tests/integration/UnsafeSharedCacheTest.java

package com.jvm.external;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.junit.Test;

import static org.hamcrest.core.StringContains.containsString;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

public class UnsafeSharedCacheTest {

  private static String OS = System.getProperty("os.name").toLowerCase();

  @Test
  public void test_jarsOnClassPath_areInTheSharedCache() throws IOException, URISyntaxException {
    // No support for symlinks on Windows. Let's skip that.
      if (OS.indexOf("win") != -1) {
          return;
      }
      ClassLoader cl = ClassLoader.getSystemClassLoader();
      for (URL url : ((URLClassLoader) cl).getURLs()) {
          URI uri = url.toURI();
          String uriString = uri.toString();
          if (uriString.contains("repo1.maven.org") || uriString.contains("jcentray.bintray.com")) {
              if (OS.indexOf("mac") >= 0) {
                  // Mac.
                  // The jar's path is automatically resolved to the actual location on macOS.
                  assertThat(uriString, containsString("Library/Caches/Coursier/v1"));
              } else {
                  // Linux.
                  // Assert that the symlink points to the jar in the default Coursier shared cache location
                  // https://github.com/coursier/coursier/blob/master/doc/docs/cache.md#location
                  if (Files.isSymbolicLink(Paths.get(uri))) {
                      // If it's a symlink, we'll need to resolve it twice: output base -> shared cache.
                      Path symlinkDest = Files.readSymbolicLink(Files.readSymbolicLink(Paths.get(uri)));
                      assertThat(symlinkDest.toString(), containsString(".cache/coursier/v1"));
                  } else {
                      assertThat(uriString, containsString(".cache/coursier/v1"));
                  }
              }
          }
      }
  }

}