BAEL-2480 Java Map to String conversion (#6075)

* BAEL-2480 Java Map to String conversion

* BAEL-2480 Java Map to String conversion

* BAEL-2480 Java Map to String conversion

* BAEL-2480 Java Map to String conversion

java-collections-maps/src/test/java/com/baeldung/convert/StringToMapUnitTest.java

@@ -0,0 +1,23 @@
+package com.baeldung.convert;
+
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+public class StringToMapUnitTest {
+
+    @Test
+    public void givenString_WhenUsingStream_ThenResultingStringIsCorrect() {
+        Map<String, String> wordsByKey = StringToMap.convertWithStream("1=one,2=two,3=three,4=four");
+        Assert.assertEquals(4, wordsByKey.size());
+        Assert.assertEquals("one", wordsByKey.get("1"));
+    }
+
+    @Test
+    void givenString_WhenUsingGuava_ThenResultingStringIsCorrect() {
+        Map<String, String> wordsByKey = StringToMap.convertWithGuava("1=one,2=two,3=three,4=four");
+        Assert.assertEquals(4, wordsByKey.size());
+        Assert.assertEquals("one", wordsByKey.get("1"));
+    }
+}