New stream SPIs now behave more like the built-in SPIs.

imageio/imageio-core/src/test/java/com/twelvemonkeys/imageio/stream/BufferedFileImageInputStreamSpiTest.java

@@ -1,9 +1,14 @@
 package com.twelvemonkeys.imageio.stream;
 
+import org.junit.Test;
+
 import javax.imageio.spi.ImageInputStreamSpi;
 import java.io.File;
 import java.io.IOException;
 
+import static org.junit.Assert.assertNull;
+import static org.junit.Assume.assumeFalse;
+
 public class BufferedFileImageInputStreamSpiTest extends ImageInputStreamSpiTest<File> {
     @Override
     protected ImageInputStreamSpi createProvider() {
@@ -14,4 +19,12 @@ public class BufferedFileImageInputStreamSpiTest extends ImageInputStreamSpiTest
     protected File createInput() throws IOException {
         return File.createTempFile("test-", ".tst");
     }
+
+    @Test
+    public void testReturnNullWhenFileDoesNotExist() throws IOException {
+        // This is really stupid behavior, but it is consistent with the JRE bundled SPIs.
+        File input = new File("a-file-that-should-not-exist-ever.fnf");
+        assumeFalse("File should not exist: " + input.getPath(), input.exists());
+        assertNull(provider.createInputStreamInstance(input));
+    }
 }

imageio/imageio-core/src/test/java/com/twelvemonkeys/imageio/stream/ImageInputStreamSpiTest.java

@@ -11,10 +11,10 @@ import java.util.Locale;
 import static org.junit.Assert.*;
 
 abstract class ImageInputStreamSpiTest<T> {
-    private final ImageInputStreamSpi provider = createProvider();
+    protected final ImageInputStreamSpi provider = createProvider();
 
     @SuppressWarnings("unchecked")
-    private final Class<T> inputClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
+    protected final Class<T> inputClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
 
     protected abstract ImageInputStreamSpi createProvider();