BAEL-1376: Varargs Code Example (#3129)

* BAEL-1376: Varargs Code Example

* BAEL-1376: Varargs Code Example

Moving the "logic" into a test and removing the unnecessary
class.

core-java/src/test/java/com/baeldung/varargs/FormatterTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.varargs;
+
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+public class FormatterTest {
+
+    private final static String FORMAT = "%s %s %s";
+
+    @Test
+    public void givenNoArgument_thenEmptyAndTwoSpacesAreReturned() {
+        String actualResult = format();
+
+        assertThat(actualResult, is("empty  "));
+    }
+
+    @Test
+    public void givenOneArgument_thenResultHasTwoTrailingSpace() {
+        String actualResult = format("baeldung");
+
+        assertThat(actualResult, is("baeldung  "));
+    }
+
+    @Test
+    public void givenTwoArguments_thenOneTrailingSpaceExists() {
+        String actualResult = format("baeldung", "rocks");
+
+        assertThat(actualResult, is("baeldung rocks "));
+    }
+
+    @Test
+    public void givenMoreThanThreeArguments_thenTheFirstThreeAreUsed() {
+        String actualResult = formatWithVarArgs("baeldung", "rocks", "java", "and", "spring");
+
+        assertThat(actualResult, is("baeldung rocks java"));
+    }
+
+    public String format() {
+        return format("empty", "");
+    }
+
+    public String format(String value) {
+        return format(value, "");
+    }
+
+    public String format(String val1, String val2) {
+        return String.format(FORMAT, val1, val2, "");
+    }
+
+    public String formatWithVarArgs(String... values) {
+        if (values.length == 0) {
+            return "no arguments given";
+        }
+
+        return String.format(FORMAT, values);
+    }
+
+}