Add expression test runner to Bazel (#1464)

platform/linux/src/headless_backend_glx.cpp

@@ -7,6 +7,7 @@
 #ifdef CI_BUILD
 #include <chrono>
 #include <thread>
+#include <iostream>
 #endif
 
 #include <GL/glx.h>
@@ -31,7 +32,7 @@ public:
 
 #ifdef CI_BUILD
         // XOpenDisplay has proven very unreliable on CI, perform some retries if it fails
-        constexpr auto CI_RETRIES = 10;
+        constexpr auto CI_RETRIES = 20;
         for (int i = 0; i < CI_RETRIES; i++) {
 #endif
             xDisplay = XOpenDisplay(nullptr);
@@ -39,7 +40,8 @@ public:
             if (xDisplay != nullptr) {
                 break;
             }
-            Log::Debug(Event::OpenGL, "[CI] Failed to open X display, retrying...");
+            // std::cerr is used because the tests expect logging to be deterministic
+            std::cerr << "[CI] Failed to open X display, retrying..." << std::endl;
             std::this_thread::sleep_for(std::chrono::milliseconds(500));
         }
 #endif