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Diffstat (limited to 'test/math_util.c')
-rw-r--r-- | test/math_util.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/test/math_util.c b/test/math_util.c new file mode 100644 index 0000000000..bfc0345655 --- /dev/null +++ b/test/math_util.c @@ -0,0 +1,60 @@ +/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * Test motion sense code. + */ + +#include <math.h> + +#include "math_util.h" +#include "motion_sense.h" +#include "test_util.h" + +/*****************************************************************************/ +/* Mock functions */ + +/* Need to define accelerometer init and read functions just to compile. */ +int accel_init(enum accel_id id) +{ + return EC_SUCCESS; +} + +int accel_read(enum accel_id id, int *x_acc, int *y_acc, int *z_acc) +{ + return EC_SUCCESS; +} + +/*****************************************************************************/ +/* Test utilities */ + +/* Macro to compare two floats and check if they are equal within diff. */ +#define IS_FLOAT_EQUAL(a, b, diff) ((a) >= ((b) - diff) && (a) <= ((b) + diff)) + +#define ACOS_TOLERANCE_DEG 0.5f +#define RAD_TO_DEG (180.0f / 3.1415926f) + +static int test_acos(void) +{ + float a, b; + float test; + + /* Test a handful of values. */ + for (test = -1.0; test <= 1.0; test += 0.01) { + a = arc_cos(test); + b = acos(test) * RAD_TO_DEG; + TEST_ASSERT(IS_FLOAT_EQUAL(a, b, ACOS_TOLERANCE_DEG)); + } + + return EC_SUCCESS; +} + + +void run_test(void) +{ + test_reset(); + + RUN_TEST(test_acos); + + test_print_result(); +} |