1 files changed, 72 insertions, 0 deletions
diff --git a/shared/src/test/scala/FieldNameTests.scala b/shared/src/test/scala/FieldNameTests.scala
new file mode 100644
index 0000000..f1b76a9
--- /dev/null
+++ b/shared/src/test/scala/FieldNameTests.scala
@@ -0,0 +1,72 @@
+package spray.json
+
+import org.scalatest._
+
+trait SnakeCaseFormats { self: DerivedFormats =>
+  override def extractFieldName(paramName: String) =
+    FieldNaming.substituteCamel(paramName, '_')
+}
+trait KebabCaseFormats { self: DerivedFormats =>
+  override def extractFieldName(paramName: String) =
+    FieldNaming.substituteCamel(paramName, '-')
+}
+
+object FieldNaming {
+
+  @inline final private def isLower(ch: Char): Boolean =
+    ((ch & 0x20) != 0) || (ch == '_')
+
+  @inline def substituteCamel(paramName: String, substitute: Char) = {
+    val length = paramName.length
+    val builder = new StringBuilder(length)
+    var i = 0
+    while (i < length) {
+      val cur = paramName(i)
+      if (isLower(cur) && i + 1 < length) {
+        builder.append(cur)
+        val next = paramName(i + 1)
+        if (!isLower(next)) {
+          builder.append(substitute)
+          builder.append((next ^ 0x20).toChar)
+        } else {
+          builder.append(next)
+        }
+        i += 1
+      } else {
+        builder.append((cur ^ 0x20).toChar)
+      }
+      i += 1
+    }
+    builder.result()
+  }
+
+}
+
+class FieldNameTests extends FlatSpec with FormatTests {
+
+  case class A(camelCASE: String, `__a_aB__`: Int, `a-a_B`: Int)
+  case class B(camelCaseA: A)
+
+  trait All extends DefaultJsonProtocol with DerivedFormats {
+    implicit val bFormat = jsonFormat[B]
+  }
+
+  {
+    object Protocol extends All with SnakeCaseFormats
+    import Protocol._
+    "snake_case" should behave like checkRoundtrip(
+      B(A("helloWorld", 0, 0)),
+      """{"camel_case_a":{"camel_case":"helloWorld","__a_a_b__":0,"a-a_b":0}}"""
+    )
+  }
+
+  {
+    object Protocol extends All with KebabCaseFormats
+    import Protocol._
+    "kebab-case" should behave like checkRoundtrip(
+      B(A("helloWorld", 0, 0)),
+      """{"camel-case-a":{"camel-case":"helloWorld","__a_a-b__":0,"a-a_b":0}}"""
+    )
+  }
+
+}