T73268: Link C/C++ unit tests into single executable

This commit introduces a new way to build unit tests. It is now possible
for each module to generate its own test library. The tests in these
libraries are then bundled into a single executable.

The test executable can be run with `ctest`. Even though the tests
reside in a single executable, they are still exposed as individual
tests to `ctest`, and thus can be selected via its `-R` argument.

Not yet ported tests still build & run as before.

The following rules apply:

- Test code should reside in the same directory as the code under test.
- Tests that target functionality in `somefile.{c,cc}` should reside in
  `somefile_test.cc`.
- The namespace for tests is the `tests` sub-namespace of the code under
  test. For example, tests for `blender::bke` should be in
  `blender::bke:tests`.
- The test files should be listed in the module's `CMakeLists.txt` in a
  `blender_add_test_lib()` call. See the `blenkernel` module for an
  example.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D7649

7 files changed, 96 insertions, 353 deletions

diff --git a/tests/gtests/CMakeLists.txt b/tests/gtests/CMakeLists.txt
index 0dfe041974e..4ce68a6f4c0 100644
--- a/tests/gtests/CMakeLists.txt
+++ b/tests/gtests/CMakeLists.txt
@@ -1,18 +1,13 @@
 
-# GTest
 if(WITH_GTESTS)
-
-  include(GTestTesting)
-
-  add_definitions(${GFLAGS_DEFINES})
-  add_definitions(${GLOG_DEFINES})
-  add_definitions(-DBLENDER_GFLAGS_NAMESPACE=${GFLAGS_NAMESPACE})
-
   # Otherwise we get warnings here that we cant fix in external projects
   remove_strict_flags()
 
