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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "blimp/net/delta_encoding.h" | |
6 | |
7 #include <string> | |
8 #include <vector> | |
9 | |
10 #include "base/logging.h" | |
11 #include "base/macros.h" | |
12 #include "testing/gmock/include/gmock/gmock.h" | |
13 #include "testing/gtest/include/gtest/gtest.h" | |
14 | |
15 using testing::ElementsAre; | |
16 | |
17 namespace blimp { | |
18 namespace { | |
19 | |
20 // Provides an example of field elision across structs. | |
21 // For each CompoundStruct element in a sequence: | |
22 // |str| overrides the previous element's |str|, if set. | |
23 // |str| inherits the previous element's |str|, if empty. | |
24 // |number| is computed as a delta from the previous element's |number|. | |
25 struct CompoundStruct { | |
26 static CompoundStruct Difference(const CompoundStruct& lhs, | |
27 const CompoundStruct& rhs) { | |
28 CompoundStruct output; | |
29 output.number = lhs.number - rhs.number; | |
30 if (lhs.str != rhs.str) { | |
31 output.str = lhs.str; | |
32 } | |
33 return output; | |
34 } | |
35 | |
36 static CompoundStruct Merge(const CompoundStruct& lhs, | |
37 const CompoundStruct& rhs) { | |
38 CompoundStruct output; | |
39 output.number = lhs.number + rhs.number; | |
40 output.str = (rhs.str.empty() ? lhs.str : rhs.str); | |
41 return output; | |
42 } | |
43 | |
44 // Sortable by |number|. | |
45 friend bool operator<(const CompoundStruct& lhs, const CompoundStruct& rhs) { | |
46 return lhs.number < rhs.number; | |
47 } | |
48 | |
49 int number; | |
50 std::string str; | |
51 }; | |
52 | |
53 class TestDeltaEncoding : public testing::Test { | |
54 public: | |
55 TestDeltaEncoding() {} | |
56 | |
57 private: | |
58 DISALLOW_COPY_AND_ASSIGN(TestDeltaEncoding); | |
59 }; | |
60 | |
61 TEST_F(TestDeltaEncoding, DeltaEncode) { | |
62 std::vector<int> test{5, 1, 3}; | |
63 DeltaEncode(test.begin(), test.end()); | |
64 EXPECT_THAT(test, ElementsAre(5, -4, 2)); | |
65 } | |
66 | |
67 TEST_F(TestDeltaEncoding, DeltaEncodeEmpty) { | |
68 std::vector<int> test; | |
69 DeltaEncode(test.begin(), test.end()); | |
70 EXPECT_TRUE(test.empty()); | |
71 } | |
72 | |
73 TEST_F(TestDeltaEncoding, DeltaEncodeSingleValue) { | |
74 std::vector<int> test; | |
75 test.push_back(1); | |
76 DeltaEncode(test.begin(), test.end()); | |
77 EXPECT_THAT(test, ElementsAre(1)); | |
78 } | |
79 | |
80 TEST_F(TestDeltaEncoding, DeltaDecode) { | |
81 std::vector<int> test{1, 1, 2}; | |
82 DeltaDecode(test.begin(), test.end()); | |
83 EXPECT_THAT(test, ElementsAre(1, 2, 4)); | |
84 } | |
85 | |
86 TEST_F(TestDeltaEncoding, DeltaDecodeEmpty) { | |
87 std::vector<int> test; | |
88 DeltaDecode(test.begin(), test.end()); | |
89 EXPECT_TRUE(test.empty()); | |
90 } | |
91 | |
92 TEST_F(TestDeltaEncoding, DeltaDecodeSingleValue) { | |
93 std::vector<int> test{1}; | |
94 DeltaEncode(test.begin(), test.end()); | |
95 EXPECT_THAT(test, ElementsAre(1)); | |
96 } | |
97 | |
98 TEST_F(TestDeltaEncoding, SortAndDeltaEncodeRoundTrip) { | |
99 std::vector<int> test{8, 3, 5}; | |
100 SortAndDeltaEncode(test.begin(), test.end()); | |
101 EXPECT_THAT(test, ElementsAre(3, 2, 3)); | |
102 DeltaDecode(test.begin(), test.end()); | |
103 EXPECT_THAT(test, ElementsAre(3, 5, 8)); | |
104 } | |
105 | |
106 TEST_F(TestDeltaEncoding, DeltaEncodeStruct) { | |
107 std::vector<CompoundStruct> test{{2, "foo"}, {3, "foo"}, {0, "bar"}}; | |
108 DeltaEncode(test.begin(), test.end(), &CompoundStruct::Difference); | |
109 | |
110 EXPECT_EQ(2, test[0].number); | |
111 EXPECT_EQ(1, test[1].number); | |
112 EXPECT_EQ(-3, test[2].number); | |
113 | |
114 EXPECT_EQ("foo", test[0].str); | |
115 EXPECT_EQ("", test[1].str); | |
116 EXPECT_EQ("bar", test[2].str); | |
117 } | |
118 | |
119 TEST_F(TestDeltaEncoding, DeltaDecodeStruct) { | |
120 std::vector<CompoundStruct> test{{2, "foo"}, {-1, ""}, {0, "bar"}}; | |
121 DeltaDecode(test.begin(), test.end(), &CompoundStruct::Merge); | |
122 | |
123 EXPECT_EQ(2, test[0].number); | |
124 EXPECT_EQ(1, test[1].number); | |
125 EXPECT_EQ(1, test[2].number); | |
126 | |
127 EXPECT_EQ("foo", test[0].str); | |
128 EXPECT_EQ("foo", test[1].str); | |
129 EXPECT_EQ("bar", test[2].str); | |
130 } | |
131 | |
132 TEST_F(TestDeltaEncoding, SortAndDeltaEncodeStructRoundTrip) { | |
133 std::vector<CompoundStruct> test{{2, "foo"}, {3, "foo"}, {0, "bar"}}; | |
134 SortAndDeltaEncode(test.begin(), test.end(), &CompoundStruct::Difference); | |
135 | |
136 EXPECT_EQ(0, test[0].number); | |
137 EXPECT_EQ(2, test[1].number); | |
138 EXPECT_EQ(1, test[2].number); | |
139 | |
140 EXPECT_EQ("bar", test[0].str); | |
141 EXPECT_EQ("foo", test[1].str); | |
142 EXPECT_EQ("", test[2].str); | |
143 | |
144 DeltaDecode(test.begin(), test.end(), &CompoundStruct::Merge); | |
145 EXPECT_EQ(0, test[0].number); | |
146 EXPECT_EQ(2, test[1].number); | |
147 EXPECT_EQ(3, test[2].number); | |
148 | |
149 EXPECT_EQ("bar", test[0].str); | |
150 EXPECT_EQ("foo", test[1].str); | |
151 EXPECT_EQ("foo", test[2].str); | |
152 } | |
153 | |
154 } // namespace | |
155 } // namespace blimp | |
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