[BAEL-12899] - Splitted the java-strings module (#7410)

java-strings-ops/src/test/java/com/baeldung/string/SplitUnitTest.java

@@ -0,0 +1,72 @@
+package com.baeldung.string;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.api.Test;
+
+import com.google.common.base.Splitter;
+
+public class SplitUnitTest {
+
+    @Test
+    public void givenString_whenSplit_thenReturnsArray_through_JavaLangString() {
+        assertThat("peter,james,thomas".split(","))
+          .containsExactly("peter", "james", "thomas");
+
+        assertThat("car jeep scooter".split(" "))
+          .containsExactly("car", "jeep", "scooter");
+
+        assertThat("1-120-232323".split("-"))
+          .containsExactly("1", "120", "232323");
+
+        assertThat("192.168.1.178".split("\\."))
+          .containsExactly("192", "168", "1", "178");
+
+        assertThat("b a, e, l.d u, n g".split("\\s+|,\\s*|\\.\\s*"))
+          .containsExactly("b", "a", "e", "l", "d", "u", "n", "g");
+    }
+
+    @Test
+    public void givenString_whenSplit_thenReturnsArray_through_StringUtils() {
+        StringUtils.split("car jeep scooter");
+
+        assertThat(StringUtils.split("car jeep scooter"))
+          .containsExactly("car", "jeep", "scooter");
+
+        assertThat(StringUtils.split("car    jeep   scooter"))
+          .containsExactly("car", "jeep", "scooter");
+
+        assertThat(StringUtils.split("car:jeep:scooter", ":"))
+          .containsExactly("car", "jeep", "scooter");
+
+        assertThat(StringUtils.split("car.jeep.scooter", "."))
+          .containsExactly("car", "jeep", "scooter");
+    }
+
+    @Test
+    public void givenString_whenSplit_thenReturnsList_Splitter() {
+        //given
+        List<String> resultList = Splitter.on(',').trimResults().omitEmptyStrings().splitToList("car,jeep,,   scooter");
+
+        assertThat(resultList)
+          .containsExactly("car", "jeep", "scooter");
+    }
+    
+    @Test
+    public void givenStringContainsSpaces_whenSplitAndTrim_thenReturnsArray_using_Regex() {
+        assertThat(" car , jeep,  scooter ".trim()
+          .split("\\s*,\\s*")).containsExactly("car", "jeep", "scooter");
+
+    }
+    
+    @Test
+    public void givenStringContainsSpaces_whenSplitAndTrim_thenReturnsArray_using_java_8() {
+        assertThat(Arrays.stream(" car , jeep,  scooter ".split(","))
+          .map(String::trim)
+          .toArray(String[]::new)).containsExactly("car", "jeep", "scooter");
+    }   
+}