A few more tests and fix handling of data: URIs in command line decoder

javase/src/main/java/com/google/zxing/client/j2se/DecodeWorker.java

@@ -93,9 +93,14 @@ final class DecodeWorker implements Callable<Integer> {
       inputFileName = inputPath.getFileName().toString();
     } else {
       outDir = Paths.get(".").toRealPath();
-      String[] pathElements = input.getPath().split("/");
+      String path = input.getPath();
+      if (path == null) {
+        inputFileName = "input";
+      } else {
+        String[] pathElements = path.split("/");
         inputFileName = pathElements[pathElements.length - 1];
       }
+    }
 
     // Replace/add extension
     int pos = inputFileName.lastIndexOf('.');

javase/src/test/java/com/google/zxing/client/j2se/CommandLineEncoderTestCase.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2018 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.zxing.client.j2se;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public final class CommandLineEncoderTestCase extends Assert {
+
+  @Test
+  public void testEncode() throws Exception {
+    File out = File.createTempFile("qrcode", ".png");
+    out.deleteOnExit();
+    String[] args = {
+        "--barcode_format", "QR_CODE",
+        "--image_format", "PNG",
+        "--output", out.toString(),
+        "--width", "1", "--height", "1",
+        "--error-correction-level", "L",
+        "HELLO" };
+    CommandLineEncoder.main(args);
+
+    Path outPath = out.toPath();
+    assertTrue(Files.exists(outPath));
+    assertTrue(Files.size(outPath) > 0);
+    BufferedImage image = ImageIO.read(out);
+    assertEquals(33, image.getHeight());
+    assertEquals(33, image.getWidth());
+  }
+
+}

javase/src/test/java/com/google/zxing/client/j2se/CommandLineRunnerTestCase.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2018 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.zxing.client.j2se;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public final class CommandLineRunnerTestCase extends Assert {
+
+  @Test
+  public void testCommandLineRunner() throws Exception {
+    String[] args = { "--pure_barcode", DecodeWorkerTestCase.IMAGE_DATA_URI };
+    // Not a lot to do here but make sure it runs
+    CommandLineRunner.main(args);
+  }
+
+}

javase/src/test/java/com/google/zxing/client/j2se/DecodeWorkerTestCase.java

@@ -30,7 +30,7 @@ import java.util.Queue;
  */
 public final class DecodeWorkerTestCase extends Assert {
 
-  private static final String IMAGE_DATA_URI =
+  static final String IMAGE_DATA_URI =
       "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACEAAAAhAQAAAAB/n//CAAAAkklEQVR42mP4DwQNDJjkB4" +
       "E77A0M369N/d7A8CV6rjiQjPMFkWG1QPL7RVGg%2BAfREKCa/5/vA9V/nFSQ3sDwb7/KdiDJqX4dSH4pXN/A8DfyDVD2" +
       "988HQPUfPVaqA0XKz%2BgD9bIk1AP1fgwvB7KlS9VBdqXbA82PT9AH2fiaH2SXGdDM71fDgeIfhIvKsbkTTAIAKYVr0N" +