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https://github.com/m5stack/esphome.git
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Geoff
43c6b839cd
Co-authored-by: Clyde Stubbs <2366188+clydebarrow@users.noreply.github.com> Co-authored-by: J. Nick Koston <nick@home-assistant.io> Co-authored-by: J. Nick Koston <nick@koston.org> Co-authored-by: J. Nick Koston <nick+github@koston.org>
59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
#include <gtest/gtest.h>
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#include <cmath>
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#include "esphome/core/helpers.h"
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namespace esphome {
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TEST(HelpersTest, Ilog10PowersOfTen) {
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EXPECT_EQ(ilog10(1.0f), 0);
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EXPECT_EQ(ilog10(10.0f), 1);
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EXPECT_EQ(ilog10(100.0f), 2);
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EXPECT_EQ(ilog10(1000.0f), 3);
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EXPECT_EQ(ilog10(10000.0f), 4);
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EXPECT_EQ(ilog10(100000.0f), 5);
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EXPECT_EQ(ilog10(0.1f), -1);
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EXPECT_EQ(ilog10(0.001f), -3);
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}
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TEST(HelpersTest, Ilog10General) {
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EXPECT_EQ(ilog10(5.0f), 0);
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EXPECT_EQ(ilog10(9.99f), 0);
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EXPECT_EQ(ilog10(50.0f), 1);
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EXPECT_EQ(ilog10(99.0f), 1);
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EXPECT_EQ(ilog10(999.0f), 2);
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EXPECT_EQ(ilog10(0.5f), -1);
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EXPECT_EQ(ilog10(0.0072f), -3);
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EXPECT_EQ(ilog10(120000.0f), 5);
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EXPECT_EQ(ilog10(123456.789f), 5);
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}
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TEST(HelpersTest, Ilog10Negative) {
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EXPECT_EQ(ilog10(-1.0f), 0);
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EXPECT_EQ(ilog10(-10.0f), 1);
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EXPECT_EQ(ilog10(-0.1f), -1);
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EXPECT_EQ(ilog10(-123.456f), 2);
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}
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// Verify that ilog10 + pow10_int produces the same rounding result as log10/pow.
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// ilog10 may differ from floor(log10f()) for values not exactly representable in float
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// (e.g. 0.01f is 0.00999...), but the full round-trip must match.
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TEST(HelpersTest, Ilog10RoundTripMatchesLog10) {
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float values[] = {0.0072f, 0.05f, 0.1f, 0.5f, 1.0f, 3.14f, 9.99f, 10.0f, 42.0f, 100.0f,
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1234.5f, 9999.0f, 10000.0f, 99999.0f, 120000.0f, 999999.0f, -1.0f, -0.1f, -123.456f, -10000.0f};
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for (uint8_t digits = 1; digits <= 6; digits++) {
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for (float v : values) {
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// New implementation using ilog10 + pow10_int
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float factor_new = pow10_int(digits - 1 - ilog10(v));
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float result_new = roundf(v * factor_new) / factor_new;
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// Reference using log10/pow
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double factor_ref = pow(10.0, digits - std::ceil(std::log10(std::fabs(v))));
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float result_ref = static_cast<float>(round(v * factor_ref) / factor_ref);
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EXPECT_FLOAT_EQ(result_new, result_ref) << "mismatch for value=" << v << " digits=" << (int) digits;
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}
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}
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}
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} // namespace esphome
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