Motown: Rename Ratio and LinearFunction classes

services/media/common/test/ratio_test.cc

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <limits>
-
-#include "mojo/services/media/common/cpp/ratio.h"
-#include "services/media/common/test/test_base.h"
-
-namespace mojo {
-namespace media {
-namespace {
-
-class RatioTest : public TestBase {
-  static uint32_t gcd(uint32_t a, uint32_t b) {
-    while (b != 0) {
-      uint32_t t = a;
-      a = b;
-      b = t % b;
-    }
-    return a;
-  }
-
- public:
-  // Verifies Ratio::Reduce and the constructor, ensuring that the ratio
-  // numerator * common_factor / denominator * common_factor is reduced to
-  // numerator / denominator. numerator and denominator need to be relatively
-  // prime for this to work.
-  void VerifyReduce(uint32_t numerator,
-                    uint32_t denominator,
-                    uint32_t common_factor) {
-    // Make sure numerator and denominator are relatively prime.
-    EXPECT_EQ(1u, gcd(numerator, denominator));
-
-    uint32_t test_numerator = numerator * common_factor;
-    uint32_t test_denominator = denominator * common_factor;
-
-    // Make sure the constructor reduces.
-    Ratio ratio(test_numerator, test_denominator);
-    EXPECT_EQ(numerator, ratio.numerator());
-    EXPECT_EQ(denominator, ratio.denominator());
-
-    // Test the static method.
-    Ratio::Reduce(&test_numerator, &test_denominator);
-    EXPECT_EQ(numerator, test_numerator);
-    EXPECT_EQ(denominator, test_denominator);
-  }
-
-  // Verifies the Ratio::Scale methods by scaling value by numerator /
-  // denominator and verifying the result.
-  void VerifyScale(int64_t value,
-                   uint32_t numerator,
-                   uint32_t denominator,
-                   int64_t result) {
-    // Test the instance method.
-    EXPECT_EQ(result, Ratio(numerator, denominator).Scale(value));
-
-    // Test the static method.
-    EXPECT_EQ(result, Ratio::Scale(value, numerator, denominator));
-
-    // Test the operators.
-    EXPECT_EQ(result, value * Ratio(numerator, denominator));
-    EXPECT_EQ(result, Ratio(numerator, denominator) * value);
-    if (numerator != 0) {
-      EXPECT_EQ(result, value / Ratio(denominator, numerator));
-    }
-  }
-
-  // Verifies the Ratio::Product methods by multiplying the given a and b
-  // ratios and checking the result against the expected ratio.
-  void VerifyProduct(uint32_t a_numerator,
-                     uint32_t a_denominator,
-                     uint32_t b_numerator,
-                     uint32_t b_denominator,
-                     uint32_t expected_numerator,
-                     uint32_t expected_denominator,
-                     bool exact) {
-    // Test the first static method.
-    uint32_t actual_numerator;
-    uint32_t actual_denominator;
-    Ratio::Product(a_numerator, a_denominator, b_numerator, b_denominator,
-                   &actual_numerator, &actual_denominator, exact);
-    EXPECT_EQ(expected_numerator, actual_numerator);
-    EXPECT_EQ(expected_denominator, actual_denominator);
-
-    // Test the second static method.
-    EXPECT_EQ(Ratio(expected_numerator, expected_denominator),
-              Ratio::Product(Ratio(a_numerator, a_denominator),
-                             Ratio(b_numerator, b_denominator), exact));
-
-    // Test the operator
-    if (exact) {
-      EXPECT_EQ(Ratio(expected_numerator, expected_denominator),
-                Ratio(a_numerator, a_denominator) *
-                    Ratio(b_numerator, b_denominator));
-    }
-  }
-
-  // Verifies the Ration::Inverse method using the given ratio.
-  void VerifyInverse(uint32_t numerator, uint32_t denominator) {
-    Ratio ratio(numerator, denominator);
-    Ratio inverse(ratio.Inverse());
-    EXPECT_EQ(ratio.denominator(), inverse.numerator());
-    EXPECT_EQ(ratio.numerator(), inverse.denominator());
-  }
-};
-
-// Tests Ratio::Reduce and that the Ratio constructor reduces.
