Zemian Deng
299 lines
8.4 KiB
Kotlin
299 lines
8.4 KiB
Kotlin
package test.string
|
|
|
|
import kotlin.test.*
|
|
|
|
import org.junit.Test as test
|
|
|
|
class StringJVMTest {
|
|
test fun stringIterator() {
|
|
var sum = 0
|
|
for(c in "239")
|
|
sum += (c.toInt() - '0'.toInt())
|
|
assertTrue(sum == 14)
|
|
}
|
|
|
|
test fun stringBuilderIterator() {
|
|
var sum = 0
|
|
val sb = StringBuilder()
|
|
for(c in "239")
|
|
sb.append(c)
|
|
|
|
println(sb)
|
|
|
|
for(c in sb)
|
|
sum += (c.toInt() - '0'.toInt())
|
|
assertTrue(sum == 14)
|
|
}
|
|
|
|
test fun orEmpty() {
|
|
val s: String? = "hey"
|
|
val ns: String? = null
|
|
|
|
assertEquals("hey", s.orEmpty())
|
|
assertEquals("", ns.orEmpty())
|
|
}
|
|
|
|
test fun toShort() {
|
|
assertEquals(77.toShort(), "77".toShort())
|
|
}
|
|
|
|
test fun toInt() {
|
|
assertEquals(77, "77".toInt())
|
|
}
|
|
|
|
test fun toLong() {
|
|
assertEquals(77.toLong(), "77".toLong())
|
|
}
|
|
|
|
test fun count() {
|
|
val text = "hello there\tfoo\nbar"
|
|
val whitespaceCount = text.count { it.isWhitespace() }
|
|
assertEquals(3, whitespaceCount)
|
|
}
|
|
|
|
test fun testSplitByChar() {
|
|
val s = "ab\n[|^$&\\]^cd"
|
|
var list = s.split('b');
|
|
assertEquals(2, list.size)
|
|
assertEquals("a", list[0])
|
|
assertEquals("\n[|^$&\\]^cd", list[1])
|
|
list = s.split('^')
|
|
assertEquals(3, list.size)
|
|
assertEquals("cd", list[2])
|
|
list = s.split('.')
|
|
assertEquals(1, list.size)
|
|
assertEquals(s, list[0])
|
|
}
|
|
|
|
test fun repeat() {
|
|
fails{ "foo".repeat(-1) }
|
|
assertEquals("", "foo".repeat(0))
|
|
assertEquals("foo", "foo".repeat(1))
|
|
assertEquals("foofoo", "foo".repeat(2))
|
|
assertEquals("foofoofoo", "foo".repeat(3))
|
|
}
|
|
|
|
test fun filter() {
|
|
assertEquals("acdca", "abcdcba".filter { !it.equals('b') })
|
|
assertEquals("1234", "a1b2c3d4".filter { it.isDigit() })
|
|
}
|
|
|
|
test fun filterNot() {
|
|
assertEquals("acdca", "abcdcba".filterNot { it.equals('b') })
|
|
assertEquals("abcd", "a1b2c3d4".filterNot { it.isDigit() })
|
|
}
|
|
|
|
test fun reverse() {
|
|
assertEquals("dcba", "abcd".reverse())
|
|
assertEquals("4321", "1234".reverse())
|
|
assertEquals("", "".reverse())
|
|
}
|
|
|
|
test fun forEach() {
|
|
val data = "abcd1234"
|
|
var count = 0
|
|
data.forEach{ count++ }
|
|
assertEquals(data.length(), count)
|
|
}
|
|
|
|
test fun all() {
|
|
val data = "AbCd"
|
|
assertTrue {
|
|
data.all { it.isJavaLetter() }
|
|
}
|
|
assertNot {
|
|
data.all { it.isUpperCase() }
|
|
}
|
|
}
|
|
|
|
test fun any() {
|
|
val data = "a1bc"
|
|
assertTrue {
|
|
data.any() { it.isDigit() }
|
|
}
|
|
assertNot {
|
|
data.any() { it.isUpperCase() }
|
|
}
|
|
}
|
|
|
|
test fun appendString() {
|
|
val data = "kotlin"
|
|
val sb = StringBuilder()
|
|
data.appendString(sb, "^", "<", ">")
|
|
assertEquals("<k^o^t^l^i^n>", sb.toString())
|
|
}
|
|
|
|
test fun find() {
|
|
val data = "a1b2c3"
|
|
assertEquals('1', data.find { it.isDigit() })
|
|
assertNull(data.find { it.isUpperCase() })
|
|
}
|
|
|
|
test fun findNot() {
|
|
val data = "1a2b3c"
|
|
assertEquals('a', data.findNot { it.isDigit() })
|
|
assertNull(data.findNot { it.isJavaLetterOrDigit() })
|
|
}
|
|
|
|
test fun partition() {
|
|
val data = "a1b2c3"
|
|
val pair = data.partition { it.isDigit() }
|
|
assertEquals("123", pair.first, "pair.first")
|
|
assertEquals("abc", pair.second, "pair.second")
|
|
}
|
|
|
|
test fun flatMap() {
|
|
val data = "abcd"
|
|
val result = data.flatMap { listOf(it) }
|
|
assertEquals(data.size, result.count())
|
|
assertEquals(data.toCharList(), result)
|
|
}
|
|
|
|
test fun fold() {
|
|
// calculate number of digits in the string
|
|
val data = "a1b2c3def"
|
|
val result = data.fold(0, { digits, c -> if(c.isDigit()) digits + 1 else digits } )
|
|
assertEquals(3, result)
|
|
|
|
//simulate all method
|
|
assertEquals(true, "ABCD".fold(true, { r, c -> r && c.isUpperCase() }))
|
|
|
|
//get string back
|
|
assertEquals(data, data.fold("", { s, c -> s + c }))
