Add printer tests

Author: allanrenucci

compiler/test/dotty/tools/dotc/printing/PrinterTests.scala

@@ -0,0 +1,27 @@
+package dotty.tools.dotc.printing
+
+import dotty.tools.DottyTest
+import dotty.tools.dotc.ast.tpd
+import dotty.tools.dotc.core.Names._
+import dotty.tools.dotc.core.Symbols._
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class PrinterTests extends DottyTest {
+  import tpd._
+
+  @Test
+  def packageObject: Unit = {
+    val source = """
+      package object foo {
+        def bar: Int = 1
+      }
+    """
+
+    checkCompile("frontend", source) { (tree, context) =>
+      implicit val ctx = context
+      val bar = tree.find(tree => tree.symbol.name == termName("bar")).get
+      assertEquals("package object foo", bar.symbol.owner.show)
+    }
+  }
+}