Created
April 16, 2015 02:48
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package ids | |
import ( | |
"fmt" | |
"testing" | |
"testing/quick" | |
) | |
func ExampleMarshalString() { | |
fmt.Print("\n") | |
s := marshalString(9223372036854775807) | |
fmt.Println(s) | |
s = marshalString(19821031) | |
fmt.Print(s) | |
// Output: | |
// 7ZZZZZZZZZZZZ | |
// JWWF7 | |
} | |
func ExampleUnmarshalString() { | |
fmt.Print("\n") | |
i, err := unmarshalString("7ZZZZZZZZZZZZ") | |
if err != nil { | |
fmt.Println(err) | |
} | |
fmt.Println(i) | |
i, err = unmarshalString("JWWF7") | |
if err != nil { | |
fmt.Println(err) | |
} | |
fmt.Println(i) | |
// Output: | |
// 9223372036854775807 | |
// 19821031 | |
} | |
// Positive int64 values should be isomorphic to encoded strings | |
// For any postive int64 value we should be able to encode it, decode it and have the same value | |
func TestIsomorphism(t *testing.T) { | |
abs := func(i int64) int64 { | |
if i < 0 { | |
return i * -1 | |
} | |
return i | |
} | |
absMarshalUnmarshal := func(i int64) int64 { | |
// fmt.Println("DEBUG: ", i, abs(i)) | |
enc := marshalString(abs(i)) | |
dec, err := unmarshalString(enc) | |
if err != nil { | |
return -1 | |
} | |
return dec | |
} | |
err := quick.CheckEqual(abs, absMarshalUnmarshal, nil) | |
if err != nil { | |
t.Error(err) | |
} | |
} |
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