Migrate stdlib, tests and samples to new case conversion api

libraries/stdlib/jvm/src/kotlin/text/StringsJVM.kt

@@ -717,6 +717,7 @@ public inline fun String.toPattern(flags: Int = 0): java.util.regex.Pattern {
 @Deprecated("Use replaceFirstChar instead.", ReplaceWith("replaceFirstChar { if (it.isLowerCase()) it.titlecase(Locale.getDefault()) else it.toString() }", "java.util.Locale"))
 @DeprecatedSinceKotlin(warningSince = "1.5")
 public actual fun String.capitalize(): String {
+    @Suppress("DEPRECATION")
     return capitalize(Locale.getDefault())
 }
 
@@ -759,6 +760,7 @@ public fun String.capitalize(locale: Locale): String {
 @Deprecated("Use replaceFirstChar instead.", ReplaceWith("replaceFirstChar { it.lowercase(Locale.getDefault()) }", "java.util.Locale"))
 @DeprecatedSinceKotlin(warningSince = "1.5")
 public actual fun String.decapitalize(): String {
+    @Suppress("DEPRECATION")
     return if (isNotEmpty() && !this[0].isLowerCase()) substring(0, 1).toLowerCase() + substring(1) else this
 }
 

libraries/stdlib/jvm/test/text/StringJVMTest.kt

@@ -74,6 +74,7 @@ class StringJVMTest {
         assertEquals("UTF-32BE", Charsets.UTF_32BE.name())
     }
 
+    @Suppress("DEPRECATION")
     @Test fun capitalize() {
         fun testCapitalize(expected: String, string: String) {
             assertEquals(expected, string.capitalize())
@@ -90,6 +91,7 @@ class StringJVMTest {
 
     @Test fun decapitalize() {
         fun testDecapitalize(expected: String, string: String) {
+            @Suppress("DEPRECATION")
             assertEquals(expected, string.decapitalize())
             assertEquals(expected, string.replaceFirstChar { it.lowercase(Locale.getDefault()) })
         }
@@ -98,6 +100,7 @@ class StringJVMTest {
         testDecapitalize("dzdzdz", "Dzdzdz")
     }
 
+    @Suppress("DEPRECATION")
     @Test fun capitalizeLocale() {
         fun testCapitalizeLocale(expected: String, string: String, locale: Locale) {
             assertEquals(expected, string.capitalize(locale))
@@ -122,6 +125,7 @@ class StringJVMTest {
 
     @Test fun decapitalizeLocale() {
         fun testDecapitalizeLocale(expected: String, string: String, locale: Locale) {
+            @Suppress("DEPRECATION")
             assertEquals(expected, string.decapitalize(locale))
             assertEquals(expected, string.replaceFirstChar { it.lowercase(locale) })
         }

libraries/stdlib/samples/test/samples/collections/collections.kt

@@ -475,7 +475,7 @@ class Collections {
         fun distinctAndDistinctBy() {
             val list = listOf('a', 'A', 'b', 'B', 'A', 'a')
             assertPrints(list.distinct(), "[a, A, b, B]")
-            assertPrints(list.distinctBy { it.toUpperCase() }, "[a, b]")
+            assertPrints(list.distinctBy { it.uppercaseChar() }, "[a, b]")
         }
 
         @Sample
@@ -523,7 +523,7 @@ class Collections {
             assertPrints(numbers.joinToString(prefix = "<", postfix = ">", separator = "•"), "<1•2•3•4•5•6>")
 
             val chars = charArrayOf('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q')
-            assertPrints(chars.joinToString(limit = 5, truncated = "...!") { it.toUpperCase().toString() }, "A, B, C, D, E, ...!")
+            assertPrints(chars.joinToString(limit = 5, truncated = "...!") { it.uppercaseChar().toString() }, "A, B, C, D, E, ...!")
         }
 
         @Sample

libraries/stdlib/samples/test/samples/misc/preconditions.kt

@@ -40,7 +40,7 @@ class Preconditions {
             val requiredParam: String? = params["required"]
             requireNotNull(requiredParam) { "Required value must be non-null" }
             // now requiredParam is smartcast to String so that it is unnecessary to use the safe call(?.)
-            println(requiredParam.toUpperCase())
+            println(requiredParam.uppercase())
         }
 
         val params: MutableMap<String, String?> = mutableMapOf("required" to null)

libraries/stdlib/samples/test/samples/text/strings.kt

@@ -6,12 +6,14 @@ import kotlin.test.*
 
 class Strings {
 
+    @Suppress("DEPRECATION")
     @Sample
     fun capitalize() {
         assertPrints("abcd".capitalize(), "Abcd")
         assertPrints("Abcd".capitalize(), "Abcd")
     }
 
+    @Suppress("DEPRECATION")
     @Sample
     fun decapitalize() {
         assertPrints("abcd".decapitalize(), "abcd")

libraries/stdlib/test/text/CharTest.kt

@@ -82,7 +82,7 @@ class CharTest {
 
         for (char in 'A'..'Z') {
             val digit = 10 + (char - 'A')
-            val lower = char.toLowerCase()
+            val lower = char.lowercaseChar()
 
             for (radix in digit + 1..36) {
                 testEquals(digit, char, radix)

libraries/stdlib/test/text/StringTest.kt

@@ -290,6 +290,7 @@ class StringTest {
 
     @Test fun capitalize() {
         fun testCapitalize(expected: String, string: String) {
+            @Suppress("DEPRECATION")
             assertEquals(expected, string.capitalize())
             assertEquals(expected, string.replaceFirstChar { it.uppercase() })
         }
@@ -301,6 +302,7 @@ class StringTest {
 
     @Test fun decapitalize() {
         fun testDecapitalize(expected: String, string: String) {
+            @Suppress("DEPRECATION")
             assertEquals(expected, string.decapitalize())
             assertEquals(expected, string.replaceFirstChar { it.lowercase() })
         }