Add a failing test for #2077

src/test/java/com/fasterxml/jackson/failing/TestPOJOAsArrayPolymorphic2077.java

@@ -0,0 +1,38 @@
+package com.fasterxml.jackson.failing;
+
+import com.fasterxml.jackson.annotation.JsonFormat;
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class TestPOJOAsArrayPolymorphic2077 extends BaseMapTest
+{
+    // [databind#2077]
+    @JsonTypeInfo(
+        use = JsonTypeInfo.Id.NAME,
+        include = JsonTypeInfo.As.WRAPPER_ARRAY)  // Both WRAPPER_OBJECT and WRAPPER_ARRAY cause the same problem
+    @JsonSubTypes({
+        @JsonSubTypes.Type(value = DirectLayout.class, name = "Direct"),
+    })
+    public interface Layout {
+    }
+
+    @JsonFormat(shape=JsonFormat.Shape.ARRAY)
+    public static class DirectLayout implements Layout {
+    }
+
+    private final ObjectMapper MAPPER = sharedMapper();
+
+    // [databind#2077]
+    public void testPolymorphicAsArray() throws Exception
+    {
+        // 20-Sep-2019, taut: this fails to add shape information, due to class annotations
+        //   not being checked due to missing `property` for `createContextual()`
+
+        String json = MAPPER.writeValueAsString(new DirectLayout());
+
+        Layout instance = MAPPER.readValue(json, Layout.class);
+        assertNotNull(instance);
+    }
+}