+  # Build common test runner
+  add_subdirectory(runner)
+
+  # Build tests not yet ported to the common runner
   add_subdirectory(testing)
-  add_subdirectory(blenkernel)
   add_subdirectory(blenlib)
   add_subdirectory(blenloader)
   add_subdirectory(guardedalloc)
diff --git a/tests/gtests/blenkernel/BKE_armature_test.cc b/tests/gtests/blenkernel/BKE_armature_test.cc
deleted file mode 100644
index ed6045081d4..00000000000
--- a/tests/gtests/blenkernel/BKE_armature_test.cc
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- * The Original Code is Copyright (C) 2020 Blender Foundation
- * All rights reserved.
- */
-
-#include "BKE_armature.h"
-
-#include "BLI_math.h"
-
-#include "testing/testing.h"
-
-static const float FLOAT_EPSILON = 1.2e-7;
-
-TEST(mat3_vec_to_roll, UnitMatrix)
-{
-  float unit_matrix[3][3];
-  float roll;
-
-  unit_m3(unit_matrix);
-
-  // Any vector with a unit matrix should return zero roll.
-  mat3_vec_to_roll(unit_matrix, unit_matrix[0], &roll);
-  EXPECT_FLOAT_EQ(0.0f, roll);
-
-  mat3_vec_to_roll(unit_matrix, unit_matrix[1], &roll);
-  EXPECT_FLOAT_EQ(0.0f, roll);
-
-  mat3_vec_to_roll(unit_matrix, unit_matrix[2], &roll);
-  EXPECT_FLOAT_EQ(0.0f, roll);
-
-  {
-    // Non-unit vector.
-    float vector[3] = {1.0f, 1.0f, 1.0f};
-    mat3_vec_to_roll(unit_matrix, vector, &roll);
-    EXPECT_NEAR(0.0f, roll, FLOAT_EPSILON);
-
-    // Normalized version of the above vector.
-    normalize_v3(vector);
-    mat3_vec_to_roll(unit_matrix, vector, &roll);
-    EXPECT_NEAR(0.0f, roll, FLOAT_EPSILON);
-  }
-}
-
-TEST(mat3_vec_to_roll, Rotationmatrix)
-{
-  float rotation_matrix[3][3];
-  float roll;
-
-  const float rot_around_x[3] = {1.234f, 0.0f, 0.0f};
-  eul_to_mat3(rotation_matrix, rot_around_x);
-
-  {
-    const float unit_axis_x[3] = {1.0f, 0.0f, 0.0f};
-    mat3_vec_to_roll(rotation_matrix, unit_axis_x, &roll);
-    EXPECT_NEAR(1.234f, roll, FLOAT_EPSILON);
-  }
-
-  {
-    const float unit_axis_y[3] = {0.0f, 1.0f, 0.0f};
-    mat3_vec_to_roll(rotation_matrix, unit_axis_y, &roll);
-    EXPECT_NEAR(0, roll, FLOAT_EPSILON);
-  }
-
-  {
-    const float unit_axis_z[3] = {0.0f, 0.0f, 1.0f};
-    mat3_vec_to_roll(rotation_matrix, unit_axis_z, &roll);
-    EXPECT_NEAR(0, roll, FLOAT_EPSILON);
-  }
-
-  {
-    const float between_x_and_y[3] = {1.0f, 1.0f, 0.0f};
-    mat3_vec_to_roll(rotation_matrix, between_x_and_y, &roll);
-    EXPECT_NEAR(0.57158958f, roll, FLOAT_EPSILON);
-  }
-}
diff --git a/tests/gtests/blenkernel/BKE_fcurve_test.cc b/tests/gtests/blenkernel/BKE_fcurve_test.cc
deleted file mode 100644
index e994dd43af9..00000000000
--- a/tests/gtests/blenkernel/BKE_fcurve_test.cc
+++ /dev/null
@@ -1,211 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- * The Original Code is Copyright (C) 2020 by Blender Foundation.
- */
-#include "testing/testing.h"
-
-#include "MEM_guardedalloc.h"
-
-extern "C" {
-#include "BKE_fcurve.h"
-
-#include "ED_keyframing.h"
-
-#include "DNA_anim_types.h"
-}
-
-// Epsilon for floating point comparisons.
-static const float EPSILON = 1e-7f;
-
-TEST(evaluate_fcurve, EmptyFCurve)
-{
-  FCurve *fcu = BKE_fcurve_create();
-  EXPECT_EQ(evaluate_fcurve(fcu, 47.0f), 0.0f);
-  BKE_fcurve_free(fcu);
-}
-
-TEST(evaluate_fcurve, OnKeys)
-{
-  FCurve *fcu = BKE_fcurve_create();
-
-  insert_vert_fcurve(fcu, 1.0f, 7.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF);
-  insert_vert_fcurve(fcu, 2.0f, 13.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF);
-  insert_vert_fcurve(fcu, 3.0f, 19.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF);
-
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.0f), 7.0f, EPSILON);   // hits 'on or before first' function
