lib-compression: Fix test-compression to build without zlib

src/lib-compression/test-compression.c

@@ -7,7 +7,6 @@
 #include "sha1.h"
 #include "randgen.h"
 #include "test-common.h"
-#include "istream-zlib.h"
 #include "compression.h"
 
 #include <unistd.h>
@@ -155,13 +154,14 @@ static void test_gz_concat(void)
 
 static void test_gz_no_concat(void)
 {
-	test_begin("gz concat");
+	test_begin("gz no concat");
 	test_gz("hello", "");
 	test_end();
 }
 
 static void test_gz_large_header(void)
 {
+	const struct compression_handler *gz = compression_lookup_handler("gz");
 	static const unsigned char gz_input[] = {
 		0x1f, 0x8b, 0x08, 0x08,
 		'a','a','a','a','a','a','a','a','a','a','a',
@@ -170,6 +170,9 @@ static void test_gz_large_header(void)
 	struct istream *file_input, *input;
 	size_t i;
 
+	if (gz == NULL || gz->create_istream == NULL)
+		return; /* not compiled in */
+
 	test_begin("gz large header");
 
 	/* max buffer size smaller than gz header */
@@ -178,7 +181,7 @@ static void test_gz_large_header(void)
 		test_istream_set_size(file_input, i);
 		test_istream_set_max_buffer_size(file_input, i);
 
-		input = i_stream_create_gz(file_input, FALSE);
+		input = gz->create_istream(file_input, FALSE);
 		test_assert_idx(i_stream_read(input) == 0, i);
 		test_assert_idx(i_stream_read(input) == -1 &&
 				input->stream_errno == EINVAL, i);
@@ -188,7 +191,7 @@ static void test_gz_large_header(void)
 
 	/* max buffer size is exactly the gz header */
 	file_input = test_istream_create_data(gz_input, sizeof(gz_input));
-	input = i_stream_create_gz(file_input, FALSE);
+	input = gz->create_istream(file_input, FALSE);
 	test_istream_set_size(input, i);
 	test_istream_set_allow_eof(input, FALSE);
 	test_istream_set_max_buffer_size(input, i);