Before

Spock是用于groovy项目的单元测试框架，这个框架简单易用，值得推广。

Coding

def "test when then expect"() { when: def x = Math.max(1, 2)

1    then:
2    x == 2
3
4    //可以简化成下面的
5    expect:
6    Math.max(1, 2) == 2
7}
8
9def "test setup or given"() {

// setup: // def stack = new Stack() // def elem = "push me"

1    //setup 与 given 等价
2
3    given:
4    def stack = new Stack()
5    def elem = "push me"
6
7    when:
8    stack.push(elem)
9
10    then:
11    !stack.empty
12    stack.size() == 1
13    stack.peek() == elem
14
15    when:
16    stack.pop()
17
18    then:
19    stack.empty
20
21    when:
22    stack.pop()
23
24    then:
25    //notThrown(EmptyStackException)
26    def e = thrown(EmptyStackException)
27    e.cause == null
28}
29
30def "test cleanup"() {
31    setup:
32    def stack = new Stack()
33    def elem = "push me"
34
35    when:
36    stack.push(elem)
37
38    then:
39    elem == stack.pop()
40
41    cleanup:
42    stack = null
43    elem = null
44}
45
46
47def "HashMap accepts null key"() {
48    setup:
49    def map = new HashMap()
50
51    when:
52    map.put(null, "elem")
53
54    then:
55    //thrown(NullPointerException)
56    notThrown(NullPointerException)
57}
58
59
60def "maximum of two numbers"() {
61    expect:
62    // exercise math method for a few different inputs
63    Math.max(1, 3) == 3
64    Math.max(7, 4) == 7
65    Math.max(0, 0) == 0
66}
67
68def "maximum of two numbers2"() {
69    expect:
70    Math.max(a, b) == c
71
72    where:
73    a | b || c
74    3 | 5 || 5
75    7 | 0 || 7
76    0 | 0 || 0
77}
78
79@Unroll
80def "maximum of #a and #b should be #c"() {
81    expect:
82    Math.max(a, b) == c
83
84    //Unroll 当成三个方法执行,否则就是在for循环里面执行
85    where:
86    a | b || c
87    3 | 5 || 5
88    7 | 0 || 7
89    0 | 0 || 0
90}

explain

如上方代码所见，spock每个feature method被划分为不同的block，不同的block处于测试执行的不同阶段，在测试运行时，各个block按照不同的顺序和规则被执行，如下：

package org.spockframework.runtime.model; public enum BlockKind { SETUP,//初始化资源,最前执行（与given等价） EXPECT,//期望，等同于assert（assert支持需要运行时配置VMOptions：java -ea） WHEN,//与then一起等同于expect THEN,//与when一起等同于expect CLEANUP,//清理资源,最后执行 WHERE;//循环跑测试 }

spock框架重点就是上面这些block，搞定！！！