Fix computation of sonatypeDefaultResolver for Sonatype Central (#501)

src/main/scala/xerial/sbt/Sonatype.scala

@@ -141,7 +141,7 @@ object Sonatype extends AutoPlugin with LogSupport {
     },
     sonatypeDefaultResolver := {
       if (sonatypeCredentialHost.value == SonatypeCentralClient.host) {
-        Resolver.url(s"https://$sonatypeCredentialHost")
+        Resolver.url(s"https://${sonatypeCredentialHost.value}")
       } else {
         val profileM   = sonatypeTargetRepositoryProfile.?.value
         val repository = sonatypeRepository.value

src/sbt-test/sbt-sonatype/sonatype-central-host/build.sbt

@@ -0,0 +1,8 @@
+sonatypeCredentialHost := xerial.sbt.sonatype.SonatypeCentralClient.host
+
+val checkSonatypeDefaultResolver = taskKey[Unit]("Check if the default resolver is Sonatype")
+checkSonatypeDefaultResolver := {
+  val actual   = sonatypeDefaultResolver.value
+  val expected = Resolver.url("https://central.sonatype.com")
+  require(actual == expected, s"expected $actual to be $expected")
+}

src/sbt-test/sbt-sonatype/sonatype-central-host/project/plugins.sbt

@@ -0,0 +1,8 @@
+{
+  val pluginVersion = System.getProperty("plugin.version")
+  if (pluginVersion == null)
+    throw new RuntimeException("""|The system property 'plugin.version' is not defined.
+                                  |Specify this property using the scriptedLaunchOpts -D.""".stripMargin)
+  else
+    addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % pluginVersion)
+}

src/sbt-test/sbt-sonatype/sonatype-central-host/test

@@ -0,0 +1 @@
+> checkSonatypeDefaultResolver