[Test] Use size ranges for gzip tests to support zlib-ng

Fedora 40+ uses zlib-ng which produces slightly different compressed
sizes than standard zlib. Instead of checking exact sizes, use
reasonable ranges that accommodate both implementations.

diff --git a/test/rspamd_cxx_unit_utils.hxx b/test/rspamd_cxx_unit_utils.hxx
index 1dea7af9d7eee9727994b9467d52be6334618a53..5b0874b1eed9de7befe1483945b898d81cea8a7d 100644 (file)
--- a/test/rspamd_cxx_unit_utils.hxx
+++ b/test/rspamd_cxx_unit_utils.hxx
@@ -94,12 +94,15 @@ TEST_SUITE("rspamd_utils")
                rspamd_fstring_t *fstr;
 
                // Test empty data compression
+               // Note: gzip has 10-byte header + 8-byte trailer = 18 bytes minimum
+               // Different zlib implementations (zlib vs zlib-ng) may produce slightly different sizes
                SUBCASE("Empty data")
                {
                        fstr = rspamd_fstring_new_init("", 0);
                        gboolean result = rspamd_fstring_gzip(&fstr);
                        CHECK(result == TRUE);
-                       CHECK(fstr->len == 20);
+                       CHECK(fstr->len >= 18);// gzip minimum overhead
+                       CHECK(fstr->len <= 24);// reasonable upper bound for empty data
                        result = rspamd_fstring_gunzip(&fstr);
                        CHECK(result == TRUE);
                        CHECK(fstr->len == 0);
@@ -111,7 +114,9 @@ TEST_SUITE("rspamd_utils")
                        fstr = RSPAMD_FSTRING_LIT("helohelo");
                        gboolean result = rspamd_fstring_gzip(&fstr);
                        CHECK(result == TRUE);
-                       CHECK(fstr->len == 26);
+                       // Compressed size varies by zlib implementation (zlib: 26, zlib-ng: 28)
+                       CHECK(fstr->len >= 24);
+                       CHECK(fstr->len <= 32);
                        result = rspamd_fstring_gunzip(&fstr);
                        CHECK(result == TRUE);
                        CHECK(memcmp(fstr->str, "helohelo", fstr->len) == 0);
@@ -127,7 +132,9 @@ TEST_SUITE("rspamd_utils")
                        }
                        gboolean result = rspamd_fstring_gzip(&fstr);
                        CHECK(result == TRUE);
-                       CHECK(fstr->len == 49);
+                       // Highly compressible data, compressed size varies by implementation
+                       CHECK(fstr->len >= 40);
+                       CHECK(fstr->len <= 60);
                        result = rspamd_fstring_gunzip(&fstr);
                        CHECK(result == TRUE);
                        CHECK(memcmp(fstr->str, "helohelo", sizeof("helohelo") - 1) == 0);