Now running real tests

modules/api/src/main/scala/gs/test/v0/api/Assertion.scala

@@ -1,62 +0,0 @@
-package gs.test.v0.api
-
-import scala.reflect.*
-
-sealed abstract class Assertion(val name: String)
-
-object Assertion:
-
-  private def success(): Either[TestFailure, Unit] = Right(())
-
-  // TODO: Use a smart rendering solution, consider diffs.
-  // For now, this is fine -- add a diff library later as data.
-  def renderInput[A](value: A): String = value.toString()
-
-  case object IsEqualTo extends Assertion("isEqualTo"):
-
-    def evaluate[A: ClassTag](
-      candidate: A,
-      expected: A
-    )(
-      using
-      CanEqual[A, A]
-    )(
-      using
-      pos: SourcePosition
-    ): Either[TestFailure, Unit] =
-      if candidate == expected then success()
-      else
-        val runtimeType = classTag[A].runtimeClass.getName()
-        Left(
-          TestFailure.AssertionFailed(
-            assertionName = name,
-            inputs = Map(
-              "candidate" -> runtimeType,
-              "expected"  -> runtimeType
-            ),
-            message =
-              s"'${renderInput(candidate)}' was not equal to '${renderInput(candidate)}'",
-            pos = pos
-          )
-        )
-
-  case object IsTrue extends Assertion("isTrue"):
-
-    def evaluate(
-      candidate: Boolean
-    )(
-      using
-      pos: SourcePosition
-    ): Either[TestFailure, Unit] =
-      if candidate then success()
-      else
-        Left(
-          TestFailure.AssertionFailed(
-            assertionName = name,
-            inputs = Map("candidate" -> "Boolean"),
-            message = s"Expected '$candidate' to be 'true'.",
-            pos = pos
-          )
-        )
-
-end Assertion

modules/api/src/main/scala/gs/test/v0/api/Check.scala

@@ -1,9 +1,11 @@
 package gs.test.v0.api
 
+import cats.data.EitherT
 import cats.effect.Sync
+import scala.reflect.*
 import scala.reflect.ClassTag
 
-/** Opaque type used to check candidate values against expected values.
+/** Opaque type used to check obtained values against expected values.
   */
 opaque type Check[A] = A
 
@@ -11,18 +13,38 @@ object Check:
 
   /** Instantiate a new Check.
     *
-    * @param candidate
+    * @param obtained
     *   The value to check.
     * @return
     *   The new [[Check]] instance.
     */
-  def apply[A](candidate: A): Check[A] = candidate
+  def apply[A](obtained: A): Check[A] = obtained
 
-  extension [A](candidate: Check[A])
+  private def testPassed(): TestResult = Right(())
+
+  private def render[A](value: A): String = value.toString()
+
+  private def assertionFailed(
+    assertionName: String,
+    inputs: Map[String, String],
+    message: String
+  )(
+    using
+    pos: SourcePosition
+  ): TestResult = Left(
+    TestFailure.AssertionFailed(
+      assertionName = assertionName,
+      inputs = inputs,
+      message = message,
+      pos = pos
+    )
+  )
+
+  extension [A](obtained: Check[A])
     /** @return
       *   The unwrapped value of this [[Check]].
       */
-    def unwrap(): A = candidate
+    def unwrap(): A = obtained
 
     /** ## Usage
       *
@@ -34,7 +56,7 @@ object Check:
       * @param expected
       *   The expected value.
       * @return
-      *   Successful test result if the candidate value is equal to the expected
+      *   Successful test result if the obtained value is equal to the expected
       *   value, an error describing the test failure otherwise.
       */
     def isEqualTo(
@@ -45,7 +67,18 @@ object Check:
       ClassTag[A],
       SourcePosition
     ): TestResult =
-      Assertion.IsEqualTo.evaluate(candidate, expected)
+      if obtained == expected then testPassed()
+      else
+        val runtimeType = classTag[A].runtimeClass.getName()
+        assertionFailed(
+          assertionName = "isEqualTo",
+          inputs = Map(
+            "obtained" -> runtimeType,
+            "expected" -> runtimeType
+          ),
+          message =
+            s"'${render(obtained)}' was not equal to '${render(expected)}'"
+        )
 
