Bag

func Bag(expectedItems ...any) TestDeep

Bag operator compares the contents of an array or a slice (or a pointer on array/slice) without taking care of the order of items.

During a match, each expected item should match in the compared array/slice, and each array/slice item should be matched by an expected item to succeed.

td.Cmp(t, []int{1, 1, 2}, td.Bag(1, 1, 2))    // succeeds
td.Cmp(t, []int{1, 1, 2}, td.Bag(1, 2, 1))    // succeeds
td.Cmp(t, []int{1, 1, 2}, td.Bag(2, 1, 1))    // succeeds
td.Cmp(t, []int{1, 1, 2}, td.Bag(1, 2))       // fails, one 1 is missing
td.Cmp(t, []int{1, 1, 2}, td.Bag(1, 2, 1, 3)) // fails, 3 is missing

// works with slices/arrays of any type
td.Cmp(t, personSlice, td.Bag(
  Person{Name: "Bob", Age: 32},
  Person{Name: "Alice", Age: 26},
))

To flatten a non-[]any slice/array, use Flatten function and so avoid boring and inefficient copies:

expected := []int{1, 2, 1}
td.Cmp(t, []int{1, 1, 2}, td.Bag(td.Flatten(expected))) // succeeds
// = td.Cmp(t, []int{1, 1, 2}, td.Bag(1, 2, 1))

exp1 := []int{5, 1, 1}
exp2 := []int{8, 42, 3}
td.Cmp(t, []int{1, 5, 1, 8, 42, 3, 3},
  td.Bag(td.Flatten(exp1), 3, td.Flatten(exp2))) // succeeds
// = td.Cmp(t, []int{1, 5, 1, 8, 42, 3, 3}, td.Bag(5, 1, 1, 3, 8, 42, 3))

TypeBehind method can return a non-nil reflect.Type if all items known non-interface types are equal, or if only interface types are found (mostly issued from Isa()) and they are equal.

See also SubBagOf, SuperBagOf and Set.

See also Bag godoc.

Example

Base example

	t := &testing.T{}

	got := []int{1, 3, 5, 8, 8, 1, 2}

	// Matches as all items are present
	ok := td.Cmp(t, got, td.Bag(1, 1, 2, 3, 5, 8, 8),
		"checks all items are present, in any order")
	fmt.Println(ok)

	// Does not match as got contains 2 times 1 and 8, and these
	// duplicates are not expected
	ok = td.Cmp(t, got, td.Bag(1, 2, 3, 5, 8),
		"checks all items are present, in any order")
	fmt.Println(ok)

	got = []int{1, 3, 5, 8, 2}

	// Duplicates of 1 and 8 are expected but not present in got
	ok = td.Cmp(t, got, td.Bag(1, 1, 2, 3, 5, 8, 8),
		"checks all items are present, in any order")
	fmt.Println(ok)

	// Matches as all items are present
	ok = td.Cmp(t, got, td.Bag(1, 2, 3, 5, td.Gt(7)),
		"checks all items are present, in any order")
	fmt.Println(ok)

	// When expected is already a non-[]any slice, it cannot be
	// flattened directly using expected... without copying it to a new
	// []any slice, then use td.Flatten!
	expected := []int{1, 2, 3, 5}
	ok = td.Cmp(t, got, td.Bag(td.Flatten(expected), td.Gt(7)),
		"checks all expected items are present, in any order")
	fmt.Println(ok)

	// Output:
	// true
	// false
	// false
	// true
	// true

CmpBag shortcut

func CmpBag(t TestingT, got any, expectedItems []any, args ...any) bool

CmpBag is a shortcut for:

td.Cmp(t, got, td.Bag(expectedItems...), args...)

See above for details.

Returns true if the test is OK, false if it fails.

If t is a *T then its Config field is inherited.

args… are optional and allow to name the test. This name is used in case of failure to qualify the test. If len(args) > 1 and the first item of args is a string and contains a ‘%’ rune then fmt.Fprintf is used to compose the name, else args are passed to fmt.Fprint. Do not forget it is the name of the test, not the reason of a potential failure.

See also CmpBag godoc.

Example

Base example

	t := &testing.T{}

	got := []int{1, 3, 5, 8, 8, 1, 2}

	// Matches as all items are present
	ok := td.CmpBag(t, got, []any{1, 1, 2, 3, 5, 8, 8},
		"checks all items are present, in any order")
	fmt.Println(ok)

	// Does not match as got contains 2 times 1 and 8, and these
	// duplicates are not expected
	ok = td.CmpBag(t, got, []any{1, 2, 3, 5, 8},
		"checks all items are present, in any order")
	fmt.Println(ok)

	got = []int{1, 3, 5, 8, 2}

	// Duplicates of 1 and 8 are expected but not present in got
	ok = td.CmpBag(t, got, []any{1, 1, 2, 3, 5, 8, 8},
		"checks all items are present, in any order")
	fmt.Println(ok)

	// Matches as all items are present
	ok = td.CmpBag(t, got, []any{1, 2, 3, 5, td.Gt(7)},
		"checks all items are present, in any order")
	fmt.Println(ok)

	// When expected is already a non-[]any slice, it cannot be
	// flattened directly using expected... without copying it to a new
	// []any slice, then use td.Flatten!
	expected := []int{1, 2, 3, 5}
	ok = td.CmpBag(t, got, []any{td.Flatten(expected), td.Gt(7)},
		"checks all expected items are present, in any order")
	fmt.Println(ok)

	// Output:
	// true
	// false
	// false
	// true
	// true

T.Bag shortcut

func (t *T) Bag(got any, expectedItems []any, args ...any) bool

Bag is a shortcut for:

t.Cmp(got, td.Bag(expectedItems...), args...)

See above for details.

Returns true if the test is OK, false if it fails.

See also T.Bag godoc.

Example

Base example

	t := td.NewT(&testing.T{})

	got := []int{1, 3, 5, 8, 8, 1, 2}

	// Matches as all items are present
	ok := t.Bag(got, []any{1, 1, 2, 3, 5, 8, 8},
		"checks all items are present, in any order")
	fmt.Println(ok)

	// Does not match as got contains 2 times 1 and 8, and these
	// duplicates are not expected
	ok = t.Bag(got, []any{1, 2, 3, 5, 8},
		"checks all items are present, in any order")
	fmt.Println(ok)

	got = []int{1, 3, 5, 8, 2}

	// Duplicates of 1 and 8 are expected but not present in got
	ok = t.Bag(got, []any{1, 1, 2, 3, 5, 8, 8},
		"checks all items are present, in any order")
	fmt.Println(ok)

	// Matches as all items are present
	ok = t.Bag(got, []any{1, 2, 3, 5, td.Gt(7)},
		"checks all items are present, in any order")
	fmt.Println(ok)

	// When expected is already a non-[]any slice, it cannot be
	// flattened directly using expected... without copying it to a new
	// []any slice, then use td.Flatten!
	expected := []int{1, 2, 3, 5}
	ok = t.Bag(got, []any{td.Flatten(expected), td.Gt(7)},
		"checks all expected items are present, in any order")
	fmt.Println(ok)

	// Output:
	// true
	// false
	// false
	// true
	// true