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package com.seaofnodes.simple;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import org.junit.Test;
import static org.junit.Assert.*;
import static org.junit.Assume.assumeTrue;
public class NativeExecutionTest {
// A subprocess with deterministic stdout, stderr, and process status.
public static class Child {
public static void main(String[] args) {
System.out.println("before exit");
System.err.println("child diagnostic");
System.exit(Integer.parseInt(args[0]));
}
}
private static String child(int exit) throws IOException {
String java = Path.of(System.getProperty("java.home"),"bin","java").toString();
return TestC.exec(java,"-cp",System.getProperty("java.class.path"),
Child.class.getName(),Integer.toString(exit));
}
private static void checkFailure(int exit) throws IOException {
try {
child(exit);
fail("Accepted process exit "+exit);
} catch( IOException e ) {
assertTrue(e.getMessage(),e.getMessage().contains("exit code: "+exit));
assertTrue(e.getMessage(),e.getMessage().contains("before exit"));
assertTrue(e.getMessage(),e.getMessage().contains("child diagnostic"));
}
}
@Test public void testNonzeroExit() throws IOException { checkFailure(7); }
@Test public void testFullWindowsExitCode() throws IOException {
assumeTrue(TestC.OS.startsWith("Windows"));
checkFailure(256); // Narrowing to a byte incorrectly reports success.
checkFailure(2816); // Observed Cygwin status for the Hello World crash.
}
@Test public void testSuccessfulOutput() throws IOException {
assertEquals("before exit"+System.lineSeparator(),child(0));
}
@Test public void testHelloWorldArtifacts() throws IOException {
new Chapter22Test().testHelloWorld();
new Chapter25Test().testHelloWorld();
// Model a parallel run paused between Chapter 22's link and execution.
// Chapter 25 must not replace the executable Chapter 22 is about to run.
String exe = "build/objs/helloWorld"+(TestC.OS.startsWith("Windows") ? ".exe" : "");
assertEquals("Hello, World!",TestC.exec(exe));
}
@Test public void testDriverNonzeroExit() throws Exception {
Path dir = Files.createTempDirectory(Path.of("build/objs"),"driver-exit-");
Path src = dir.resolve("fail.smp");
Files.writeString(src,"return 7;");
try {
Simple.main(new String[]{src.toString()});
fail("Driver accepted a failed executable");
} catch( IOException e ) {
assertTrue(e.getMessage(),e.getMessage().contains("exit code: 7"));
}
}
}
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