     /** ## Usage
       *
@@ -60,8 +93,8 @@ object Check:
       *   The expected value.
       * @return
       *   Effect that when evaluated will produce: successful test result if the
-      *   candidate value is equal to the expected value, an error describing
-      *   the test failure otherwise.
+      *   obtained value is equal to the expected value, an error describing the
+      *   test failure otherwise.
       */
     def isEqualToF[F[_]: Sync](
       expected: A
@@ -73,7 +106,7 @@ object Check:
     ): F[TestResult] =
       Sync[F].delay(isEqualTo(expected))
 
-  extension (check: Check[Boolean])
+  extension (obtained: Check[Boolean])
 
     /** ## Usage
       *
@@ -83,7 +116,7 @@ object Check:
       * }}}
       *
       * @return
-      *   Successful test result if the candidate value is `true`, an error
+      *   Successful test result if the obtained value is `true`, an error
       *   describing the test failure otherwise.
       */
     def isTrue(
@@ -91,7 +124,13 @@ object Check:
       using
       SourcePosition
     ): TestResult =
-      Assertion.IsTrue.evaluate(check)
+      if obtained then testPassed()
+      else
+        assertionFailed(
+          assertionName = "isTrue",
+          inputs = Map("obtained" -> "Boolean"),
+          message = s"Expected '$obtained' to be 'true'."
+        )
 
     /** ## Usage
       *
@@ -104,7 +143,7 @@ object Check:
       *
       * @return
       *   Effect that when evaluated will produce: successful test result if the
-      *   candidate value is `true`, an error describing the test failure
+      *   obtained value is `true`, an error describing the test failure
       *   otherwise.
       */
     def isTrueF[F[_]: Sync](
@@ -114,4 +153,11 @@ object Check:
     ): F[TestResult] =
       Sync[F].delay(isTrue())
 
+    def isTrueT[F[_]: Sync](
+    )(
+      using
+      SourcePosition
+    ): EitherT[F, TestFailure, Any] =
+      EitherT(Sync[F].delay(isTrue()))
+
 end Check

modules/api/src/main/scala/gs/test/v0/api/syntax.scala

@@ -180,4 +180,4 @@ def checkAllF[F[_]: Sync](
       }
   }
 
-def check[A](candidate: A): Check[A] = Check(candidate)
+def check[A](obtained: A): Check[A] = Check(obtained)

modules/api/src/test/scala/gs/test/v0/api/GroupImplementationTests.scala

@@ -132,12 +132,4 @@ object GroupImplementationTests:
 
   end G3
 
-  class G4[F[_]: Async] extends TestGroup[F]:
-    override def name: String = "G4"
-
-    // TODO: Make test entrypoint and test Trace[F]
-    test(Ids.T4, "Effectful test").effectful {
-      ???
-    }
-
 end GroupImplementationTests

modules/reporting/src/main/scala/gs/test/v0/reporting/InMemoryReporter.scala

@@ -9,6 +9,19 @@ import gs.test.v0.api.GroupResult
 import gs.test.v0.api.SuiteExecution
 import gs.test.v0.api.TestExecution
 
+/** Reporter that collects all results into memory.
+  *
+  * ### Lifecycle
+  *
+  * This reporter is intended to be used to get results _exactly once_, after
+  * the engine has completed its work. The function `terminateAndGetResults`
+  * will remove all results from the internal collection.
+  *
+  * @param suiteExecution
+  *   Collector for the [[SuiteExecution]].
+  * @param groupResults
+  *   Collector for grouped test results.
+  */
 final class InMemoryReporter[F[_]: Async] private (
   suiteExecution: Ref[F, Option[SuiteExecution]],
   groupResults: Queue[F, Option[(GroupResult, List[TestExecution])]]
@@ -34,14 +47,28 @@ final class InMemoryReporter[F[_]: Async] private (
     */
   override def endReport(): F[Unit] = groupResults.offer(None)
 
+  /** @return
+    *   The recorded [[SuiteExecution]]. This will be empty unless `reportSuite`
+    *   was called.
+    */
   def getSuiteExecution(): F[Option[SuiteExecution]] = suiteExecution.get
 
