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[slidingtile] / sliding_tile_lib_test.cc
1 #include "sliding_tile_lib.h"
2
3 #include "gtest/gtest.h"
4 #include "gmock/gmock.h"
5 #include <vector>
6 #include <sstream>
7
8 using testing::Field;
9 using testing::ElementsAreArray;
10
11 TEST(Step, Adjacency) {
12 const signed char LEFT = -1;
13 const signed char RIGHT = +1;
14 const signed char UP = -BOARD_DIM;
15 const signed char DOWN = +BOARD_DIM;
16 for (int i = 0; i < BOARD_SIZE; i++) {
17 SCOPED_TRACE(i);
18 std::vector<signed char> expected;
19 if (i >= BOARD_DIM) {
20 expected.push_back(i + UP);
21 }
22 if (i < BOARD_SIZE - BOARD_DIM) {
23 expected.push_back(i + DOWN);
24 }
25 if (i % BOARD_DIM != 0) {
26 expected.push_back(i + LEFT);
27 }
28 if (i % BOARD_DIM != BOARD_DIM - 1) {
29 expected.push_back(i + RIGHT);
30 }
31
32 std::vector<signed char> actual;
33 for (int j = 0; Step::adjacent[i][j] >= 0; j++) {
34 actual.push_back(Step::adjacent[i][j]);
35 }
36 EXPECT_THAT(actual, testing::UnorderedElementsAreArray(expected));
37 }
38 }
39
40 TEST(Board, GoodInput) {
41 std::istringstream is{"15,14,9,13,3,1,12,8,0,11,6,4,7,5,2,10"};
42 Board b;
43 is >> b;
44 EXPECT_FALSE(is.fail());
45 EXPECT_TRUE(is.eof());
46 EXPECT_THAT(b.board, ElementsAreArray({15,14,9,13,3,1,12,8,0,11,6,4,7,5,2,10}));
47 }
48
49 TEST(Board, ShortInput) {
50 std::istringstream is{"15,14,9,13,3,1,12,8,0,11,6,4,7,5,2"};
51 Board b;
52 is >> b;
53 EXPECT_TRUE(is.fail());
54 }
55
56 TEST(Board, NonNumericInput) {
57 std::istringstream is{"15,14,foo,13,3,1,12,8,0,11,6,4,7,5,2,10"};
58 Board b;
59 is >> b;
60 EXPECT_TRUE(is.fail());
61 }
62
63 TEST(Board, RepeatedTileInput) {
64 std::istringstream is{"15,15,9,13,3,1,12,8,0,11,6,4,7,5,2,10"};
65 Board b;
66 is >> b;
67 EXPECT_TRUE(is.fail());
68 }
69
70 TEST(Board, LowTileInput) {
71 std::istringstream is{"-1,14,9,13,3,1,12,8,0,11,6,4,7,5,2,10"};
72 Board b;
73 is >> b;
74 EXPECT_TRUE(is.fail());
75 }
76
77 TEST(Board, HighTileInput) {
78 std::istringstream is{"16,14,9,13,3,1,12,8,0,11,6,4,7,5,2,10"};
79 Board b;
80 is >> b;
81 EXPECT_TRUE(is.fail());
82 }
83
84 TEST(Board, Hole) {
85 Board b{{16,14,9,13,3,1,12,8,0,11,6,4,7,5,2,10}};
86 EXPECT_EQ(8, b.hole());
87 }
88
89 TEST(Board, NoHole) {
90 Board b{{16,14,9,13,3,1,12,8,16,11,6,4,7,5,2,10}};
91 EXPECT_THROW(b.hole(), std::runtime_error);
92 }
93
94 TEST(Board, ZeroDistance) {
95 Board b{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}};
96 EXPECT_EQ(0, b.distance(b));
97 }
98
99 TEST(Board, DistanceAdjacentTilesFlipped) {
100 Board b1{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}};
101 Board b2{{2,1,3,4,5,6,7,8,9,10,11,12,13,14,15,0}};
102 EXPECT_EQ(2, b1.distance(b2));
103 }
104
105 TEST(Board, DistanceOneMoveRemaining) {
106 Board b1{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}};
107 Board b2{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,0,15}};
108 EXPECT_EQ(2, b1.distance(b2));
109 }
110
111 TEST(Board, DistanceCornersSwapped) {
112 Board b1{{0,2,3,13,5,6,7,8,9,10,11,12,4,14,15,1}};
113 Board b2{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}};
114 EXPECT_EQ(24, b1.distance(b2));
115 }
116
117 TEST(Board, MaxDistance) {
118 Board b1{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}};
119 Board b2{{0,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1}};
120 EXPECT_EQ(64, b1.distance(b2));
121 }
122
123 TEST(Step, TwoSuccessors) {
124 auto s = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}}, nullptr});
125 std::vector<Step*> suc = s->successors(s);
126 EXPECT_THAT(suc, testing::UnorderedElementsAre(
127 Field(&Step::board, Field(&Board::board, ElementsAreArray({1,2,3,4,5,6,7,8,9,10,11,12,13,14,0,15}))),
128 Field(&Step::board, Field(&Board::board, ElementsAreArray({1,2,3,4,5,6,7,8,9,10,11,0,13,14,15,12})))));
129 }
130
131 TEST(Step, FourSuccessors) {
132 auto s = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,0,6,7,8,9,10,11,12,13,14,15}}, nullptr});
133 std::vector<Step*> suc = s->successors(s);
134 EXPECT_THAT(suc, testing::UnorderedElementsAre(
135 Field(&Step::board, Field(&Board::board, ElementsAreArray({1,2,3,4,0,5,6,7,8,9,10,11,12,13,14,15}))),
136 Field(&Step::board, Field(&Board::board, ElementsAreArray({1,2,3,4,5,6,0,7,8,9,10,11,12,13,14,15}))),
137 Field(&Step::board, Field(&Board::board, ElementsAreArray({1,0,3,4,5,2,6,7,8,9,10,11,12,13,14,15}))),
138 Field(&Step::board, Field(&Board::board, ElementsAreArray({1,2,3,4,5,9,6,7,8,0,10,11,12,13,14,15})))));
139 }
140
141 TEST(Step, Output) {
142 auto s1 = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,7,11,8,9,6,0,12,13,10,14,15}}, nullptr});
143 auto s2 = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,7,0,8,9,6,11,12,13,10,14,15}}, s1});
144 auto s3 = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,0,7,8,9,6,11,12,13,10,14,15}}, s2});
145 auto s4 = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,6,7,8,9,0,11,12,13,10,14,15}}, s3});
146 auto s5 = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,6,7,8,9,10,11,12,13,0,14,15}}, s4});
147 auto s6 = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,0,15}}, s5});
148 auto s7 = std::shared_ptr<Step>(new Step{{{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}}, s6});
149 std::ostringstream actual;
150 actual << *s7;
151 std::ostringstream expected;
152 expected << "11 down" << std::endl
153 << "7 right" << std::endl
154 << "6 up" << std::endl
155 << "10 up" << std::endl
156 << "14 left" << std::endl
157 << "15 left" << std::endl;
158 EXPECT_EQ(expected.str(), actual.str());
159 }