add test for right triangle feature

Author: albadc

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

@@ -19,4 +19,8 @@ public String printVerticalLine(int n) {
  for (int i = 0; i < n; ++i) builder.append(printAnAsterisk()).append("\n");
  return builder.toString();
  }
+
+ public String printRightTriangle(int n) {
+ return null;
+ }
 }

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

@@ -28,4 +28,11 @@ public void printAVerticalLineOfAsterisks() {
  "*\n",
  asterisk.printVerticalLine(n));
  }
+
+ @Test
+ public void printRightTriangle() {
+ Asterisk asterisk = new Asterisk();
+ int n = 3;
+ assertEquals("Asterisks not printed in a right triangle", "*\n" + "**\n" + "***\n", asterisk.printRightTriangle(n));
+ }
 }