-  EXPECT_NEAR(evaluate_fcurve(fcu, 2.0f), 13.0f, EPSILON);  // hits 'between' function
-  EXPECT_NEAR(evaluate_fcurve(fcu, 3.0f), 19.0f, EPSILON);  // hits 'on or after last' function
-
-  /* Also test within a specific time epsilon of the keys, as this was an issue in T39207.
-   * This epsilon is just slightly smaller than the epsilon given to binarysearch_bezt_index_ex()
-   * in fcurve_eval_between_keyframes(), so it should hit the "exact" code path. */
-  float time_epsilon = 0.00008f;
-  EXPECT_NEAR(evaluate_fcurve(fcu, 2.0f - time_epsilon), 13.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 2.0f + time_epsilon), 13.0f, EPSILON);
-
-  BKE_fcurve_free(fcu);
-}
-
-TEST(evaluate_fcurve, InterpolationConstant)
-{
-  FCurve *fcu = BKE_fcurve_create();
-
-  EXPECT_EQ(insert_vert_fcurve(fcu, 1.0f, 7.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 0);
-  EXPECT_EQ(insert_vert_fcurve(fcu, 2.0f, 13.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 1);
-
-  fcu->bezt[0].ipo = BEZT_IPO_CONST;
-  fcu->bezt[1].ipo = BEZT_IPO_CONST;
-
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.25f), 7.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.50f), 7.0f, EPSILON);
-
-  BKE_fcurve_free(fcu);
-}
-
-TEST(evaluate_fcurve, InterpolationLinear)
-{
-  FCurve *fcu = BKE_fcurve_create();
-
-  EXPECT_EQ(insert_vert_fcurve(fcu, 1.0f, 7.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 0);
-  EXPECT_EQ(insert_vert_fcurve(fcu, 2.0f, 13.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 1);
-
-  fcu->bezt[0].ipo = BEZT_IPO_LIN;
-  fcu->bezt[1].ipo = BEZT_IPO_LIN;
-
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.25f), 8.5f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.50f), 10.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.75f), 11.5f, EPSILON);
-
-  BKE_fcurve_free(fcu);
-}
-
-TEST(evaluate_fcurve, InterpolationBezier)
-{
-  FCurve *fcu = BKE_fcurve_create();
-
-  EXPECT_EQ(insert_vert_fcurve(fcu, 1.0f, 7.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 0);
-  EXPECT_EQ(insert_vert_fcurve(fcu, 2.0f, 13.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 1);
-
-  EXPECT_EQ(fcu->bezt[0].ipo, BEZT_IPO_BEZ);
-  EXPECT_EQ(fcu->bezt[1].ipo, BEZT_IPO_BEZ);
-
-  // Test with default handles.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.25f), 7.8297067f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.50f), 10.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.75f), 12.170294f, EPSILON);
-
-  // Test with modified handles.
-  fcu->bezt[0].vec[0][0] = 0.71855f;  // left handle X
-  fcu->bezt[0].vec[0][1] = 6.22482f;  // left handle Y
-  fcu->bezt[0].vec[2][0] = 1.35148f;  // right handle X
-  fcu->bezt[0].vec[2][1] = 7.96806f;  // right handle Y
-
-  fcu->bezt[1].vec[0][0] = 1.66667f;  // left handle X
-  fcu->bezt[1].vec[0][1] = 10.4136f;  // left handle Y
-  fcu->bezt[1].vec[2][0] = 2.33333f;  // right handle X
-  fcu->bezt[1].vec[2][1] = 15.5864f;  // right handle Y
-
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.25f), 7.945497f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.50f), 9.3495407f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.75f), 11.088551f, EPSILON);
-
-  BKE_fcurve_free(fcu);
-}
-
-TEST(evaluate_fcurve, InterpolationBounce)
-{
-  FCurve *fcu = BKE_fcurve_create();
-
-  EXPECT_EQ(insert_vert_fcurve(fcu, 1.0f, 7.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 0);
-  EXPECT_EQ(insert_vert_fcurve(fcu, 2.0f, 13.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 1);
-
-  fcu->bezt[0].ipo = BEZT_IPO_BOUNCE;
-  fcu->bezt[1].ipo = BEZT_IPO_BOUNCE;
-
