SCALA-626: Add unit test for Trait Parameter and Multiple Inheritance

Author: Tapan Avasthi

scala-core/build.sbt

@@ -0,0 +1,6 @@
+// Scala 3 configuration
+lazy val Scala3Test = config("scala3Test").extend(Test)
+// Source directories
+scalaSource in Scala3Test := baseDirectory.value / "src" / "main" / "scala-3"
+// Test directories
+scalaSource in Scala3Test := baseDirectory.value / "src" / "test" / "scala-3"

scala-core/src/main/scala-3/com/baeldung/scala/traits/Author.scala

@@ -0,0 +1,5 @@
+package com.baeldung.scala.traits
+
+class Author(name: String) extends Writer(name) {
+  def write(): String = s"$name is writing a book"
+}

scala-core/src/main/scala-3/com/baeldung/scala/traits/MultipleInheritance.scala

@@ -0,0 +1,15 @@
+package com.baeldung.scala.traits
+
+class MultipleInheritance extends Trait1 with Trait2 {
+  override def method1(): String = "Trait1 method"
+
+  override def method2(): String = "Trait2 method"
+}
+
+trait Trait1 {
+  def method1(): String
+}
+
+trait Trait2 {
+  def method2(): String
+}

scala-core/src/main/scala-3/com/baeldung/scala/traits/Poet.scala

@@ -0,0 +1,5 @@
+package com.baeldung.scala.traits
+
+class Poet(name: String) extends Writer(name) {
+  def write(): String = s"$name is composing poetry"
+}

scala-core/src/main/scala-3/com/baeldung/scala/traits/Writer.scala

@@ -0,0 +1,7 @@
+package com.baeldung.scala.traits
+
+trait Writer(val name: String) {
+  def introduce = s"Hello, I'm $name"
+
+  def write(): String
+}

scala-core/src/test/scala-3/com/baeldung/scala/traits/MultipleInheritanceUnitTest.scala

@@ -0,0 +1,14 @@
+package com.baeldung.scala.traits
+
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class MultipleInheritanceUnitTest extends AnyFlatSpec with Matchers {
+
+  "A class extended from multiple traits" should "have access to all the methods" in {
+    val instance = new MultipleInheritance()
+
+    instance.method1() shouldEqual "Trait1 method"
+    instance.method2() shouldEqual "Trait2 method"
+  }
+}

scala-core/src/test/scala-3/com/baeldung/scala/traits/TraitParametersUnitTest.scala

@@ -0,0 +1,21 @@
+package com.baeldung.scala.traits
+
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class TraitParametersUnitTest extends AnyFlatSpec with Matchers {
+
+  "An Author" should "return a proper introduction" in {
+    val author = new Author("Mark Twain")
+    val introduction = author.introduce
+
+    introduction shouldEqual "Hello, I'm Mark Twain"
+  }
+
+  "A Poet" should "return a proper introduction" in {
+    val poet = new Poet("Sylvia Plath")
+    val introduction = poet.introduce
+
+    introduction shouldEqual "Hello, I'm Sylvia Plath"
+  }
+}