test \n null

src/main/java/se/cygni/palmithor/tdd/StringUtils.java

@@ -3,18 +3,26 @@
 public class StringUtils {
 
 
-    public boolean isPalindrome(final String str) {
-        throw new RuntimeException("Not yet implemented");
+  public boolean isPalindrome(final String str) {
+    if (str == null) {
+      return false;
     }
+    StringBuilder string = new StringBuilder(str);
+    return string.reverse().toString().equals(str);
+  }
 
 
-    /**
-     * Checks if a String is empty (""), null or whitespace only.
-     * @param str the string to check
-     *
-     * @return true if str is null, empty or whitespace only, otherwise false
-     */
-    public boolean isBlank(final String str) {
-        throw new RuntimeException("Not yet implemented");
+  /**
+   * Checks if a String is empty (""), null or whitespace only.
+   *
+   * @param str the string to check
+   * @return true if str is null, empty or whitespace only, otherwise false
+   */
+  public boolean isBlank(final String str) {
+    if (str == null ) {
+      return true;
     }
+    String trimmed = str.trim();
+    return trimmed.equals("");
+  }
 }

src/test/java/se/cygni/palmithor/tdd/CalculatorTest.java

@@ -12,9 +12,13 @@ public class CalculatorTest {
     private Calculator calculator = new Calculator();
 
     @Test
-    public void test() {
-        assertThat(calculator.sumAll().get()).isEqualTo(1); // TODO failing on purpose please fix
+    public void test()
+    {
+        assertThat(calculator.sumAll(1).get()).isEqualTo(1);
+        assertThat(calculator.sumAll(null)).isEqualTo(Optional.empty());
+        assertThat(calculator.sumAll().get()).isEqualTo(0);
+        assertThat(calculator.sumAll(1, 2, 3).get()).isEqualTo(6);
+        assertThat(calculator.sumAll(-1, -2, -3).get()).isEqualTo(-6);
+        assertThat(calculator.sumAll(-1, null, -3).get()).isEqualTo(-4);
     }
-
-
 }

src/test/java/se/cygni/palmithor/tdd/StringUtilsTest.java

@@ -23,6 +23,13 @@ public void isPalindrome() {
      */
     @Test
     public void isBlank() {
-        // stringUtils.isBlank()
+        assertThat(stringUtils.isBlank(null)).isTrue();
+        assertThat(stringUtils.isBlank("hej")).isFalse();
+        assertThat(stringUtils.isBlank("hej jon")).isFalse();
+        assertThat(stringUtils.isBlank("")).isTrue();
+        assertThat(stringUtils.isBlank(" ")).isTrue();
+        assertThat(stringUtils.isBlank("  ")).isTrue();
+        assertThat(stringUtils.isBlank(" _")).isFalse();
+        assertThat(stringUtils.isBlank("\n\t\r")).isTrue();
     }
 }