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91 lines
2.5 KiB
Go
91 lines
2.5 KiB
Go
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package stringsutil
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import (
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"testing"
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)
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func TestLessNatural(t *testing.T) {
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f := func(a, b string, resultExpected bool) {
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t.Helper()
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result := LessNatural(a, b)
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if result != resultExpected {
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t.Fatalf("unexpected result for LessNatural(%q, %q); got %v; want %v", a, b, result, resultExpected)
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}
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}
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// comparison with empty string
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f("", "", false)
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f("", "foo", true)
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f("foo", "", false)
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f("", "123", true)
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f("123", "", false)
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// identical values
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f("foo", "foo", false)
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f("123", "123", false)
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f("foo123", "foo123", false)
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f("123foo", "123foo", false)
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f("000", "000", false)
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f("00123", "00123", false)
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f("00foo", "00foo", false)
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f("abc00foo0123", "abc00foo0123", false)
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// identical values with different number of zeroes in front of them
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f("00123", "0123", false)
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f("0123", "00123", true)
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// numeric comparsion
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f("123", "99", false)
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f("99", "123", true)
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// floating-point comparsion (works unexpectedly - this is OK for natural sort order)
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f("1.23", "1.123", true)
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f("1.123", "1.23", false)
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// non-numeric comparison
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f("foo", "bar", false)
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f("fo", "bar", false)
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f("bar", "foo", true)
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f("bar", "fo", true)
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// comparison with common non-numeric prefix
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f("abc_foo", "abc_bar", false)
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f("abc_bar", "abc_foo", true)
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f("abc_foo", "abc_", false)
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f("abc_", "abc_foo", true)
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f("abc_123", "abc_foo", true)
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f("abc_foo", "abc_123", false)
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// comparison with common numeric prefix
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f("123foo", "123bar", false)
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f("123bar", "123foo", true)
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f("123", "123bar", true)
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f("123bar", "123", false)
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f("123_456", "123_78", false)
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f("123_78", "123_456", true)
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// too big integers - fall back to string order
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f("1234567890123456789012345", "1234567890123456789012345", false)
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f("1234567890123456789012345", "123456789012345678901234", false)
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f("123456789012345678901234", "1234567890123456789012345", true)
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f("193456789012345678901234", "1234567890123456789012345", false)
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f("123456789012345678901234", "1934567890123456789012345", true)
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f("1934", "1234567890123456789012345", false)
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f("1234567890123456789012345", "1934", true)
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// integers with many zeroes in front
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f("00000000000000000000000000123", "0000000000000000000000000045", false)
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f("0000000000000000000000000045", "00000000000000000000000000123", true)
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// unicode strings
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f("бвг", "мирг", true)
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f("мирг", "бвг", false)
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f("abcde", "мирг", true)
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f("мирг", "abcde", false)
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f("123", "мирг", true)
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f("мирг", "123", false)
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f("12345", "мирг", true)
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f("мирг", "12345", false)
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}
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