Add test for package documentation

Author: pikinier20

scaladoc-testcases/src/tests/packageobjdocs/package.scala

@@ -0,0 +1,10 @@
+package tests
+
+/** Some documentation that should be present in Scaladoc
+ *
+ * It's a test
+ *
+ */
+package object packageobjdocs {
+  def placeholder: Int = 42
+}

scaladoc/test/dotty/tools/scaladoc/PackageDocumentationTest.scala

@@ -0,0 +1,23 @@
+package dotty.tools.scaladoc
+
+import org.junit.Assert._
+import com.vladsch.flexmark.util.{ast => mdu, sequence}
+import com.vladsch.flexmark.{ast => mda}
+import collection.JavaConverters._
+
+
+class PackageDocumentationTest extends ScaladocTest("packageobjdocs"):
+  override def runTest: Unit = withModule { module =>
+    module.members.values.find {
+      case member if member.kind == Kind.Package => true
+      case _ => false
+    }.flatMap(_.docs).map(_.body).fold(throw AssertionError("No package found or documentation is not present")) {
+      case node: mdu.ContentNode =>
+        val text = node.getDescendants().asScala.toList.map {
+          case node: mdu.ContentNode => node.getContentChars().toString()
+          case _ => ""
+        }.mkString
+        assertTrue("Documentation for package is incorrect", text.contains("It's a test"))
+      case _ => throw AssertionError("No documentation node found in package docs")
+    }
+  }