Initial project import

tools/v/vlib/builtin/rune_test.v

@@ -0,0 +1,84 @@
+fn test_repeat() {
+	r1 := `V`
+	r2 := `👋`
+
+	assert r1.repeat(5) == 'VVVVV'
+	assert r2.repeat(5) == '👋👋👋👋👋'
+
+	assert r1.repeat(1) == r1.str()
+	assert r2.repeat(1) == r2.str()
+
+	assert r1.repeat(0) == ''
+	assert r2.repeat(0) == ''
+}
+
+fn test_length_in_bytes() {
+	assert rune(0x0).length_in_bytes() == 1
+	assert `A`.length_in_bytes() == 1 // latin letter
+	assert rune(0x7F).length_in_bytes() == 1
+
+	assert rune(0x80).length_in_bytes() == 2
+	assert `Д`.length_in_bytes() == 2 // cyrillic letter
+	assert rune(0x7FF).length_in_bytes() == 2
+
+	assert rune(0x800).length_in_bytes() == 3
+	assert `喂`.length_in_bytes() == 3 // hey
+	assert rune(0xFFFF).length_in_bytes() == 3
+
+	assert rune(0xD800).length_in_bytes() == -1 // min for surrogates
+	assert rune(0xD866).length_in_bytes() == -1 // invalid
+	assert rune(0xDFFF).length_in_bytes() == -1 // max for surrogates
+
+	assert rune(0x100000).length_in_bytes() == 4
+	assert rune(0x10FFD7).length_in_bytes() == 4 // "Supplementary Private Use Area-B" ¯\_(ツ)_/¯
+	assert rune(0x10FFFF).length_in_bytes() == 4
+
+	assert rune(0x110000).length_in_bytes() == -1
+}
+
+fn test_bytes() {
+	r1 := `★`
+	assert r1.bytes() == [u8(0xe2), 0x98, 0x85]
+}
+
+fn test_to_upper() {
+	assert `c`.to_upper() == `C`
+	assert `C`.to_upper() == `C`
+	assert `δ`.to_upper() == `Δ`
+	assert `Δ`.to_upper() == `Δ`
+	assert `ā`.to_upper() == `Ā`
+	assert `Ā`.to_upper() == `Ā`
+	assert `Я`.to_upper() == `Я`
+	assert `я`.to_upper() == `Я`
+	assert `Dž`.to_upper() == `DŽ`
+	assert `dž`.to_upper() == `DŽ`
+	assert `DŽ`.to_upper() == `DŽ`
+}
+
+fn test_to_lower() {
+	assert `C`.to_lower() == `c`
+	assert `c`.to_lower() == `c`
+	assert `Δ`.to_lower() == `δ`
+	assert `δ`.to_lower() == `δ`
+	assert `Ā`.to_lower() == `ā`
+	assert `ā`.to_lower() == `ā`
+	assert `я`.to_lower() == `я`
+	assert `Я`.to_lower() == `я`
+	assert `Dž`.to_lower() == `dž`
+	assert `DŽ`.to_lower() == `dž`
+	assert `dž`.to_lower() == `dž`
+}
+
+fn test_to_title() {
+	assert `c`.to_title() == `C`
+	assert `C`.to_title() == `C`
+	assert `δ`.to_title() == `Δ`
+	assert `Δ`.to_title() == `Δ`
+	assert `ā`.to_title() == `Ā`
+	assert `Ā`.to_title() == `Ā`
+	assert `я`.to_title() == `Я`
+	assert `Я`.to_title() == `Я`
+	assert `DŽ`.to_title() == `Dž`
+	assert `dž`.to_title() == `Dž`
+	assert `Dž`.to_title() == `Dž`
+}