tests: add tests for pc info

tests/cross/src/test/scala/tests/pc/InfoSuite.scala

@@ -0,0 +1,62 @@
+package tests.pc
+
+import scala.meta.internal.jdk.CollectionConverters._
+import scala.meta.pc.PcSymbolKind
+import scala.meta.pc.PcSymbolProperty
+
+import tests.BasePCSuite
+import scala.meta.pc.PcSymbolInformation
+
+class InfoSuite extends BasePCSuite {
+
+  def getInfo(symbol: String): PcSymbolInformation = {
+    val result = presentationCompiler.info(symbol).get()
+    assert(result.isPresent(), s"no info returned for symbol $symbol")
+    assertNoDiff(result.get().symbol(), symbol)
+    result.get()
+  }
+
+  test("list") {
+    val info = getInfo("scala/collection/immutable/List#")
+    assert(info.properties().contains(PcSymbolProperty.ABSTRACT))
+    assert(info.parents().contains("scala/collection/immutable/LinearSeq#"))
+  }
+
+  test("empty-list-constructor") {
+    val info = getInfo("scala/collection/immutable/List.empty().")
+    assertNoDiff(info.classOwner(), "scala/collection/immutable/List.")
+    assertEquals(info.kind(), PcSymbolKind.METHOD)
+  }
+
+  test("assert") {
+    val info = getInfo("scala/Predef.assert().")
+    assertEquals(info.kind(), PcSymbolKind.METHOD)
+    assertNoDiff(info.classOwner(), "scala/Predef.")
+    assertEquals(
+      info.alternativeSymbols().asScala.mkString("\n"),
+      "scala/Predef.assert(+1)."
+    )
+  }
+
+  test("flatMap") {
+    val info = getInfo("scala/collection/immutable/List#flatMap().")
+    assertEquals(info.kind(), PcSymbolKind.METHOD)
+    assertNoDiff(info.classOwner(), "scala/collection/immutable/List#")
+    val correctOverridden =
+      if (scalaVersion.startsWith("2.12") || scalaVersion.startsWith("2.11")) {
+        """|scala/collection/TraversableLike#flatMap().
+           |scala/collection/GenTraversableLike#flatMap().
+           |scala/collection/generic/FilterMonadic#flatMap().
+           |""".stripMargin
+      } else {
+        """|scala/collection/StrictOptimizedIterableOps#flatMap().
+           |scala/collection/IterableOps#flatMap().
+           |scala/collection/IterableOnceOps#flatMap().
+           |""".stripMargin
+      }
+    assertNoDiff(
+      info.overriddenSymbols().asScala.mkString("\n"),
+      correctOverridden
+    )
+  }
+}