakeLists.txt
  * "Make config.h available" comment: there has been a change
    adjacent to where it was removed. Just re-add what was removed.
* tests/CMakeLists.txt:
  * compat.sh: there has been a change immediately before where it was
    removed. Just re-add what was removed.
diff --git a/tests/suites/test_suite_debug.function b/tests/suites/test_suite_debug.function
new file mode 100644
index 0000000..377d630
--- /dev/null
+++ b/tests/suites/test_suite_debug.function
@@ -0,0 +1,195 @@
+/* BEGIN_HEADER */
+#include "mbedtls/debug.h"
+#include "string.h"
+
+struct buffer_data
+{
+    char buf[2000];
+    char *ptr;
+};
+
+void string_debug(void *data, int level, const char *file, int line, const char *str)
+{
+    struct buffer_data *buffer = (struct buffer_data *) data;
+    char *p = buffer->ptr;
+    ((void) level);
+
+    memcpy( p, file, strlen( file ) );
+    p += strlen( file );
+
+    *p++ = '(';
+    *p++ = '0' + ( line / 1000 ) % 10;
+    *p++ = '0' + ( line / 100  ) % 10;
+    *p++ = '0' + ( line / 10   ) % 10;
+    *p++ = '0' + ( line / 1    ) % 10;
+    *p++ = ')';
+    *p++ = ':';
+    *p++ = ' ';
+
+#if defined(MBEDTLS_THREADING_C)
+    /* Skip "thread ID" (up to the first space) as it is not predictable */
+    while( *str++ != ' ' );
+#endif
+
+    memcpy( p, str, strlen( str ) );
+    p += strlen( str );
+
+    /* Detect if debug messages output partial lines and mark them */
+    if( p[-1] != '\n' )
+        *p++ = '*';
+
+    buffer->ptr = p;
+}
+/* END_HEADER */
+
+/* BEGIN_DEPENDENCIES
+ * depends_on:MBEDTLS_DEBUG_C:MBEDTLS_SSL_TLS_C
+ * END_DEPENDENCIES
+ */
+
+/* BEGIN_CASE */
+void debug_print_msg_threshold( int threshold, int level, char * file,
+                                int line, char * result_str )
+{
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    struct buffer_data buffer;
+
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    memset( buffer.buf, 0, 2000 );
+    buffer.ptr = buffer.buf;
+
+    TEST_ASSERT( mbedtls_ssl_setup( &ssl, &conf ) == 0 );
+
+    mbedtls_debug_set_threshold( threshold );
+    mbedtls_ssl_conf_dbg( &conf, string_debug, &buffer);
+
+    mbedtls_debug_print_msg( &ssl, level, file, line,
+                             "Text message, 2 == %d", 2 );
+
+    TEST_ASSERT( strcmp( buffer.buf, result_str ) == 0 );
+
+exit:
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void mbedtls_debug_print_ret( char * file, int line, char * text, int value,
+                              char * result_str )
+{
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    struct buffer_data buffer;
+
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    memset( buffer.buf, 0, 2000 );
+    buffer.ptr = buffer.buf;
+
+    TEST_ASSERT( mbedtls_ssl_setup( &ssl, &conf ) == 0 );
+
+    mbedtls_ssl_conf_dbg( &conf, string_debug, &buffer);
+
+    mbedtls_debug_print_ret( &ssl, 0, file, line, text, value);
+
+    TEST_ASSERT( strcmp( buffer.buf, result_str ) == 0 );
+
+exit:
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void mbedtls_debug_print_buf( char * file, int line, char * text,
+                              data_t * data, char * result_str )
+{
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    struct buffer_data buffer;
+
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    memset( buffer.buf, 0, 2000 );
+    buffer.ptr = buffer.buf;
+
+
+    TEST_ASSERT( mbedtls_ssl_setup( &ssl, &conf ) == 0 );
+
+    mbedtls_ssl_conf_dbg( &conf, string_debug, &buffer);
+
+    mbedtls_debug_print_buf( &ssl, 0, file, line, text, data->x, data->len );
+
+    TEST_ASSERT( strcmp( buffer.buf, result_str ) == 0 );
+
+exit:
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
+void mbedtls_debug_print_crt( char * crt_file, char * file, int line,
+                              char * prefix, char * result_str )
+{
+    mbedtls_x509_crt   crt;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    struct buffer_data buffer;
+
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    mbedtls_x509_crt_init( &crt );
+    memset( buffer.buf, 0, 2000 );
+    buffer.ptr = buffer.buf;
+
+    TEST_ASSERT( mbedtls_ssl_setup( &ssl, &conf ) == 0 );
+
+    mbedtls_ssl_conf_dbg( &conf, string_debug, &buffer);
+
+    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );
+    mbedtls_debug_print_crt( &ssl, 0, file, line, prefix, &crt);
+
+    TEST_ASSERT( strcmp( buffer.buf, result_str ) == 0 );
+
+exit:
+    mbedtls_x509_crt_free( &crt );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_BIGNUM_C */
+void mbedtls_debug_print_mpi( int radix, char * value, char * file, int line,
+                              char * prefix, char * result_str )
+{
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    struct buffer_data buffer;
+    mbedtls_mpi val;
+
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    mbedtls_mpi_init( &val );
+    memset( buffer.buf, 0, 2000 );
+    buffer.ptr = buffer.buf;
+
+    TEST_ASSERT( mbedtls_ssl_setup( &ssl, &conf ) == 0 );
+
+    TEST_ASSERT( mbedtls_mpi_read_string( &val, radix, value ) == 0 );
+
+    mbedtls_ssl_conf_dbg( &conf, string_debug, &buffer);
+
+    mbedtls_debug_print_mpi( &ssl, 0, file, line, prefix, &val);
+
+    TEST_ASSERT( strcmp( buffer.buf, result_str ) == 0 );
+
+exit:
+    mbedtls_mpi_free( &val );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+}
+/* END_CASE */