diff --git a/.gitignore b/.gitignore
index 0c084f8..a7dc592 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,7 @@
 *.iml
 .idea
 .DS_Store
-target
\ No newline at end of file
+target
+.classpath
+.project
+.settings/
\ No newline at end of file
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..76fbf04
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,6 @@
+coverage:
+  status:
+    project:
+      default:
+        # basic
+        target: 100%
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 759fad7..32ecf5d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,100 +1,96 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
-    <modelVersion>4.0.0</modelVersion>
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+	<modelVersion>4.0.0</modelVersion>
 
 
-    <groupId>se.cygni</groupId>
-    <artifactId>ci-tdd-java-template</artifactId>
-    <version>1..00-SNAPSHOT</version>
+	<groupId>se.cygni</groupId>
+	<artifactId>ci-tdd-java-template</artifactId>
+	<version>1..00-SNAPSHOT</version>
 
-    <name>ci-tdd-java-template</name>
+	<name>ci-tdd-java-template</name>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <java.version>1.8</java.version>
-        <junit.jupiter.version>5.1.0</junit.jupiter.version>
-        <junit.platform.version>1.1.0</junit.platform.version>
-    </properties>
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+		<java.version>1.8</java.version>
+		<junit.jupiter.version>5.1.0</junit.jupiter.version>
+		<junit.platform.version>1.1.0</junit.platform.version>
+	</properties>
 
 
-    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.12</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>3.9.0</version>
-            <scope>test</scope>
-        </dependency>
+	<dependencies>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.12</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<version>3.9.0</version>
+			<scope>test</scope>
+		</dependency>
 
-    </dependencies>
+	</dependencies>
 
-    <build>
-        <plugins>
-            <plugin>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.7.0</version>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                </configuration>
-            </plugin>
-            <plugin>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.19.1</version>
-                <configuration>
-                    <!--suppress MavenModelInspection -->
-                    <argLine>${surefireArgLine}</argLine>
-                    <includes>
-                        <include>**/Test*.java</include>
-                        <include>**/*Test.java</include>
-                        <include>**/*Tests.java</include>
-                        <include>**/*TestCase.java</include>
-                    </includes>
-                </configuration>
-            </plugin>
-            <plugin>
-                <!-- https://mvnrepository.com/artifact/org.jacoco/jacoco-maven-plugin -->
-                <groupId>org.jacoco</groupId>
-                <artifactId>jacoco-maven-plugin</artifactId>
-                <version>0.8.0</version>
-                <executions>
-                    <!--
-                        Prepares the property pointing to the JaCoCo runtime agent which
-                        is passed as VM argument when Maven the Surefire plugin is executed.
-                    -->
-                    <execution>
-                        <id>pre-unit-test</id>
-                        <goals>
-                            <goal>prepare-agent</goal>
-                        </goals>
-                        <configuration>
-                            <destFile>${project.build.directory}/coverage-reports/jacoco-ut.exec</destFile>
-                            <propertyName>surefireArgLine</propertyName>
-                        </configuration>
-                    </execution>
-                    <!--
-                        Ensures that the code coverage report for unit tests is created after
-                        unit tests have been run.
-                    -->
-                    <execution>
-                        <id>post-unit-test</id>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>report</goal>
-                        </goals>
-                        <configuration>
-                            <dataFile>${project.build.directory}/coverage-reports/jacoco-ut.exec</dataFile>
-                            <outputDirectory>${project.reporting.outputDirectory}/jacoco-ut</outputDirectory>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
+	<build>
+		<plugins>
+			<plugin>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.7.0</version>
+				<configuration>
+					<source>${java.version}</source>
+					<target>${java.version}</target>
+				</configuration>
+			</plugin>
+			<plugin>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>2.19.1</version>
+				<configuration>
+					<!--suppress MavenModelInspection -->
+					<argLine>${surefireArgLine}</argLine>
+					<includes>
+						<include>**/Test*.java</include>
+						<include>**/*Test.java</include>
+						<include>**/*Tests.java</include>
+						<include>**/*TestCase.java</include>
+					</includes>
+				</configuration>
+			</plugin>
+			<plugin>
+				<!-- https://mvnrepository.com/artifact/org.jacoco/jacoco-maven-plugin -->
+				<groupId>org.jacoco</groupId>
+				<artifactId>jacoco-maven-plugin</artifactId>
+				<version>0.8.0</version>
+				<executions>
+					<!-- Prepares the property pointing to the JaCoCo runtime agent which 
+						is passed as VM argument when Maven the Surefire plugin is executed. -->
+					<execution>
+						<id>pre-unit-test</id>
+						<goals>
+							<goal>prepare-agent</goal>
+						</goals>
+						<configuration>
+							<destFile>${project.build.directory}/coverage-reports/jacoco-ut.exec</destFile>
+							<propertyName>surefireArgLine</propertyName>
+						</configuration>
+					</execution>
+					<!-- Ensures that the code coverage report for unit tests is created 
+						after unit tests have been run. -->
+					<execution>
+						<id>post-unit-test</id>
+						<phase>package</phase>
+						<goals>
+							<goal>report</goal>
+						</goals>
+						<configuration>
+							<dataFile>${project.build.directory}/coverage-reports/jacoco-ut.exec</dataFile>
+							<outputDirectory>${project.reporting.outputDirectory}/jacoco-ut</outputDirectory>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
 </project>
diff --git a/src/main/java/se/cygni/palmithor/tdd/StringUtils.java b/src/main/java/se/cygni/palmithor/tdd/StringUtils.java
index 3b36d6b..9c612f8 100644
--- a/src/main/java/se/cygni/palmithor/tdd/StringUtils.java
+++ b/src/main/java/se/cygni/palmithor/tdd/StringUtils.java
@@ -1,20 +1,27 @@
 package se.cygni.palmithor.tdd;
 
