Fix unit test for get_library_version for release commits

`git describe` may return a tag name or <tag>-<n>-g<hash>, where <n> is
the number of commits since the last tag <tag> and <hash> is the hash of
the current commit.  The current test case only considers the latter
case.  This patch adds a regular expression to handle both cases.

1 files changed, 11 insertions, 2 deletions

diff --git a/unittest/test_offline.cc b/unittest/test_offline.cc
index aad875f..6f52a61 100644
--- a/unittest/test_offline.cc
+++ b/unittest/test_offline.cc
@@ -22,6 +22,8 @@
 #include "catch.hpp"
 #include <NitrokeyManager.h>
 #include <memory>
+#include <string>
+#include <regex>
 #include "../NK_C_API.h"
 
 using namespace nitrokey::proto;
@@ -167,7 +169,14 @@ TEST_CASE("Test version getter", "[fast]") {
   REQUIRE(nitrokey::get_minor_library_version() >= 3u);
   const char *library_version = nitrokey::get_library_version();
   REQUIRE(library_version != nullptr);
+
+  // The library version has to match the pattern returned by git describe:
+  // v<major>.<minor> or v<major>.<minor>-<n>-g<hash>, where <n> is the number
+  // of commits since the last tag, and <hash> is the hash of the current
+  // commit.  (This assumes that all tags have the name v<major>.<minor>.)
   std::string s = library_version;
-  REQUIRE(s.length() >= 8);
-  REQUIRE(s.find("g") != std::string::npos);
+  std::string version("v[0-9]+\\.[0-9]+");
+  std::string git_suffix("-[0-9]+-g[0-9a-z]+");
+  std::regex pattern(version + "(" + git_suffix + "|)");
+  REQUIRE(std::regex_match(s, pattern));
 }