Reporting test names

scalac-scoverage-plugin/src/main/scala/scoverage/IOUtils.scala

@@ -71,13 +71,16 @@ object IOUtils {
   val isDebugReportFile = (file: File) => file.getName == Constants.XMLReportFilenameWithDebug
 
   // loads all the invoked statement ids from the given files
-  def invoked(files: Seq[File]): Set[Int] = {
-    val acc = mutable.Set[Int]()
+  def invoked(files: Seq[File]): Set[(Int, String)] = {
+    val acc = mutable.Set[(Int, String)]()
     files.foreach { file =>
       val reader = Source.fromFile(file)
       for ( line <- reader.getLines() ) {
         if (!line.isEmpty) {
-          acc += line.toInt
+          acc += (line.split(" ").toList match {
+            case List(idx, clazz) => (idx.toInt, clazz)
+            case List(idx) => (idx.toInt, "")
+          })
         }
       }
       reader.close()

scalac-scoverage-plugin/src/main/scala/scoverage/coverage.scala

@@ -38,8 +38,8 @@ case class Coverage()
   // returns the classes by least coverage
   def risks(limit: Int) = classes.toSeq.sortBy(_.statementCount).reverse.sortBy(_.statementCoverage).take(limit)
 
-  def apply(ids: Iterable[Int]): Unit = ids foreach invoked
-  def invoked(id: Int): Unit = statementsById.get(id).foreach(_.invoked())
+  def apply(ids: Iterable[(Int, String)]): Unit = ids foreach invoked
+  def invoked(id: (Int, String)): Unit = statementsById.get(id._1).foreach(_.invoked(id._2))
 }
 
 trait MethodBuilders {
@@ -119,9 +119,13 @@ case class Statement(location: Location,
                      treeName: String,
                      branch: Boolean,
                      var count: Int = 0,
-                     ignored: Boolean = false) extends java.io.Serializable {
+                     ignored: Boolean = false,
+                     tests: mutable.Set[String] = mutable.Set[String]()) extends java.io.Serializable {
   def source = location.sourcePath
-  def invoked(): Unit = count = count + 1
+  def invoked(test: String): Unit = {
+    count = count + 1
+    if(test != "") tests += test
+  }
   def isInvoked = count > 0
 }
 

scalac-scoverage-plugin/src/main/scala/scoverage/plugin.scala

@@ -35,6 +35,8 @@ class ScoveragePlugin(val global: Global) extends Plugin {
         options.dataDir = opt.substring("dataDir:".length)
       } else if (opt.startsWith("extraAfterPhase:") || opt.startsWith("extraBeforePhase:")) {
         // skip here, these flags are processed elsewhere
+      } else if (opt == "reportTestName") {
+        options.reportTestName = true
       } else {
         error("Unknown option: " + opt)
       }
@@ -82,6 +84,7 @@ class ScoverageOptions {
   var excludedFiles: Seq[String] = Nil
   var excludedSymbols: Seq[String] = Seq("scala.reflect.api.Exprs.Expr", "scala.reflect.api.Trees.Tree", "scala.reflect.macros.Universe.Tree")
   var dataDir: String = IOUtils.getTempPath
+  var reportTestName: Boolean = false
 }
 
 class ScoverageInstrumentationComponent(val global: Global, extraAfterPhase: Option[String], extraBeforePhase: Option[String])
@@ -161,14 +164,17 @@ class ScoverageInstrumentationComponent(val global: Global, extraAfterPhase: Opt
           ),
           newTermName("invoked")
         ),
-        List(
-          Literal(
-            Constant(id)
-          ),
-          Literal(
-            Constant(options.dataDir)
-          )
-        )
+        Literal(
+          Constant(id)
+        ) ::
+        Literal(
+          Constant(options.dataDir)
+        ) ::
+        (if(options.reportTestName)
+          List(Literal(
+            Constant(true)
+          ))
+        else Nil)
       )
     }
 

scalac-scoverage-plugin/src/main/scala/scoverage/report/StatementWriter.scala

@@ -24,6 +24,7 @@ class StatementWriter(mFile: MeasuredFile) {
         <th>Pos</th>
         <th>Tree</th>
         <th>Symbol</th>
+        <th>Tests</th>
         <th>Code</th>
       </tr>{mFile.statements.toSeq.sortBy(_.line).map(stmt => {
       <tr>
@@ -44,6 +45,9 @@ class StatementWriter(mFile: MeasuredFile) {
         <td>
           {stmt.symbolName}
         </td>
+        <td>
+          {stmt.tests.mkString(",")}
+        </td>
         <td style={cellStyle(stmt.isInvoked)}>
           {stmt.desc}
         </td>

scalac-scoverage-plugin/src/test/scala/scoverage/IOUtilsTest.scala

@@ -17,7 +17,7 @@ class IOUtilsTest extends AnyFreeSpec with OneInstancePerTest with Matchers {
       writer.write("1\n5\n9\n\n10\n")
       writer.close()
       val invoked = IOUtils.invoked(Seq(file))
-      assert(invoked === Set(1, 5, 9, 10))
+      assert(invoked === Set((1, ""), (5, ""), (9, ""), (10, "")))
 
       file.delete()
     }
@@ -38,7 +38,7 @@ class IOUtilsTest extends AnyFreeSpec with OneInstancePerTest with Matchers {
 
       val files = IOUtils.findMeasurementFiles(file1.getParent)
       val invoked = IOUtils.invoked(files.toIndexedSeq)
-      assert(invoked === Set(1, 2, 5, 7, 9, 10, 14))
+      assert(invoked === Set((1, ""), (2, ""), (5, ""), (7, ""), (9, ""), (10, ""), (14, "")))
 
       file1.delete()
       file2.delete()

scalac-scoverage-runtime/shared/src/main/scala/scoverage/Invoker.scala

@@ -31,7 +31,7 @@ object Invoker {
    * @param id the id of the statement that was invoked
    * @param dataDir the directory where the measurement data is held
    */
-  def invoked(id: Int, dataDir: String): Unit = {
+  def invoked(id: Int, dataDir: String, reportTestName: Boolean = false): Unit = {
     // [sam] we can do this simple check to save writing out to a file.
     // This won't work across JVMs but since there's no harm in writing out the same id multiple
     // times since for coverage we only care about 1 or more, (it just slows things down to
@@ -55,12 +55,19 @@ object Invoker {
         threadFiles.set(files)
       }
       val writer = files.getOrElseUpdate(dataDir, new FileWriter(measurementFile(dataDir), true))
-      writer.append(Integer.toString(id)).append("\n").flush()
 
+      if(reportTestName) writer.append(Integer.toString(id)).append(" ").append(getCallingScalaTest).append("\n").flush()
+      else writer.append(Integer.toString(id)).append("\n").flush()
       ids.put(id, ())
     }
   }
 
+  def getCallingScalaTest: String =
+    Thread.currentThread.getStackTrace
+      .map(_.getClassName.toLowerCase)
+      .find(name => name.endsWith("suite") || name.endsWith("spec") || name.endsWith("test"))
+      .getOrElse("")
+
   def measurementFile(dataDir: File): File = measurementFile(dataDir.getAbsolutePath)
   def measurementFile(dataDir: String): File = new File(dataDir, MeasurementsPrefix + runtimeUUID + "."  + Thread.currentThread.getId)