1  
 2  //              Copyright Catch2 Authors
 3  // Distributed under the Boost Software License, Version 1.0.
 4  //   (See accompanying file LICENSE.txt or copy at
 5  //        https://www.boost.org/LICENSE_1_0.txt)
 6  
 7  // SPDX-License-Identifier: BSL-1.0
 8  
 9  // 120-Bdd-ScenarioGivenWhenThen.cpp
10  
11  // main() provided by linkage with Catch2WithMain
12  
13  #include <catch2/catch_test_macros.hpp>
14  
15  SCENARIO( "vectors can be sized and resized", "[vector]" ) {
16  
17      GIVEN( "A vector with some items" ) {
18          std::vector<int> v( 5 );
19  
20          REQUIRE( v.size() == 5 );
21          REQUIRE( v.capacity() >= 5 );
22  
23          WHEN( "the size is increased" ) {
24              v.resize( 10 );
25  
26              THEN( "the size and capacity change" ) {
27                  REQUIRE( v.size() == 10 );
28                  REQUIRE( v.capacity() >= 10 );
29              }
30          }
31          WHEN( "the size is reduced" ) {
32              v.resize( 0 );
33  
34              THEN( "the size changes but not capacity" ) {
35                  REQUIRE( v.size() == 0 );
36                  REQUIRE( v.capacity() >= 5 );
37              }
38          }
39          WHEN( "more capacity is reserved" ) {
40              v.reserve( 10 );
41  
42              THEN( "the capacity changes but not the size" ) {
43                  REQUIRE( v.size() == 5 );
44                  REQUIRE( v.capacity() >= 10 );
45              }
46          }
47          WHEN( "less capacity is reserved" ) {
48              v.reserve( 0 );
49  
50              THEN( "neither size nor capacity are changed" ) {
51                  REQUIRE( v.size() == 5 );
52                  REQUIRE( v.capacity() >= 5 );
53              }
54          }
55      }
56  }
57  
58  // Compile & run:
59  // - g++ -std=c++14 -Wall -I$(CATCH_SINGLE_INCLUDE) -o 120-Bdd-ScenarioGivenWhenThen 120-Bdd-ScenarioGivenWhenThen.cpp && 120-Bdd-ScenarioGivenWhenThen --success
60  // - cl -EHsc -I%CATCH_SINGLE_INCLUDE% 120-Bdd-ScenarioGivenWhenThen.cpp && 120-Bdd-ScenarioGivenWhenThen --success
61  
62  // Expected compact output (all assertions):
63  //
64  // prompt> 120-Bdd-ScenarioGivenWhenThen.exe --reporter compact --success
65  // 120-Bdd-ScenarioGivenWhenThen.cpp:12: passed: v.size() == 5 for: 5 == 5
66  // 120-Bdd-ScenarioGivenWhenThen.cpp:13: passed: v.capacity() >= 5 for: 5 >= 5
67  // 120-Bdd-ScenarioGivenWhenThen.cpp:19: passed: v.size() == 10 for: 10 == 10
68  // 120-Bdd-ScenarioGivenWhenThen.cpp:20: passed: v.capacity() >= 10 for: 10 >= 10
69  // 120-Bdd-ScenarioGivenWhenThen.cpp:12: passed: v.size() == 5 for: 5 == 5
70  // 120-Bdd-ScenarioGivenWhenThen.cpp:13: passed: v.capacity() >= 5 for: 5 >= 5
71  // 120-Bdd-ScenarioGivenWhenThen.cpp:27: passed: v.size() == 0 for: 0 == 0
72  // 120-Bdd-ScenarioGivenWhenThen.cpp:28: passed: v.capacity() >= 5 for: 5 >= 5
73  // 120-Bdd-ScenarioGivenWhenThen.cpp:12: passed: v.size() == 5 for: 5 == 5
74  // 120-Bdd-ScenarioGivenWhenThen.cpp:13: passed: v.capacity() >= 5 for: 5 >= 5
75  // 120-Bdd-ScenarioGivenWhenThen.cpp:35: passed: v.size() == 5 for: 5 == 5
76  // 120-Bdd-ScenarioGivenWhenThen.cpp:36: passed: v.capacity() >= 10 for: 10 >= 10
77  // 120-Bdd-ScenarioGivenWhenThen.cpp:12: passed: v.size() == 5 for: 5 == 5
78  // 120-Bdd-ScenarioGivenWhenThen.cpp:13: passed: v.capacity() >= 5 for: 5 >= 5
79  // 120-Bdd-ScenarioGivenWhenThen.cpp:43: passed: v.size() == 5 for: 5 == 5
80  // 120-Bdd-ScenarioGivenWhenThen.cpp:44: passed: v.capacity() >= 5 for: 5 >= 5
81  // Passed 1 test case with 16 assertions.