-  fcu->bezt[0].easing = BEZT_IPO_EASE_IN;
-  fcu->bezt[1].easing = BEZT_IPO_EASE_AUTO;
-
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.4f), 8.3649998f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.5f), 8.4062500f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 1.8f), 11.184999f, EPSILON);
-
-  BKE_fcurve_free(fcu);
-}
-
-TEST(evaluate_fcurve, ExtrapolationLinearKeys)
-{
-  FCurve *fcu = BKE_fcurve_create();
-
-  EXPECT_EQ(insert_vert_fcurve(fcu, 1.0f, 7.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 0);
-  EXPECT_EQ(insert_vert_fcurve(fcu, 2.0f, 13.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 1);
-  fcu->bezt[0].ipo = BEZT_IPO_LIN;
-  fcu->bezt[1].ipo = BEZT_IPO_LIN;
-
-  fcu->extend = FCURVE_EXTRAPOLATE_LINEAR;
-  // Before first keyframe.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 0.75f), 5.5f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 0.50f), 4.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, -1.50f), -8.0f, EPSILON);
-  // After last keyframe.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 2.75f), 17.5f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 3.50f), 22.0f, EPSILON);
-
-  fcu->extend = FCURVE_EXTRAPOLATE_CONSTANT;
-  // Before first keyframe.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 0.75f), 7.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, -1.50f), 7.0f, EPSILON);
-  // After last keyframe.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 2.75f), 13.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 3.50f), 13.0f, EPSILON);
-
-  BKE_fcurve_free(fcu);
-}
-
-TEST(evaluate_fcurve, ExtrapolationBezierKeys)
-{
-  FCurve *fcu = BKE_fcurve_create();
-
-  EXPECT_EQ(insert_vert_fcurve(fcu, 1.0f, 7.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 0);
-  EXPECT_EQ(insert_vert_fcurve(fcu, 2.0f, 13.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_NO_USERPREF), 1);
-
-  fcu->bezt[0].vec[0][0] = 0.71855f;  // left handle X
-  fcu->bezt[0].vec[0][1] = 6.22482f;  // left handle Y
-  fcu->bezt[0].vec[2][0] = 1.35148f;  // right handle X
-  fcu->bezt[0].vec[2][1] = 7.96806f;  // right handle Y
-
-  fcu->bezt[1].vec[0][0] = 1.66667f;  // left handle X
-  fcu->bezt[1].vec[0][1] = 10.4136f;  // left handle Y
-  fcu->bezt[1].vec[2][0] = 2.33333f;  // right handle X
-  fcu->bezt[1].vec[2][1] = 15.5864f;  // right handle Y
-
-  fcu->extend = FCURVE_EXTRAPOLATE_LINEAR;
-  // Before first keyframe.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 0.75f), 6.3114409f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, -0.50f), 2.8686447f, EPSILON);
-  // After last keyframe.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 2.75f), 18.81946f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 3.50f), 24.63892f, EPSILON);
-
-  fcu->extend = FCURVE_EXTRAPOLATE_CONSTANT;
-  // Before first keyframe.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 0.75f), 7.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, -1.50f), 7.0f, EPSILON);
-  // After last keyframe.
-  EXPECT_NEAR(evaluate_fcurve(fcu, 2.75f), 13.0f, EPSILON);
-  EXPECT_NEAR(evaluate_fcurve(fcu, 3.50f), 13.0f, EPSILON);
-
-  BKE_fcurve_free(fcu);
-}
diff --git a/tests/gtests/blenkernel/CMakeLists.txt b/tests/gtests/blenkernel/CMakeLists.txt
deleted file mode 100644
index 5cf4c7a27af..00000000000
--- a/tests/gtests/blenkernel/CMakeLists.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-# ***** BEGIN GPL LICENSE BLOCK *****
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software Foundation,
-# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# The Original Code is Copyright (C) 2020, Blender Foundation
