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Original file line number | Diff line number | Diff line change |
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package errorutils | ||
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import ( | ||
"errors" | ||
"fmt" | ||
"testing" | ||
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"github.com/stretchr/testify/require" | ||
) | ||
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type customErr struct { | ||
FieldValue string | ||
} | ||
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func (e *customErr) Error() string { | ||
return e.FieldValue | ||
} | ||
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func shallowFilter(err error) bool { | ||
_, ok := err.(*customErr) | ||
return ok | ||
} | ||
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func deepFilter(err error) bool { | ||
var cerr *customErr | ||
return errors.As(err, &cerr) | ||
} | ||
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func removeAllFilter(err error) bool { | ||
return false | ||
} | ||
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func TestFilter(t *testing.T) { | ||
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errs := []error{ | ||
&customErr{FieldValue: "foo"}, | ||
fmt.Errorf("foo: %w", &customErr{FieldValue: "foo"}), | ||
errors.New("bar"), | ||
nil, | ||
} | ||
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filtered := Filter(errs, shallowFilter) | ||
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require.Len(t, filtered, 1) | ||
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for _, err := range filtered { | ||
require.NotNil(t, err) | ||
cerr, ok := err.(*customErr) | ||
require.True(t, ok, "cannot type assert to customErr") | ||
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require.NotEmpty(t, cerr.FieldValue) | ||
} | ||
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filtered = Filter(errs, deepFilter) | ||
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require.Len(t, filtered, 2) | ||
} | ||
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func TestFilteredNormal(t *testing.T) { | ||
errs := []error{ | ||
&customErr{FieldValue: "foo"}, | ||
fmt.Errorf("foo: %w", &customErr{FieldValue: "foo"}), | ||
errors.New("bar"), | ||
nil, | ||
} | ||
err := Join(errs...) | ||
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filtered := Filtered(err, shallowFilter) | ||
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require.Len(t, ShallowUnwrap(filtered), 1) | ||
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filtered = Filtered(err, deepFilter) | ||
require.Len(t, ShallowUnwrap(filtered), 2) | ||
} | ||
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func TestFilteredNil(t *testing.T) { | ||
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filtered := Filtered(nil, shallowFilter) | ||
require.Nil(t, filtered) | ||
} | ||
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func TestFilteredEmpty(t *testing.T) { | ||
errs := []error{ | ||
&customErr{FieldValue: "foo"}, | ||
fmt.Errorf("foo: %w", &customErr{FieldValue: "foo"}), | ||
errors.New("bar"), | ||
nil, | ||
} | ||
err := Join(errs...) | ||
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filtered := Filtered(err, removeAllFilter) | ||
require.Len(t, ShallowUnwrap(filtered), 0) | ||
} |