Add basic test case for ITFWriter (#758)

core/src/test/java/com/google/zxing/oned/ITFWriterTestCase.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2017 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.oned;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.common.BitMatrixTestCase;
+import org.junit.Assert;
+import org.junit.Test;
+
+public final class ITFWriterTestCase extends Assert {
+
+  @Test
+  public void testEncode() throws WriterException {
+    doTest("00123456789012",
+           "0000010101010111000111000101110100010101110001110111010001010001110100011" +
+           "100010101000101011100011101011101000111000101110100010101110001110100000");
+  }
+
+  private static void doTest(String input, CharSequence expected) throws WriterException {
+    BitMatrix result = new ITFWriter().encode(input, BarcodeFormat.ITF, 0, 0);
+    assertEquals(expected, BitMatrixTestCase.matrixToString(result));
+  }
+
+}