Function Contains

internal/testing/cmp/cmp.go:23–45

Contains succeeds if item is in collection. The collection may be a string, map, slice, or array. See [gotest.tools/v3/assert/cmp.Contains]. When either item or collection is a multi-line string, the failure message contains a multi-line report of the differences.

(collection, item any)

// item or collection is a multi-line string, the failure message contains a
// multi-line report of the differences.
func Contains(collection, item any) Comparison {
	cString, cStringOK := collection.(string)
	iString, iStringOK := item.(string)

	if cStringOK && iStringOK {
		if strings.Contains(cString, "\n") || strings.Contains(iString, "\n") {
			return func() gotest.Result {
				if strings.Contains(cString, iString) {
					return gotest.ResultSuccess
				}
				return gotest.ResultFailureTemplate(`
--- {{ with callArg 0 }}{{ formatNode . }}{{else}}←{{end}} string does not contain
+++ {{ with callArg 1 }}{{ formatNode . }}{{else}}→{{end}} substring
{{ .Data.diff }}`,
					map[string]any{
						"diff": gocmp.Diff(collection, item),
					})
			}
		}
	}

	return gotest.Contains(collection, item)
}

// DeepEqual compares two values using [github.com/google/go-cmp/cmp] and
// succeeds if the values are equal. The comparison can be customized using