Add failing test for an issue FasterXML#1421

src/test/java/com/fasterxml/jackson/failing/SingleValueAsArray1421Test.java

@@ -0,0 +1,57 @@
+package com.fasterxml.jackson.failing;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+
+public class SingleValueAsArray1421Test
+{
+    private static final String JSON = "[{\"message\":\"messageHere\"}]";
+
+    static class A
+    {
+        List<B> bs = Collections.emptyList();
+
+        @JsonCreator
+        A(final List<B> bs)
+        {
+            this.bs = bs;
+        }
+    }
+
+    static class B
+    {
+        List<C> cs = Collections.emptyList();
+
+        @JsonCreator
+        B(final List<C> cs)
+        {
+            this.cs = cs;
+        }
+    }
+
+    public static class C
+    {
+        String message;
+
+        @JsonCreator
+        C(@JsonProperty("message") String message)
+        {
+            this.message = message;
+        }
+    }
+
+    @Test
+    public void testSuccessfulDeserializationOfObjectWithChainedArrayCreators() throws IOException
+    {
+        ObjectMapper om = new ObjectMapper();
+        om.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
+        om.readValue(JSON, A.class);
+    }
+}