Add vertical line test feature

Author: mapu77

src/main/java/edu/thoughtworks/training/Asterisk.java

@@ -13,4 +13,8 @@ public String print(int n) {
  for (int i=0; i<n; ++i) builder.append(print());
  return builder.toString();
  }
+
+ public String printVerticalLine(int n) {
+ return null;
+ }
 }

src/test/java/edu/thoughtworks/training/AsteriskShould.java

@@ -18,4 +18,14 @@ public void printANumberOfAsterisk() {
  assertEquals("Asterisk prints less than two asterisks", "******", asterisk.print(n));
  }
 
+ @Test
+ public void printAVerticalLineOfAsterisks() {
+ Asterisk asterisk = new Asterisk();
+ int n = 3;
+ assertEquals("Asterisk are not printed in a vertical line",
+ "*\n" +
+ "*\n" +
+ "*\n",
+ asterisk.printVerticalLine(n));
+ }
 }