Add test for issue iheartradio#82

build.sbt

@@ -38,6 +38,14 @@ lazy val project = Project("project", file("."))
         }
       }
     },
+    unmanagedSourceDirectories in Test ++= {
+      (unmanagedSourceDirectories in Test).value.map { dir =>
+        CrossVersion.partialVersion(scalaVersion.value) match {
+          case Some((2, 13)) => file(dir.getPath ++ "-2.13+")
+          case _ =>  file(dir.getPath ++ "-2.13-")
+        }
+      }
+    },
     libraryDependencies ++= 
       (if (scalaVersion.value.startsWith("2.10"))
          Seq(

src/test/scala-2.13+/net/ceedubs/ficus/Issue82Spec.scala

@@ -0,0 +1,23 @@
+package net.ceedubs.ficus
+
+import net.ceedubs.ficus.Ficus._
+import net.ceedubs.ficus.readers.ArbitraryTypeReader._
+import com.typesafe.config._
+import org.specs2.mutable.Specification
+
+class Issue82Spec extends Specification {
+  "Ficus config" should {
+    "not throw `java.lang.ClassCastException`" in {
+      case class TestSettings(val `foo-bar`: Long, `foo`: String)
+      val config = ConfigFactory.parseString("""{ foo-bar: 3, foo: "4" }""")
+      config.as[TestSettings] must not(throwA[java.lang.ClassCastException])
+    }
+
+    """should not assign "foo-bar" to "foo"""" in {
+      case class TestSettings(val `foo-bar`: String, `foo`: String)
+      val config = ConfigFactory.parseString("""{ foo-bar: "foo-bar", foo: "foo" }""")
+      val settings = config.as[TestSettings]
+      (settings.`foo-bar` mustEqual "foo-bar") and (settings.`foo` mustEqual "foo")
+    }
+  }
+}