✅ Improve log FATAL tests

Author: elbeno

test/log/log.cpp

@@ -7,21 +7,39 @@
 #include <catch2/catch_test_macros.hpp>
 
 #include <iterator>
+#include <optional>
 #include <string>
 #include <string_view>
 
 namespace {
 bool panicked{};
+std::string_view expected_why{};
+std::optional<int> expected_arg{};
 
 struct injected_handler {
-    template <stdx::ct_string Why, typename... Ts>
-    static auto panic(Ts &&...) noexcept -> void {
-        static_assert(std::string_view{Why}.starts_with("Hello"));
+    template <stdx::ct_string Why, typename... Args>
+    static auto panic(Args &&...args) noexcept -> void {
+        constexpr auto s = std::string_view{Why};
+        CAPTURE(s);
+        CHECK(s.ends_with(expected_why));
         panicked = true;
+        if (expected_arg) {
+            CHECK(sizeof...(Args) == 1);
+            if constexpr (sizeof...(Args) == 1) {
+                CHECK(*expected_arg == (args, ...));
+            }
+        }
     }
 };
 
 std::string buffer{};
+
+auto reset_test_state() {
+    panicked = false;
+    expected_why = {};
+    expected_arg.reset();
+    buffer.clear();
+}
 } // namespace
 
 template <>
@@ -31,34 +49,48 @@ inline auto logging::config<> =
 template <> inline auto stdx::panic_handler<> = injected_handler{};
 
 TEST_CASE("CIB_FATAL logs the string", "[log]") {
+    reset_test_state();
+
     CIB_FATAL("Hello");
     CAPTURE(buffer);
-    CHECK(buffer.substr(buffer.size() - std::size("Hello")) == "Hello\n");
+    CHECK(buffer.find("Hello") != std::string::npos);
 }
 
 TEST_CASE("CIB_FATAL respects the log module", "[log]") {
+    reset_test_state();
+
     CIB_LOG_MODULE("test");
     CIB_FATAL("Hello");
     CAPTURE(buffer);
-    CHECK(buffer.substr(buffer.size() - std::size("FATAL [test]: Hello")) ==
-          "FATAL [test]: Hello\n");
+    CHECK(buffer.find("FATAL [test]: Hello") != std::string::npos);
 }
 
 TEST_CASE("CIB_FATAL calls compile-time panic", "[log]") {
-    panicked = false;
+    reset_test_state();
+    expected_why = "Hello";
+
     CIB_FATAL("Hello");
     CHECK(panicked);
 }
 
 TEST_CASE("CIB_FATAL pre-formats arguments passed to panic", "[log]") {
-    panicked = false;
-    CIB_FATAL("{}", "Hello"_sc);
+    reset_test_state();
+    expected_why = "Hello 42";
+
+    CIB_FATAL("{} {}", "Hello"_sc, sc::int_<42>);
+    CAPTURE(buffer);
+    CHECK(buffer.find("Hello 42") != std::string::npos);
     CHECK(panicked);
 }
 
 TEST_CASE("CIB_FATAL can format stack arguments", "[log]") {
-    panicked = false;
+    reset_test_state();
+    expected_why = "Hello {}";
+    expected_arg = 42;
+
     auto x = 42;
     CIB_FATAL("Hello {}", x);
+    CAPTURE(buffer);
+    CHECK(buffer.find("Hello 42") != std::string::npos);
     CHECK(panicked);
 }