Merge pull request #93 from macieg/scala-55

SCALA-55

Author: KevinGilmore

scala-lang/src/test/scala/com/baeldung/scala/CaseClasses.scala

@@ -0,0 +1,44 @@
+package com.baeldung.scala
+
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+case class CovidCountryStats(countryCode: String, deaths: Int, confirmedCases: Int)
+
+class CaseClassesUnitTest {
+  @Test
+  def givenCaseClass_whenPatternMatched_thenReturnsProperValue() = {
+    val covidPL = CovidCountryStats("PL", 776, 15366)
+
+    val text = covidPL matches {
+      case CovidCountryStats("PL", x, y) => "Death rate for Poland is " + x.toFloat / y.toFloat
+      case _ => "Unknown country"
+    }
+
+    assertEquals("Death rate for Poland is 0.05050111", text)
+  }
+
+  @Test
+  def givenTwoEqualsCaseClasses_whenCheckingEquality_thenReturnsTrue(): Unit = {
+    assert(CovidCountryStats("PL", 776, 15366) == CovidCountryStats("PL", 776, 15366))
+  }
+
+  @Test
+  def givenCaseClass_whenCallingCopy_thenParametersAreCopied(): Unit = {
+    val covidPL = CovidCountryStats("PL", 776, 15366)
+    val covidUA = covidPL.copy(countryCode = "UA")
+
+    assertEquals("UA", covidUA.countryCodeo)
+    assertEquals(766, covidUA.deaths)
+    assertEquals(15366, covidUA.confirmedCases)
+  }
+
+  @Test
+  def givenTuple_whenCallingApply_thenCreatesNewInstance() = {
+    val tuple = ("PL", 776, 15366)
+    val covidPL = (CovidCountryStats.apply _).tupled(tuple)
+
+    assertEquals(CovidCountryStats("PL", 776, 15366), covidPL)
+  }
+}