From 56aa5b0d8c6b66369f979e8bee4f1bd99454a99f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sybren=20A=2E=20St=C3=BCvel?= <sybren@blender.org>
Date: Thu, 16 Jul 2020 12:58:49 +0200
Subject: 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
---
 source/blender/blenkernel/intern/armature_test.cc | 93 +++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 source/blender/blenkernel/intern/armature_test.cc

(limited to 'source/blender/blenkernel/intern/armature_test.cc')

diff --git a/source/blender/blenkernel/intern/armature_test.cc b/source/blender/blenkernel/intern/armature_test.cc
new file mode 100644
index 00000000000..cf17c37bc69
--- /dev/null
+++ b/source/blender/blenkernel/intern/armature_test.cc
@@ -0,0 +1,93 @@
+/*
+ * 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"
+
+namespace blender::bke::tests {
+
+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);
+  }
+}
+
+}  // namespace blender::bke::tests
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