1package assert
2
3import (
4 "fmt"
5 "reflect"
6)
7
8// isOrdered checks that collection contains orderable elements.
9func isOrdered(t TestingT, object interface{}, allowedComparesResults []compareResult, failMessage string, msgAndArgs ...interface{}) bool {
10 objKind := reflect.TypeOf(object).Kind()
11 if objKind != reflect.Slice && objKind != reflect.Array {
12 return false
13 }
14
15 objValue := reflect.ValueOf(object)
16 objLen := objValue.Len()
17
18 if objLen <= 1 {
19 return true
20 }
21
22 value := objValue.Index(0)
23 valueInterface := value.Interface()
24 firstValueKind := value.Kind()
25
26 for i := 1; i < objLen; i++ {
27 prevValue := value
28 prevValueInterface := valueInterface
29
30 value = objValue.Index(i)
31 valueInterface = value.Interface()
32
33 compareResult, isComparable := compare(prevValueInterface, valueInterface, firstValueKind)
34
35 if !isComparable {
36 return Fail(t, fmt.Sprintf("Can not compare type \"%s\" and \"%s\"", reflect.TypeOf(value), reflect.TypeOf(prevValue)), msgAndArgs...)
37 }
38
39 if !containsValue(allowedComparesResults, compareResult) {
40 return Fail(t, fmt.Sprintf(failMessage, prevValue, value), msgAndArgs...)
41 }
42 }
43
44 return true
45}
46
47// IsIncreasing asserts that the collection is increasing
48//
49// assert.IsIncreasing(t, []int{1, 2, 3})
50// assert.IsIncreasing(t, []float{1, 2})
51// assert.IsIncreasing(t, []string{"a", "b"})
52func IsIncreasing(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
53 return isOrdered(t, object, []compareResult{compareLess}, "\"%v\" is not less than \"%v\"", msgAndArgs...)
54}
55
56// IsNonIncreasing asserts that the collection is not increasing
57//
58// assert.IsNonIncreasing(t, []int{2, 1, 1})
59// assert.IsNonIncreasing(t, []float{2, 1})
60// assert.IsNonIncreasing(t, []string{"b", "a"})
61func IsNonIncreasing(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
62 return isOrdered(t, object, []compareResult{compareEqual, compareGreater}, "\"%v\" is not greater than or equal to \"%v\"", msgAndArgs...)
63}
64
65// IsDecreasing asserts that the collection is decreasing
66//
67// assert.IsDecreasing(t, []int{2, 1, 0})
68// assert.IsDecreasing(t, []float{2, 1})
69// assert.IsDecreasing(t, []string{"b", "a"})
70func IsDecreasing(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
71 return isOrdered(t, object, []compareResult{compareGreater}, "\"%v\" is not greater than \"%v\"", msgAndArgs...)
72}
73
74// IsNonDecreasing asserts that the collection is not decreasing
75//
76// assert.IsNonDecreasing(t, []int{1, 1, 2})
77// assert.IsNonDecreasing(t, []float{1, 2})
78// assert.IsNonDecreasing(t, []string{"a", "b"})
79func IsNonDecreasing(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
80 return isOrdered(t, object, []compareResult{compareLess, compareEqual}, "\"%v\" is not less than or equal to \"%v\"", msgAndArgs...)
81}