more VFS tests

Author: tomasstupka

graalpython/com.oracle.graal.python.test.integration/src/org/graalvm/python/embedding/utils/test/VirtualFileSystemTest.java

@@ -60,6 +60,7 @@
 import java.nio.file.AccessMode;
 import java.nio.file.DirectoryStream;
 import java.nio.file.Files;
+import java.nio.file.InvalidPathException;
 import java.nio.file.NoSuchFileException;
 import java.nio.file.NotDirectoryException;
 import java.nio.file.Path;
@@ -77,6 +78,7 @@
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import com.oracle.graal.python.test.integration.Utils;
 import org.graalvm.polyglot.Context;
 import org.graalvm.polyglot.Context.Builder;
 import org.graalvm.polyglot.HostAccess;
@@ -494,6 +496,10 @@ private static void checkExtractedFile(Path extractedFile, String[] expectedCont
         }
     }
 
+    private static void checkException(Class<?> exType, Callable<Object> c) {
+        checkException(exType, c, null);
+    }
+
     private static void checkException(Class<?> exType, Callable<Object> c, String msg) {
         boolean gotEx = false;
         try {
@@ -502,7 +508,7 @@ private static void checkException(Class<?> exType, Callable<Object> c, String m
             assert e.getClass() == exType;
             gotEx = true;
         }
-        assertTrue(msg, gotEx);
+        assertTrue(msg != null ? msg : "expected " + exType.getName(), gotEx);
     }
 
     @Test
@@ -863,6 +869,22 @@ public void externalResourcesBuilderTest() throws IOException {
         }
     }
 
+    @Test
+    public void vfsMountPointTest() {
+        if (IS_WINDOWS) {
+            checkException(IllegalArgumentException.class, () -> VirtualFileSystem.newBuilder().windowsMountPoint("test").build());
+            checkException(IllegalArgumentException.class, () -> VirtualFileSystem.newBuilder().windowsMountPoint("test\\").build());
+            checkException(IllegalArgumentException.class, () -> VirtualFileSystem.newBuilder().windowsMountPoint("\\test\\").build());
+            checkException(IllegalArgumentException.class, () -> VirtualFileSystem.newBuilder().windowsMountPoint("\\test").build());
+            checkException(InvalidPathException.class, () -> VirtualFileSystem.newBuilder().windowsMountPoint("X:\\test|test").build());
+        } else {
+            checkException(IllegalArgumentException.class, () -> VirtualFileSystem.newBuilder().unixMountPoint("test").build());
+            checkException(IllegalArgumentException.class, () -> VirtualFileSystem.newBuilder().unixMountPoint("test/").build());
+            checkException(IllegalArgumentException.class, () -> VirtualFileSystem.newBuilder().unixMountPoint("/test/").build());
+            checkException(InvalidPathException.class, () -> VirtualFileSystem.newBuilder().unixMountPoint("/test/\0").build());
+        }
+    }
+
     private static Builder addTestOptions(Builder builder) {
         return builder.option("engine.WarnInterpreterOnly", "false");
     }