aneurinandClaude Sonnet 5
82611a5e96
Broadens the built-in set with the string/presence checks that came up most often when reaching for this package: - Required[T comparable] non-zero value - Prefix / Suffix / Contains strings.HasPrefix/HasSuffix/Contains - Match(*regexp.Regexp) arbitrary pattern All follow the existing shape: a constructor returning func(T) error, a sentinel error matched with errors.Is, table-driven tests and an Example. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
70 lines
1.4 KiB
Go
70 lines
1.4 KiB
Go
package validate
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import (
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"errors"
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"fmt"
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"testing"
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)
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func ExamplePrefix() {
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fmt.Println(Prefix("https://")("http://example.com"))
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// Output: must start with "https://"
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}
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func TestPrefix(t *testing.T) {
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testCases := map[string]error{
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"https://example.com": nil,
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"https://": nil,
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"http://example.com": ErrMissingPrefix.With("https://"),
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"": ErrMissingPrefix.With("https://"),
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}
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v := Prefix("https://")
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for input, want := range testCases {
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t.Run(input, func(t *testing.T) {
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if got := v(input); !errors.Is(got, want) {
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t.Error("got", got, "want", want)
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}
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})
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}
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}
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func TestSuffix(t *testing.T) {
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testCases := map[string]error{
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"report.pdf": nil,
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".pdf": nil,
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"report.txt": ErrMissingSuffix.With(".pdf"),
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"pdf": ErrMissingSuffix.With(".pdf"),
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}
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v := Suffix(".pdf")
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for input, want := range testCases {
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t.Run(input, func(t *testing.T) {
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if got := v(input); !errors.Is(got, want) {
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t.Error("got", got, "want", want)
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}
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})
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}
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}
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func TestContains(t *testing.T) {
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testCases := map[string]error{
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"a b c": nil,
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" ": nil,
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"abc": ErrMissingSubstring.With(" "),
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"": ErrMissingSubstring.With(" "),
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}
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v := Contains(" ")
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for input, want := range testCases {
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t.Run(input, func(t *testing.T) {
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if got := v(input); !errors.Is(got, want) {
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t.Error("got", got, "want", want)
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}
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})
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}
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}
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