From bd575f15c54fda6c68d09bccc43f2baf05586d8f Mon Sep 17 00:00:00 2001
From: Joseph Lenox <lenox.joseph@gmail.com>
Date: Fri, 17 May 2019 12:21:50 -0500
Subject: [PATCH] Ensure rand() is available, create consistent seed.

---
 src/test/libslic3r/test_extrusion_entity.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/test/libslic3r/test_extrusion_entity.cpp b/src/test/libslic3r/test_extrusion_entity.cpp
index 090b847b9..6d07af0ec 100644
--- a/src/test/libslic3r/test_extrusion_entity.cpp
+++ b/src/test/libslic3r/test_extrusion_entity.cpp
@@ -2,6 +2,7 @@
 #include "ExtrusionEntityCollection.hpp"
 #include "ExtrusionEntity.hpp"
 #include "Point.hpp"
+#include <cstdlib>
 
 Point random_point(float LO=-50, float HI=50) {
     float x = LO + static_cast <float> (rand()) /( static_cast <float> (RAND_MAX/(HI-LO)));
@@ -28,6 +29,9 @@ ExtrusionPaths random_paths(size_t count=10, size_t length=20, float LO=-50, flo
 using namespace Slic3r;
 
 SCENARIO("ExtrusionEntityCollection: Polygon flattening") {
+    srand(0xDEADBEEF); // consistent seed for test reproducibility.
+
+    // Generate one specific random path set and save it for later comparison
     ExtrusionPaths nosort_path_set {random_paths()};
 
     ExtrusionEntityCollection sub_nosort;