KT-11208 Remove stream buffering

libraries/stdlib/test/io/Console.kt

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io
+
+import org.junit.Test
+import java.nio.charset.Charset
+import kotlin.test.*
+
+class ConsoleTest {
+    private val defaultLineSeparator: String = "\\n"
+
+    @Test
+    fun shouldReadEmptyLine() {
+        testReadLine("")
+    }
+
+    @Test
+    fun shouldReadOneLetter() {
+        testReadLine("a", "a")
+    }
+
+    @Test
+    fun shouldReadOneLine() {
+        testReadLine("first", "first")
+    }
+
+    @Test
+    fun shouldReadTwoLines() {
+        testReadLine("first${defaultLineSeparator}second", "first", "second")
+    }
+
+    @Test
+    fun shouldReadWindowsLineSeparator() {
+        val lineSeparator = "\\r\\n"
+        testReadLine("first${lineSeparator}second", "first", "second", lineSeparator = lineSeparator)
+    }
+
+    @Test
+    fun shouldReadOldMacLineSeparator() {
+        val lineSeparator = "\\r"
+        testReadLine("first${lineSeparator}second", "first", "second", lineSeparator = lineSeparator)
+    }
+
+    @Test
+    fun shouldReadMultibyteEncodings() {
+        testReadLine("first${defaultLineSeparator}second", "first", "second", charset = Charsets.UTF_32)
+    }
+
+    private fun testReadLine(
+            text: String,
+            vararg expected: String,
+            lineSeparator: String = defaultLineSeparator,
+            charset: Charset = Charsets.UTF_8
+    ) {
+        val actual = readLines(text, lineSeparator, charset)
+        assertEquals(expected.asList(), actual)
+    }
+
+    private fun readLines(text: String, lineSeparator: String, charset: Charset): List<String> {
+        text.byteInputStream(charset).use { stream ->
+            val decoder = charset.newDecoder()
+            return generateSequence { readLine(stream, lineSeparator, decoder) }.toList().also {
+                assertTrue("All bytes should be read") { stream.read() == -1 }
+            }
+        }
+    }
+}