add another test for #1421

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/databind/module/TestKeyDeserializers.java

@@ -25,7 +25,6 @@ static class Foo {
 
         public Foo(String v) { value = v; }
     }
-    
 
     /*
     /**********************************************************

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

@@ -1,25 +1,27 @@
 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.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-public class SingleValueAsArray1421Test
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+
+import com.fasterxml.jackson.databind.*;
+
+public class SingleValueAsArray1421Test extends BaseMapTest
 {
     private static final String JSON = "[{\"message\":\"messageHere\"}]";
 
-    static class A
+    static class Bean1421A
     {
         List<Messages> bs = Collections.emptyList();
 
         @JsonCreator
-        A(final List<Messages> bs)
+        Bean1421A(final List<Messages> bs)
         {
             this.bs = bs;
         }
@@ -36,7 +38,7 @@ static class Messages
         }
     }
 
-    public static class MessageWrapper
+    static class MessageWrapper
     {
         String message;
 
@@ -47,11 +49,38 @@ public static class MessageWrapper
         }
     }
 
-    @Test
+    static class Bean1421B<T> {
+        T value;
+
+        @JsonCreator
+        public Bean1421B(T value) {
+            this.value = value;
+        }
+    }
+
+    /*
+    /**********************************************************
+    /* Unit tests
+    /**********************************************************
+     */
+    
+    private final ObjectMapper MAPPER = new ObjectMapper();
+    {
+        MAPPER.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
+    }
+
     public void testSuccessfulDeserializationOfObjectWithChainedArrayCreators() throws IOException
     {
-        ObjectMapper om = new ObjectMapper();
-        om.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
-        om.readValue(JSON, A.class);
+        MAPPER.readValue(JSON, Bean1421A.class);
+    }
+
+    public void test2() throws Exception {
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
+        Bean1421B<List<String>> a = objectMapper.readValue(quote("test2"),
+                new TypeReference<Bean1421B<List<String>>>() {});
+        List<String> expected = new ArrayList<>();
+        expected.add("test2");
+        assertEquals(expected, a.value);
     }
 }