-# All rights reserved.
-# ***** END GPL LICENSE BLOCK *****
-
-set(INC
-  .
-  ..
-  ../../../source/blender/blenkernel
-  ../../../source/blender/blenlib
-  ../../../source/blender/editors/include
-  ../../../source/blender/makesdna
-  ../../../source/blender/makesrna
-  ../../../intern/guardedalloc
-  ../../../intern/atomic
-)
-
-setup_libdirs()
-include_directories(${INC})
-
-set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${PLATFORM_LINKFLAGS}")
-set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} ${PLATFORM_LINKFLAGS_DEBUG}")
-
-if(WITH_BUILDINFO)
-  set(BUILDINFO buildinfoobj)
-endif()
-
-BLENDER_TEST(BKE_armature "bf_blenloader;bf_blenkernel;bf_blenlib;${BUILDINFO}")
-BLENDER_TEST(BKE_fcurve "bf_blenloader;bf_blenkernel;bf_editor_animation;${BUILDINFO}")
diff --git a/tests/gtests/runner/CMakeLists.txt b/tests/gtests/runner/CMakeLists.txt
new file mode 100644
index 00000000000..e7cbabfe7c6
--- /dev/null
+++ b/tests/gtests/runner/CMakeLists.txt
@@ -0,0 +1,63 @@
+# ***** BEGIN GPL LICENSE BLOCK *****
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# The Original Code is Copyright (C) 2020, Blender Foundation
+# All rights reserved.
+# ***** END GPL LICENSE BLOCK *****
+
+# Build the test runner. This runner takes care of running all GTests, i.e.
+# the code that was built using the blender_add_test_lib() CMake macro (see
+# macros.cmake).
+set(SRC
+  blender_test.cc
+)
+
+if(WITH_BUILDINFO)
+  list(APPEND SRC
+    "$<TARGET_OBJECTS:buildinfoobj>"
+  )
+endif()
+
+
+# Test libraries need to be linked "whole archive", because they're not
+# directly referenced from other code.
+get_property(_test_libs GLOBAL PROPERTY BLENDER_TEST_LIBS)
+if(WIN32)
+  list(APPEND TEST_LIBS ${_test_libs})
+elseif(APPLE)
+  list(APPEND TEST_LIBS "-Wl,-force_load" ${_test_libs})
+elseif(UNIX)
+  list(APPEND TEST_LIBS "-Wl,--whole-archive" ${_test_libs} "-Wl,--no-whole-archive")
+else()
+  message(FATAL_ERROR "Unknown how to link whole-archive with your compiler ${CMAKE_CXX_COMPILER_ID}")
+endif()
+unset(_test_libs)
+
+# This builds `bin/tests/blender_test`, but does not add it as a single test.
+setup_libdirs()
+BLENDER_SRC_GTEST_EX(
+  NAME blender
+  SRC "${SRC}"
+  EXTRA_LIBS "${TEST_LIBS}"
+  SKIP_ADD_TEST
+)
+setup_liblinks(blender_test)
+
+# This runs the blender_test executable with `--gtest_list_tests`, then
+# exposes those tests individually to the ctest runner.
+# See https://cmake.org/cmake/help/v3.18/module/GoogleTest.html
+include(GoogleTest)
+gtest_discover_tests(blender_test)
diff --git a/tests/gtests/runner/blender_test.cc b/tests/gtests/runner/blender_test.cc
new file mode 100644
index 00000000000..fbce7a4283f
--- /dev/null
+++ b/tests/gtests/runner/blender_test.cc
@@ -0,0 +1,25 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation.
+ * All rights reserved.
+ */
+
+/* This file is intentionally left blank. It is necessary for CMake to have a source file for each
+ * executable. However, the blender_tests test runner only comprises of statically linked library
+ * files, including its main function.
+ *
+ * See source/blender/blenkernel/CMakeLists.txt for an example of how to add unit tests to the test
+ * runner. */
diff --git a/tests/gtests/testing/CMakeLists.txt b/tests/gtests/testing/CMakeLists.txt
index e08ee486933..c8a7f487c5d 100644
--- a/tests/gtests/testing/CMakeLists.txt
+++ b/tests/gtests/testing/CMakeLists.txt
@@ -18,6 +18,10 @@
 # All rights reserved.
 # ***** END GPL LICENSE BLOCK *****
 
+add_definitions(${GFLAGS_DEFINES})
+add_definitions(${GLOG_DEFINES})
+add_definitions(-DBLENDER_GFLAGS_NAMESPACE=${GFLAGS_NAMESPACE})
+
 set(INC
   .
   ..