Add test verifying that #5 has been fixed at some point

Author: cowtowncoder

yaml/src/test/java/com/fasterxml/jackson/dataformat/yaml/deser/ParserDupHandlingTest.java

@@ -0,0 +1,61 @@
+package com.fasterxml.jackson.dataformat.yaml.deser;
+
+import java.io.*;
+
+import com.fasterxml.jackson.core.*;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.ModuleTestBase;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+
+public class ParserDupHandlingTest extends ModuleTestBase
+{
+    private final static String YAML_WITH_DUPS =
+"name:\n"
++"  first: Bob\n"
++"  first: Dup\n";
+
+public void testDupChecksDisabled() throws Exception
+    {
+;
+        YAMLFactory f = new YAMLFactory();
+        assertFalse(f.isEnabled(JsonParser.Feature.STRICT_DUPLICATE_DETECTION));
+
+        ObjectMapper mapper = new ObjectMapper(f);
+        _verifyDupsOk(mapper, YAML_WITH_DUPS, false);
+        _verifyDupsOk(mapper, YAML_WITH_DUPS, true);
+    }
+
+    public void testDupChecksEnabled() throws Exception
+    {
+        YAMLFactory f = new YAMLFactory();
+        f.enable(JsonParser.Feature.STRICT_DUPLICATE_DETECTION);
+        ObjectMapper mapper = new ObjectMapper(f);
+        _verifyDupsFail(mapper, YAML_WITH_DUPS, false);
+        _verifyDupsFail(mapper, YAML_WITH_DUPS, true);
+    }
+
+    private void _verifyDupsOk(ObjectMapper mapper, String doc, boolean useBytes) throws Exception
+    {
+        JsonParser p = useBytes ? mapper.getFactory().createParser(new ByteArrayInputStream(doc.getBytes("UTF-8")))
+                : mapper.getFactory().createParser(new StringReader(doc));
+        _stream(p);
+        p.close();
+    }
+
+    private void _verifyDupsFail(ObjectMapper mapper, String doc, boolean useBytes) throws Exception
+    {
+        JsonParser p = useBytes ? mapper.getFactory().createParser(new ByteArrayInputStream(doc.getBytes("UTF-8")))
+                : mapper.getFactory().createParser(new StringReader(doc));
+        try {
+            _stream(p);
+        } catch (JsonProcessingException e) {
+            verifyException(e, "Duplicate field 'first'");
+        }
+        p.close();
+    }
+
+    private void _stream(JsonParser p) throws Exception
+    {
+        while (p.nextToken() != null) { }
+    }
+}