Ilya Gorbunov
65 lines
2.0 KiB
Kotlin
65 lines
2.0 KiB
Kotlin
package test.exceptions
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import kotlin.test.*
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import test.collections.assertArrayNotSameButEquals
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import org.junit.Test as test
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import java.io.PrintWriter
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import java.io.*
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import java.nio.charset.Charset
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class ExceptionJVMTest {
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@test fun printStackTraceOnRuntimeException() {
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assertPrintStackTrace(RuntimeException("Crikey!"))
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assertPrintStackTraceStream(RuntimeException("Crikey2"))
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}
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@test fun printStackTraceOnError() {
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assertPrintStackTrace(Error("Oh dear"))
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assertPrintStackTraceStream(Error("Oh dear2"))
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}
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fun assertPrintStackTrace(t: Throwable) {
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val buffer = StringWriter()
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val writer = PrintWriter(buffer)
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t.printStackTrace(writer)
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comparePrintedThrowableResult(t, buffer.buffer)
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}
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fun assertPrintStackTraceStream(t: Throwable) {
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val byteBuffer = ByteArrayOutputStream()
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PrintStream(byteBuffer).use {
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t.printStackTrace(it)
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}
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val stream = PrintStream(byteBuffer)
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stream.use {
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t.printStackTrace(stream)
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}
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val bytes = assertNotNull(byteBuffer.toByteArray())
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val content = bytes.toString(Charset.defaultCharset())
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comparePrintedThrowableResult(t, content)
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}
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private fun comparePrintedThrowableResult(throwable: Throwable, printedThrowable: CharSequence) {
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val stackTrace = throwable.stackTrace
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val lines = printedThrowable.lines()
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assertEquals(throwable.toString(), lines[0])
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stackTrace.forEachIndexed { index, frame ->
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assertTrue(lines.any { frame.toString() in it }, "frame at index $index is not found in the printed message")
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}
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}
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@test fun changeStackTrace() {
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val exception = RuntimeException("Fail")
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var stackTrace = exception.stackTrace
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stackTrace = stackTrace.dropLast(1).toTypedArray()
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exception.stackTrace = stackTrace
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assertArrayNotSameButEquals(stackTrace, exception.stackTrace)
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}
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}
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