Add ConsoleHijackTest

Author: japgolly

library/project/Build.scala

@@ -251,7 +251,7 @@ object ScalaJsReact {
 
   lazy val util = project
     .dependsOn(utilFallbacks % Provided)
-    .configure(commonSettings, publicationSettings, hasNoTests, disableScalaDoc3, prohibitDefaultEffects)
+    .configure(commonSettings, publicationSettings, utestSettings, disableScalaDoc3, prohibitDefaultEffects)
     .settings(
       libraryDependencies += Dep.scalaJsDom.value,
     )

library/util/src/test/scala/japgolly/scalajs/react/util/ConsoleHijackTest.scala

@@ -0,0 +1,27 @@
+package japgolly.scalajs.react.util
+
+import org.scalajs.dom.console
+import scala.util.Try
+import utest._
+
+object ConsoleHijackTest extends TestSuite {
+
+  override def tests = Tests {
+    "catchReactWarnings" - {
+
+      def testPass[A](a: => A): A =
+        ConsoleHijack.fatalReactWarnings(a)
+
+      def testThrows(a: => Any): Unit = {
+        val t = Try(ConsoleHijack.fatalReactWarnings(a))
+        println(t)
+        assert(t.isFailure)
+      }
+
+      "error_hit"  - testThrows(console.error("Warning: this is a test"))
+      "error_miss" - testPass(console.error("this is a test"))
+      "warn_hit"  - testPass(console.warn("Warning: this is a test"))
+      "warn_miss" - testPass(console.warn("this is a test"))
+    }
+  }
+}