Fix jdk test logic

Author: MasseGuillaume

compat/src/test/scala/test/scala/collection/JdkVersionTest.scala

@@ -10,17 +10,19 @@ class JdkVersionTest {
     val isOnCi = sys.env.get("CI").isDefined
     if (isOnCi) {
       val travisJdkVersion = sys.env("TRAVIS_JDK_VERSION")
-      val jdkVersion = sys.props("java.specification.version")
+      val obtained = sys.props("java.specification.version")
 
       println(s"travisJdkVersion: $travisJdkVersion")
-      println(s"jdkVersion: $jdkVersion")
+      println(s"jdkVersion: $obtained")
 
-      if (travisJdkVersion == "openjdk6") {
-        assertEquals(jdkVersion, "1.8")
-      } else if (travisJdkVersion == "oraclejdk8") {
-        assertEquals(jdkVersion, "1.6")
-      } else {
-        throw new Exception(s"Unknown CI jdk version: $travisJdkVersion")
+      val expectedJdkVersion = Map(
+        "openjdk6"   -> "1.6",
+        "oraclejdk8" -> "1.8"
+      )
+
+      expectedJdkVersion.get(travisJdkVersion) match {
+        case Some(expected) => assertEquals(obtained, expected)
+        case None => throw new Exception(s"Unknown CI jdk version: $travisJdkVersion")
       }
     }
   }