Add failing test for GitHub issue 337

src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/failing/GitHub337.kt

@@ -0,0 +1,66 @@
+package com.fasterxml.jackson.module.kotlin.test.github.failing
+
+import com.fasterxml.jackson.annotation.JsonInclude
+import com.fasterxml.jackson.annotation.JsonProperty
+import com.fasterxml.jackson.databind.MapperFeature.SORT_PROPERTIES_ALPHABETICALLY
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import org.junit.Ignore
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class TestGitHub337 {
+    private val mapper = jacksonObjectMapper()
+            .setSerializationInclusion(JsonInclude.Include.ALWAYS)
+            .configure(SORT_PROPERTIES_ALPHABETICALLY, true)
+    private val writer = mapper.writerWithDefaultPrettyPrinter()
+
+    @Test
+    @Ignore
+    fun test_ClassWithIsFields() {
+        data class ClassWithIsFields(
+                val isBooleanField: Boolean,
+                val isIntField: Int
+        )
+
+        val problematic = ClassWithIsFields(true, 9)
+        val expected = """
+        {
+          "isBooleanField" : true,
+          "isIntField" : 9
+        }""".trimIndent()
+        assertEquals(expected, writer.writeValueAsString(problematic))
+    }
+
+    @Test
+    @Ignore
+    fun test_AnnotatedClassWithIsFields() {
+        data class ClassWithIsFields(
+                @JsonProperty("isBooleanField") val isBooleanField: Boolean,
+                @JsonProperty("isIntField") val isIntField: Int
+        )
+
+        val problematic = ClassWithIsFields(true, 9)
+        val expected = """
+        {
+          "isBooleanField" : true,
+          "isIntField" : 9
+        }""".trimIndent()
+        assertEquals(expected, writer.writeValueAsString(problematic))
+    }
+
+    @Test
+    fun test_AnnotatedGetClassWithIsFields() {
+        data class ClassWithIsFields(
+                @JsonProperty("isBooleanField") val isBooleanField: Boolean,
+                @get:JsonProperty("isIntField") val isIntField: Int
+        )
+
+        val problematic = ClassWithIsFields(true, 9)
+        val expected = """
+        {
+          "isBooleanField" : true,
+          "isIntField" : 9
+        }""".trimIndent()
+        assertEquals(expected, writer.writeValueAsString(problematic))
+    }
+}