-TEST_F(RatioTest, Reduce) {
-  VerifyReduce(0, 1, 1);
-  VerifyReduce(1, 1, 1);
-  VerifyReduce(1234, 1, 1);
-  VerifyReduce(1, 1234, 14);
-  VerifyReduce(1, 1, 1234);
-  VerifyReduce(10, 1, 1234);
-  VerifyReduce(1, 10, 1234);
-  VerifyReduce(49, 81, 1);
-  VerifyReduce(49, 81, 10);
-  VerifyReduce(49, 81, 100);
-  VerifyReduce(1, 8, 65536);
-  VerifyReduce(8, 1, 65536);
-}
-
-// Tests Ratio::Scale, static, instance and operator versions.
-TEST_F(RatioTest, Scale) {
-  const int64_t int64_min = std::numeric_limits<int64_t>::min();
-  VerifyScale(0, 0, 1, 0);
-  VerifyScale(1, 0, 1, 0);
-  VerifyScale(0, 1, 1, 0);
-  VerifyScale(1, 1, 1, 1);
-  VerifyScale(1, 2, 1, 2);
-  VerifyScale(1, 1, 2, 0);
-  VerifyScale(-1, 1, 2, -1);
-  VerifyScale(1000, 1, 2, 500);
-  VerifyScale(1001, 1, 2, 500);
-  VerifyScale(-1000, 1, 2, -500);
-  VerifyScale(-1001, 1, 2, -501);
-  VerifyScale(1000, 2, 1, 2000);
-  VerifyScale(1001, 2, 1, 2002);
-  VerifyScale(-1000, 2, 1, -2000);
-  VerifyScale(-1001, 2, 1, -2002);
-  VerifyScale(1ll << 32, 1, 1, 1ll << 32);
-  VerifyScale(1ll << 32, 1, 2, 1ll << 31);
-  VerifyScale(1ll << 32, 2, 1, 1ll << 33);
-  VerifyScale(1234ll << 30, 1, 1, 1234ll << 30);
-  VerifyScale(1234ll << 30, 1, 2, 1234ll << 29);
-  VerifyScale(1234ll << 30, 2, 1, 1234ll << 31);
-  VerifyScale(1234ll << 30, 1 << 31, 1, Ratio::kOverflow);
-  VerifyScale(1234ll << 30, 1ll << 31, (1ll << 31) - 2,
-              (1234ll << 30) + 1234ll);
-  VerifyScale(int64_min, 1, 1, int64_min);
-  VerifyScale(int64_min, 1, 2, int64_min / 2);
-  VerifyScale(int64_min / 2, 2, 1, int64_min);
-  VerifyScale(int64_min, 1000001, 1000000, Ratio::kOverflow);
-}
-
-// Tests Ratio::Product, static and operator versions.
-TEST_F(RatioTest, Product) {
-  VerifyProduct(0, 1, 0, 1, 0, 1, true);
-  VerifyProduct(1, 1, 1, 1, 1, 1, true);
-  VerifyProduct(10, 1, 1, 10, 1, 1, true);
-  VerifyProduct(4321, 1234, 617, 4321, 1, 2, true);
-  VerifyProduct(1234, 4321, 4321, 617, 2, 1, true);
-  VerifyProduct(1ll << 31, (1ll << 31) - 1, (1ll << 31) - 1, 1ll << 31, 1, 1,
-                true);
-  VerifyProduct(1ll << 31, (1ll << 31) - 1, (1ll << 31) - 2, 1ll << 31,
-                0x7ffffffe, 0x7fffffff, false);
-}
-
-// Tests Ratio::Inverse.
-TEST_F(RatioTest, Inverse) {
-  VerifyInverse(1, 1);
-  VerifyInverse(2, 1);
-  VerifyInverse(1, 2);
-  VerifyInverse(1000000, 1234);
-  VerifyInverse(1234, 1000000);
-}
-
-}  // namespace
-}  // namespace media
-}  // namespace mojo