From 0b170434b41b473341e8896869a95381bc1c2fbb Mon Sep 17 00:00:00 2001
From: Vasile Vilvoiu <vasi@vilvoiu.ro>
Date: Thu, 22 Jul 2021 22:07:12 +0300
Subject: Skip GetNiceTicks test when no Xorg is started.

---
 .github/workflows/build.yml |  2 +-
 CMakeLists.txt              |  5 +++--
 test/test-renderer.cpp      | 10 ++++++++++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8fa439f..177f610 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,7 +18,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Install dependencies
-      run: sudo apt-get install libfftw3-dev libsfml-dev libgtest-dev
+      run: sudo apt-get install libfftw3-dev libsfml-dev libgtest-dev libx11-dev
 
     - name: Create Build Environment
       # Some projects don't allow in-source building, so create a separate build directory
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d6810b1..ba7b6e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,6 +22,7 @@ find_library (FFTW3 fftw3)
 
 if (TESTING)
     find_package(GTest)
+    find_package(X11)
 endif()
 
 # Compiler setup
@@ -31,7 +32,7 @@ add_compile_options (-Wall -Wextra -pedantic)
 set (SRC_DIR "${PROJECT_SOURCE_DIR}/src")
 set (MAN_DIR "${PROJECT_SOURCE_DIR}/man")
 
-include_directories (${SOURCE_DIR})
+include_directories (${SOURCE_DIR} ${X11_INCLUDE_DIR})
 
 # Get the latest abbreviated commit hash of the working branch
 # https://jonathanhamberg.com/post/cmake-embedding-git-hash/
@@ -107,6 +108,6 @@ if (TESTING)
     # Unit tests
     enable_testing ()
     add_executable(unittest ${UNIT_TEST_SOURCES})
-    target_link_libraries (unittest GTest::GTest ${PROJECT_NAME}_static Threads::Threads sfml-graphics ${FFTW3})
+    target_link_libraries (unittest GTest::GTest ${PROJECT_NAME}_static Threads::Threads sfml-graphics ${FFTW3} ${X11_LIBRARIES})
     gtest_discover_tests (unittest)
 endif()
diff --git a/test/test-renderer.cpp b/test/test-renderer.cpp
index d6b4284..be8d49c 100644
--- a/test/test-renderer.cpp
+++ b/test/test-renderer.cpp
@@ -6,6 +6,7 @@
  */
 #include "test.hpp"
 #include "../src/renderer.hpp"
+#include <X11/Xlib.h>
 
 class ExposedRenderer : public Renderer
 {
@@ -129,6 +130,15 @@ TEST(TestRenderer, GetLinearTicks)
 
 TEST(TestRenderer, GetNiceTicks)
 {
+    { /* skip if Xorg not started */
+        auto display = XOpenDisplay(nullptr);
+        if (display == nullptr) {
+            GTEST_SKIP();
+        } else {
+            XCloseDisplay(display);
+        }
+    }
+
     constexpr double epsilon = 1e-9;
 
     /* configuration */
-- 
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