pangram: add starter implementation and make object-based (#344)

Pangrams is currently the third exercise in the new ordering therefore
it should have a starter implementation.

* make object-orientated
* add starter implementation
* rename class to PangramChecker

exercises/pangram/src/example/java/Pangrams.java → exercises/pangram/src/example/java/PangramChecker.java

@@ -1,11 +1,13 @@
 import java.util.Arrays;
 import java.util.stream.Collectors;
 
-public class Pangrams {
+public class PangramChecker {
     private static final int alphaLength = 26;
 
-    public static boolean isPangram(String input){
-        return Arrays.stream(input.replaceAll("[^a-zA-Z]","").toLowerCase().split(""))
+    public boolean isPangram(String input) {
+        return Arrays.stream(input.replaceAll("[^a-zA-Z]", "")
+                .toLowerCase()
+                .split(""))
                 .collect(Collectors.toSet())
                 .size() == alphaLength;
     }

exercises/pangram/src/main/java/PangramChecker.java

@@ -0,0 +1,6 @@
+public class PangramChecker {
+
+    public boolean isPangram(String input) {
+        throw new UnsupportedOperationException("Method has not been implemented yet.");
+    }
+}

exercises/pangram/src/test/java/PangramCheckerTest.java

@@ -0,0 +1,82 @@
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class PangramCheckerTest {
+    private PangramChecker pangramChecker;
+
+    @Before
+    public void setup() {
+        pangramChecker = new PangramChecker();
+    }
+
+
+    @Test
+    public void emptySentenceIsNotPangram() {
+        assertFalse(pangramChecker.isPangram(""));
+    }
+
+    @Ignore
+    @Test
+    public void pangramWithOnlyLowerCaseLettersIsRecognizedAsPangram() {
+        assertTrue(pangramChecker.isPangram("the quick brown fox jumps over the lazy dog"));
+    }
+
+    @Ignore
+    @Test
+    public void phraseMissingCharacterXIsNotPangram() {
+        assertFalse(pangramChecker.isPangram("a quick movement of the enemy will jeopardize five gunboats"));
+    }
+
+    @Ignore
+    @Test
+    public void anotherPhraseMissingCharacterXIsNotPangram() {
+        assertFalse(pangramChecker.isPangram("the quick brown fish jumps over the lazy dog"));
+    }
+
+    @Ignore
+    @Test
+    public void pangramWithUnderscoresIsRecognizedAsPangram() {
+        assertTrue(pangramChecker.isPangram("\"the_quick_brown_fox_jumps_over_the_lazy_dog\""));
+    }
+
+    @Ignore
+    @Test
+    public void pangramWithNumbersIsRecognizedAsPangram() {
+        assertTrue(pangramChecker.isPangram("\"the 1 quick brown fox jumps over the 2 lazy dogs\""));
+    }
+
+    @Ignore
+    @Test
+    public void phraseWithMissingLettersReplacedByNumbersIsNotPangram() {
+        assertFalse(pangramChecker.isPangram("\"7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog\""));
+    }
+
+    @Ignore
+    @Test
+    public void pangramWithMixedCaseAndPunctuationIsRecognizedAsPangram() {
+        assertTrue(pangramChecker.isPangram("\"Five quacking Zephyrs jolt my wax bed.\""));
+    }
+
+    @Ignore
+    @Test
+    public void pangramWithNonAsciiCharactersIsRecognizedAsPangram() {
+        assertTrue(pangramChecker.isPangram("Victor jagt zwölf Boxkämpfer quer über den großen Sylter Deich."));
+    }
+
+
+    @Ignore
+    @Test
+    public void panagramInAlphabetOtherThanAsciiIsNotRecognizedAsPangram() {
+        assertFalse(pangramChecker.isPangram("Широкая электрификация южных губерний даст мощный толчок подъёму сельского хозяйства."));
+    }
+
+    @Ignore
+    @Test
+    public void upperAndLowerCaseVersionsOfTheSameCharacterShouldNotBeCountedSeparately() {
+        assertFalse(pangramChecker.isPangram("the quick brown fox jumped over the lazy FOX"));
+    }
+}