|
|
}
|
|
|
|
test fun foldRight() {
|
|
// calculate number of digits in the string
|
|
val data = "a1b2c3def"
|
|
val result = data.foldRight(0, { c, digits -> if(c.isDigit()) digits + 1 else digits })
|
|
assertEquals(3, result)
|
|
|
|
//simulate all method
|
|
assertEquals(true, "ABCD".foldRight(true, { c, r -> r && c.isUpperCase() }))
|
|
|
|
//get string back
|
|
assertEquals(data, data.foldRight("", { s, c -> "" + s + c }))
|
|
}
|
|
|
|
test fun reduce() {
|
|
// get the smallest character(by char value)
|
|
assertEquals('a', "bacfd".reduce { v, c -> if (v > c) c else v })
|
|
|
|
failsWith(javaClass<UnsupportedOperationException>()) {
|
|
"".reduce { a, b -> '\n' }
|
|
}
|
|
}
|
|
|
|
test fun reduceRight() {
|
|
// get the smallest character(by char value)
|
|
assertEquals('a', "bacfd".reduceRight { c, v -> if (v > c) c else v })
|
|
|
|
failsWith(javaClass<UnsupportedOperationException>()) {
|
|
"".reduceRight { a, b -> '\n' }
|
|
}
|
|
}
|
|
|
|
test fun groupBy() {
|
|
// collect similar characters by their int code
|
|
val data = "ababaaabcd"
|
|
val result = data.groupBy { it.toInt() }
|
|
assertEquals(4, result.size)
|
|
assertEquals("bbb", result.get('b'.toInt()))
|
|
}
|
|
|
|
test fun makeString() {
|
|
val data = "abcd"
|
|
val result = data.makeString("_", "(", ")")
|
|
assertEquals("(a_b_c_d)", result)
|
|
|
|
val data2 = "verylongstring"
|
|
val result2 = data2.makeString("-", "[", "]", 11, "oops")
|
|
assertEquals("[v-e-r-y-l-o-n-g-s-t-r-oops]", result2)
|
|
}
|
|
|
|
test fun dropWhile() {
|
|
val data = "ab1cd2"
|
|
val result = data.dropWhile { it.isJavaLetter() }
|
|
assertEquals("1cd2", result)
|
|
}
|
|
|
|
test fun drop() {
|
|
val data = "abcd1234"
|
|
assertEquals("d1234", data.drop(3))
|
|
assertEquals(data, data.drop(-2))
|
|
assertEquals("", data.drop(data.length + 5))
|
|
}
|
|
|
|
test fun takeWhile() {
|
|
val data = "ab1cd2"
|
|
val result = data.takeWhile { it.isJavaLetter() }
|
|
assertEquals("ab", result)
|
|
}
|
|
|
|
test fun take() {
|
|
val data = "abcd1234"
|
|
assertEquals("abc", data.take(3))
|
|
assertEquals("", data.take(-7))
|
|
assertEquals(data, data.take(data.length + 42))
|
|
}
|
|
|
|
test fun formatter() {
|
|
assertEquals("12", "%d%d".format(1, 2))
|
|
}
|
|
|
|
test fun trimLeading() {
|
|
assertEquals("", "".trimLeading())
|
|
assertEquals("a", "a".trimLeading())
|
|
assertEquals("a", " a".trimLeading())
|
|
assertEquals("a", " a".trimLeading())
|
|
assertEquals("a ", " a ".trimLeading())
|
|
assertEquals("a b", " a b".trimLeading())
|
|
assertEquals("a b ", " a b ".trimLeading())
|
|
|
|
assertEquals("a", "\ta".trimLeading())
|
|
assertEquals("a", "\t\ta".trimLeading())
|
|
assertEquals("a", "\ra".trimLeading())
|
|
assertEquals("a", "\na".trimLeading())
|
|
}
|
|
|
|
test fun trimTrailing() {
|
|
assertEquals("", "".trimTrailing())
|
|
assertEquals("a", "a".trimTrailing())
|
|
assertEquals("a", "a ".trimTrailing())
|
|
assertEquals("a", "a ".trimTrailing())
|
|
assertEquals(" a", " a ".trimTrailing())
|
|
assertEquals("a b", "a b ".trimTrailing())
|
|
assertEquals(" a b", " a b ".trimTrailing())
|
|
|
|
assertEquals("a", "a\t".trimTrailing())
|
|
assertEquals("a", "a\t\t".trimTrailing())
|
|
assertEquals("a", "a\r".trimTrailing())
|
|
assertEquals("a", "a\n".trimTrailing())
|
|
}
|
|
|
|
test fun trimTrailingAndLeading() {
|
|
val examples = array(
|
|
"a",
|
|
" a ",
|
|
" a ",
|
|
" a b ",
|
|
"\ta\tb\t",
|
|
"\t\ta\t\t",
|
|
"\ra\r",
|
|
"\na\n"
|
|
)
|
|
|
|
for (example in examples) {
|
|
assertEquals(example.trim(), example.trimTrailing().trimLeading())
|
|
assertEquals(example.trim(), example.trimLeading().trimTrailing())
|
|
}
|
|
}
|
|
|
|
test fun toByteArrayEncodings() {
|
|
val s = "hello"
|
|
val defaultCharset = java.nio.charset.Charset.defaultCharset()!!
|
|
assertEquals(s.toByteArray().toString(), s.toByteArray(defaultCharset).toString())
|
|
assertEquals(s.toByteArray().toString(), s.toByteArray(defaultCharset.name()).toString())
|
|
}
|
|
}
|