Add failing test for #303

ion/src/test/java/com/fasterxml/jackson/dataformat/ion/failing/UncaughtException303Test.java

@@ -0,0 +1,38 @@
+package com.fasterxml.jackson.dataformat.ion.failing;
+
+import java.net.URL;
+
+import org.junit.Test;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.dataformat.ion.IonObjectMapper;
+
+import static org.junit.Assert.*;
+
+public class UncaughtException303Test
+{
+    private final IonObjectMapper MAPPER = IonObjectMapper.builder().build();
+
+    // [dataformats-binary#303]
+    @Test
+    public void testUncaughtException303() throws Exception
+    {
+        URL poc = getClass().getResource("/data/issue-303.ion");
+        try {
+            MAPPER.readTree(poc);
+            fail("Should not pass with invalid content");
+        } catch (JsonProcessingException e) {
+            // !!! TODO: change to match what we actually expect
+            verifyException(e, "MATCH MESSAGE");
+        }
+    }
+
+    void verifyException(Throwable e, String match)
+    {
+        String msg = e.getMessage();
+        String lmsg = (msg == null) ? "" : msg.toLowerCase();
+        if (lmsg.indexOf(match.toLowerCase()) < 0) {
+            fail("Expected an exception with a substrings ("+match+"): got one with message \""+msg+"\"");
+        }
+    }
+}

ion/src/test/java/com/fasterxml/jackson/dataformat/ion/misc/UncaughtExceptionsTest.java

@@ -1,7 +1,6 @@
 package com.fasterxml.jackson.dataformat.ion.misc;
 
 import java.net.URL;
-import java.util.Arrays;
 
 import org.junit.Test;