SCALA-38 (#8548)

core-scala/src/test/scala/com/baeldung/scala/RegexUnitTest.scala

@@ -0,0 +1,73 @@
+package com.baeldung.scala
+
+import org.junit.Test
+import org.junit.Assert.assertEquals
+
+class RegexUnitTest {
+  private val polishPostalCode = "([0-9]{2})\\-([0-9]{3})".r
+  private val timestamp = "([0-9]{2}):([0-9]{2}):([0-9]{2}).([0-9]{3})".r
+  private val timestampUnanchored = timestamp.unanchored
+
+  @Test
+  def givenRegularExpression_whenCallingFindFirstIn_thenShouldFindCorrectMatches(): Unit = {
+    val postCode = polishPostalCode.findFirstIn("Warsaw 01-011, Jerusalem Avenue")
+    assertEquals(Some("01-011"), postCode)
+  }
+
+  @Test
+  def givenRegularExpression_whenCallingFindFirstMatchIn_thenShouldFindCorrectMatches(): Unit = {
+    val postCodes = polishPostalCode.findFirstMatchIn("Warsaw 01-011, Jerusalem Avenue")
+    assertEquals(Some("011"), for (m <- postCodes) yield m.group(2))
+  }
+
+  @Test
+  def givenRegularExpression_whenCallingFindAllIn_thenShouldFindCorrectMatches(): Unit = {
+    val postCodes = polishPostalCode.findAllIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
+      .toList
+    assertEquals(List("01-011", "30-059"), postCodes)
+
+    polishPostalCode.findAllIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
+  }
+
+  @Test
+  def givenRegularExpression_whenCallingFindAlMatchlIn_thenShouldFindCorrectMatches(): Unit = {
+    val postCodes = polishPostalCode.findAllMatchIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
+      .toList
+    val postalDistricts = for (m <- postCodes) yield m.group(1)
+    assertEquals(List("01", "30"), postalDistricts)
+  }
+
+  @Test
+  def givenRegularExpression_whenExtractingValues_thenShouldExtractCorrectValues(): Unit = {
+    val description = "11:34:01.411" match {
+      case timestamp(hour, minutes, _, _) => s"It's $minutes minutes after $hour"
+    }
+
+    assertEquals("It's 34 minutes after 11", description)
+  }
+
+  @Test
+  def givenUnanchoredRegularExpression_whenExtractingValues_thenShouldExtractCorrectValues(): Unit = {
+    val description = "Timestamp: 11:34:01.411 error appeared" match {
+      case timestampUnanchored(hour, minutes, _, _) => s"It's $minutes minutes after $hour"
+    }
+
+    assertEquals("It's 34 minutes after 11", description)
+  }
+
+  @Test
+  def givenRegularExpression_whenCallingReplaceAllIn_thenShouldReplaceText(): Unit = {
+    val minutes = timestamp.replaceAllIn("11:34:01.311", m => m.group(2))
+
+    assertEquals("34", minutes)
+  }
+
+  @Test
+  def givenRegularExpression_whenCallingReplaceAllInWithMatcher_thenShouldReplaceText(): Unit = {
+    val secondsThatDayInTotal = timestamp.replaceAllIn("11:34:01.311", _ match {
+      case timestamp(hours, minutes, seconds, _) => s"$hours-$minutes"
+    })
+
+    assertEquals("11-34", secondsThatDayInTotal)
+  }
+}