+  /** Immediatelly call `endReport` (to ensure terminal state) and collect all
+    * recorded results. This is a destructive call that will remove the results
+    * from this reporter.
+    *
+    * @return
+    *   The list of extracted results.
+    */
   def terminateAndGetResults(): F[List[(GroupResult, List[TestExecution])]] =
     endReport() *>
       fs2.Stream.fromQueueNoneTerminated(groupResults).compile.toList
 
 object InMemoryReporter:
 
+  /** @return
+    *   Resource that provides a new [[InMemoryReporter]].
+    */
   def provision[F[_]: Async]: Resource[F, InMemoryReporter[F]] =
     Resource.make(
       for

modules/runtime/src/test/scala/gs/test/v0/runtime/engine/TestEngineTests.scala

@@ -2,9 +2,10 @@ package gs.test.v0.runtime.engine
 
 import cats.effect.IO
 import cats.effect.Resource
-import gs.test.v0.api.TestGroupDefinition
+import gs.test.v0.api.*
 import gs.test.v0.reporting.InMemoryReporter
 import gs.test.v0.runtime.engine.TestEngineTests.EngineObservation
+import gs.test.v0.runtime.engine.TestEngineTests.G1
 import gs.timing.v0.MonotonicProvider.ManualTickProvider
 import gs.timing.v0.Timing
 import gs.uuid.v0.UUID
@@ -34,6 +35,50 @@ class TestEngineTests extends IOSuite:
     }
   }
 
+  iotest("should run an engine with a single passing test") {
+    newEngine().use { obs =>
+      val g1    = new G1
+      val group = g1.compile()
+      for
+        suiteExecution <- obs.engine.runSuite(
+          suite = Generators.testSuite(),
+          tests = fs2.Stream.apply(group)
+        )
+        rootSpan  <- obs.entryPoint.getSpan(EngineConstants.Tracing.RootSpan)
+        groupSpan <- obs.entryPoint.getSpan(EngineConstants.Tracing.FullGroup)
+        beforeGroupSpan <- obs.entryPoint.getSpan(
+          EngineConstants.Tracing.BeforeGroup
+        )
+        afterGroupSpan <- obs.entryPoint.getSpan(
+          EngineConstants.Tracing.AfterGroup
+        )
+        inGroupSpan  <- obs.entryPoint.getSpan(EngineConstants.Tracing.InGroup)
+        fullTestSpan <- obs.entryPoint.getSpan(EngineConstants.Tracing.FullTest)
+        beforeTestSpan <- obs.entryPoint.getSpan(
+          EngineConstants.Tracing.BeforeTest
+        )
+        afterTestSpan <- obs.entryPoint.getSpan(
+          EngineConstants.Tracing.AfterTest
+        )
+        testSpan <- obs.entryPoint.getSpan(EngineConstants.Tracing.TestSpan)
+        results  <- obs.reporter.terminateAndGetResults()
+      yield
+        assertEquals(rootSpan.isDefined, true)
+        assertEquals(groupSpan.isDefined, true)
+        assertEquals(beforeGroupSpan.isDefined, true)
+        assertEquals(afterGroupSpan.isDefined, true)
+        assertEquals(inGroupSpan.isDefined, true)
+        assertEquals(fullTestSpan.isDefined, true)
+        assertEquals(beforeTestSpan.isDefined, true)
+        assertEquals(afterTestSpan.isDefined, true)
+        assertEquals(testSpan.isDefined, true)
+        assertEquals(results.size, 1)
+        assertEquals(suiteExecution.seen, 1L)
+        assertEquals(suiteExecution.passed, 1L)
+        assertEquals(suiteExecution.failed, 0L)
+    }
+  }
+
   private def emptyStream[A]: fs2.Stream[IO, A] =
     fs2.Stream.empty
 
@@ -78,4 +123,11 @@ object TestEngineTests:
     engine: TestEngine[IO]
   )
 
+  class G1 extends TestGroup[IO]:
+    override def name: String = "single-passing-test"
+
+    test(pid"engine:g1", "show that true is true") {
+      check(true).isTrueT()
+    }
+
 end TestEngineTests

modules/test-support/src/test/scala/support/TestEntryPoint.scala

@@ -8,6 +8,7 @@ import natchez.Kernel
 import natchez.Span
 import natchez.Span.Options
 
+// TODO: This doesn't account for multiple spans with the same name.
 final class TestEntryPoint private (
   spans: MapRef[IO, String, Option[TestSpan]]
 ) extends EntryPoint[IO]: