From 749cb335e3394ae94ac655eac1ca6ccd4d090901 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Sat, 24 Aug 2024 19:19:27 +0100
Subject: [PATCH] Make test failure more verbose

Outputting the state of the map and this history of operations makes
debugging easier.
---
 tests/unit/unit_test.cc | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tests/unit/unit_test.cc b/tests/unit/unit_test.cc
index a99c643..a5d2c5c 100644
--- a/tests/unit/unit_test.cc
+++ b/tests/unit/unit_test.cc
@@ -2,6 +2,7 @@
 
 #include <interval-map/interval-map.hh>
 
+#include <sstream>
 #include <type_traits>
 
 #include "model.hh"
@@ -86,10 +87,28 @@ protected:
     }
 
     void check() const {
+        SCOPED_TRACE(stringify_map());
+        SCOPED_TRACE(stringify_operations());
         check_ranges();
         check_canonicity();
     }
 
+    std::string stringify_map() const {
+        std::ostringstream out;
+        out << "map: ";
+        for (const auto& [key, val] : map.underlying_)
+            out << "[" << +key << ": " << +val << "]";
+        return out.str();
+    }
+
+    std::string stringify_operations() const {
+        std::ostringstream out;
+        out << "ops: ";
+        for (const auto& [start, end, val] : model.ranges_)
+            out << "[" << +start << ":" << +end << " => " << +val << "]";
+        return out.str();
+    }
+
     // Compare against the fake 'Model' implementation
     void check_ranges() const {
         auto i = std::numeric_limits<key_type>::min();