Merge pull request #405 from FridaTveit/TwelveDaysUseInstanceMethod

twelve-days: use instance methods [Fix #357]

exercises/twelve-days/src/example/java/TwelveDays.java

 public class TwelveDays {
-    private static String[] days = new String[] {"first", "second", "third", "fourth", "fifth", "sixth", "seventh",
-        "eighth", "ninth", "tenth", "eleventh", "twelfth"};
-    private static String[] gifts = new String[] {
+    private static String[] days = new String[]{"first", "second", "third", "fourth", "fifth", "sixth", "seventh",
+            "eighth", "ninth", "tenth", "eleventh", "twelfth"};
+    private static String[] gifts = new String[]{
             "a Partridge in a Pear Tree.",
             "two Turtle Doves, ",
             "three French Hens, ",
             "twelve Drummers Drumming, "
     };
 
-    public static String verse(int verseNumber) {
-        return constructVerse(verseNumber);
+    public String verse(int verseNumber) {
+        StringBuilder stringBuilder = new StringBuilder("On the " + days[verseNumber - 1]
+                + " day of Christmas my true love gave to me, ");
+        for (int i = verseNumber; i > 0; i--) {
+            if (verseNumber != 1 && i == 1) stringBuilder.append("and ");
+            stringBuilder.append(gifts[i - 1]);
+        }
+        stringBuilder.append("\n");
+        return stringBuilder.toString();
     }
 
-    public static String verses(int verseNumberStart, int verseNumberEnd) {
-        StringBuilder stringBuilder = new StringBuilder(constructVerse(verseNumberStart));
+    public String verses(int verseNumberStart, int verseNumberEnd) {
+        StringBuilder stringBuilder = new StringBuilder(verse(verseNumberStart));
         for (int i = verseNumberStart + 1; i <= verseNumberEnd; i++) {
             stringBuilder.append("\n");
-            stringBuilder.append(constructVerse(i));
+            stringBuilder.append(verse(i));
         }
         return stringBuilder.toString();
     }
 
-    public static String sing() {
+    public String sing() {
         return verses(1, 12);
     }
-
-    private static String constructVerse(int verseNumber) {
-        StringBuilder stringBuilder = new StringBuilder("On the " + days[verseNumber - 1]
-                + " day of Christmas my true love gave to me, ");
-        for (int i = verseNumber; i > 0; i--) {
-            if (verseNumber != 1 && i == 1) stringBuilder.append("and ");
-            stringBuilder.append(gifts[i - 1]);
-        }
-        stringBuilder.append("\n");
-        return stringBuilder.toString();
-    }
 }

exercises/twelve-days/src/test/java/TwelveDaysTest.java

+import org.junit.Before;
 import org.junit.Ignore;
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
 
 public class TwelveDaysTest {
+    private TwelveDays twelveDays;
+
+    @Before
+    public void setup() {
+        twelveDays = new TwelveDays();
+    }
 
     @Test
     public void testVerseOne() {
         String expectedVerseOne = "On the first day of Christmas my true love gave to me, " +
                 "a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseOne, TwelveDays.verse(1));
+        assertEquals(expectedVerseOne, twelveDays.verse(1));
     }
 
     @Ignore
     public void testVerseTwo() {
         String expectedVerseTwo = "On the second day of Christmas my true love gave to me, two Turtle Doves, " +
                 "and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseTwo, TwelveDays.verse(2));
+        assertEquals(expectedVerseTwo, twelveDays.verse(2));
     }
 
     @Ignore
     public void testVerseThree() {
         String expectedVerseThree = "On the third day of Christmas my true love gave to me, three French Hens, " +
                 "two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseThree, TwelveDays.verse(3));
+        assertEquals(expectedVerseThree, twelveDays.verse(3));
     }
 
     @Ignore
     public void testVerseFour() {
         String expectedVerseFour = "On the fourth day of Christmas my true love gave to me, four Calling Birds, " +
                 "three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseFour, TwelveDays.verse(4));
+        assertEquals(expectedVerseFour, twelveDays.verse(4));
     }
 
     @Ignore
     public void testVerseFive() {
         String expectedVerseFive = "On the fifth day of Christmas my true love gave to me, five Gold Rings, " +
                 "four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseFive, TwelveDays.verse(5));
+        assertEquals(expectedVerseFive, twelveDays.verse(5));
     }
 
     @Ignore
         String expectedVerseSix = "On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, " +
                 "five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, " +
                 "and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseSix, TwelveDays.verse(6));
+        assertEquals(expectedVerseSix, twelveDays.verse(6));
     }
 
     @Ignore
         String expectedVerseSeven = "On the seventh day of Christmas my true love gave to me, " +
                 "seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, " +
                 "two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseSeven, TwelveDays.verse(7));
+        assertEquals(expectedVerseSeven, twelveDays.verse(7));
     }
 
     @Ignore
         String expectedVerseEight = "On the eighth day of Christmas my true love gave to me, eight Maids-a-Milking," +
                 " seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, " +
                 "three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseEight, TwelveDays.verse(8));
+        assertEquals(expectedVerseEight, twelveDays.verse(8));
     }
 
     @Ignore
         String expectedVerseNine = "On the ninth day of Christmas my true love gave to me, nine Ladies Dancing, " +
                 "eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, " +
                 "four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseNine, TwelveDays.verse(9));
+        assertEquals(expectedVerseNine, twelveDays.verse(9));
     }
 
     @Ignore
                 "nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, " +
                 "five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, " +
                 "and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseTen, TwelveDays.verse(10));
+        assertEquals(expectedVerseTen, twelveDays.verse(10));
     }
 
     @Ignore
                 "eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, " +
                 "seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, " +
                 "three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseEleven, TwelveDays.verse(11));
+        assertEquals(expectedVerseEleven, twelveDays.verse(11));
     }
 
     @Ignore
                 "twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, " +
                 "eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, " +
                 "four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseTwelve, TwelveDays.verse(12));
+        assertEquals(expectedVerseTwelve, twelveDays.verse(12));
     }
 
     @Ignore
                 "and a Partridge in a Pear Tree.\n\n" +
                 "On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, " +
                 "and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedVerseOneToThree, TwelveDays.verses(1, 3));
+        assertEquals(expectedVerseOneToThree, twelveDays.verses(1, 3));
     }
 
     @Ignore
                 "eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, " +
                 "seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, " +
                 "three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
-        assertEquals(expectedSong, TwelveDays.sing());
+        assertEquals(expectedSong, twelveDays.sing());
     }
 }