Fix unit_test fail doesn't result in error in CI (#270)

include/Compiler/Command.h

@@ -205,10 +205,10 @@ struct DenseMapInfo<llvm::ArrayRef<const char*>> {
 
 template <>
 struct std::formatter<clice::CompilationDatabase::QueryDriverError> :
-    std::formatter<llvm::StringRef> {
+    std::formatter<std::string_view> {
 
     template <typename FormatContext>
-    auto format(clice::CompilationDatabase::QueryDriverError& e, FormatContext& ctx) const {
+    auto format(const clice::CompilationDatabase::QueryDriverError& e, FormatContext& ctx) const {
         return std::format_to(ctx.out(), "{} {}", e.kind.name(), e.detail);
     }
 };

include/Test/Test.h

@@ -103,6 +103,7 @@ constexpr inline struct {
                             std::source_location location = std::source_location::current()) const {
         bool failed = false;
         std::string expression = "false";
+        std::string message;
 
         if constexpr(is_expr_v<TExpr>) {
             auto result = expr();
@@ -115,10 +116,20 @@ constexpr inline struct {
         } else {
             if(!static_cast<bool>(expr)) {
                 failed = true;
+
+                if constexpr(requires { expr.error(); }) {
+                    message = std::format("{}", expr.error());
+                }
             }
         }
 
-        return may_failure{failed, false, expression, location};
+        return may_failure{
+            failed,
+            false,
+            std::move(expression),
+            location,
+            std::move(message),
+        };
     }
 } expect;