-public class StringUtils {
-
+import java.util.stream.IntStream;
 
-    public boolean isPalindrome(final String str) {
-        throw new RuntimeException("Not yet implemented");
-    }
+public class StringUtils {
 
+	public boolean isPalindrome(final String str) {
+		if(str != null) {
+		String temp  = str.replaceAll("\\s+", "").toLowerCase();
+	    return IntStream.range(0, temp.length() / 2)
+	      .noneMatch(i -> temp.charAt(i) != temp.charAt(temp.length() - i - 1));
+		}
+		return false;
+	}
 
-    /**
-     * 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) {
+		return str == null || str.trim().length() == 0;
+	}
 }
diff --git a/src/test/java/se/cygni/palmithor/tdd/CalculatorTest.java b/src/test/java/se/cygni/palmithor/tdd/CalculatorTest.java
index ed4264e..0302120 100644
--- a/src/test/java/se/cygni/palmithor/tdd/CalculatorTest.java
+++ b/src/test/java/se/cygni/palmithor/tdd/CalculatorTest.java
@@ -13,7 +13,12 @@ public class CalculatorTest {
 
     @Test
     public void test() {
-        //assertThat(calculator.sumAll().get()).isEqualTo(1); // fail un purpose
+        assertThat(calculator.sumAll(1).get()).isEqualTo(1); // TODO failing on purpose please fix
+        assertThat(calculator.sumAll(1,3).get()).isEqualTo(4);
+        assertThat(calculator.sumAll().get()).isEqualTo(0);
+        assertThat(calculator.sumAll(null).isPresent()).isFalse();
+        
+        
     }
 
 
diff --git a/src/test/java/se/cygni/palmithor/tdd/StringUtilsTest.java b/src/test/java/se/cygni/palmithor/tdd/StringUtilsTest.java
index 09cabc4..595bc1f 100644
--- a/src/test/java/se/cygni/palmithor/tdd/StringUtilsTest.java
+++ b/src/test/java/se/cygni/palmithor/tdd/StringUtilsTest.java
@@ -11,14 +11,12 @@ public class StringUtilsTest {
 
     @Test
     public void isPalindrome() {
-        /*
         assertThat(stringUtils.isPalindrome("aabb")).isFalse();
         assertThat(stringUtils.isPalindrome(null)).isFalse();
         assertThat(stringUtils.isPalindrome("NotEvenClose")).isFalse();
         assertThat(stringUtils.isPalindrome("")).isTrue();
         assertThat(stringUtils.isPalindrome("abba")).isTrue();
         assertThat(stringUtils.isPalindrome("tattarrattat")).isTrue();
-        */
     }
 
     /**
@@ -26,6 +24,9 @@ public void isPalindrome() {
      */
     @Test
     public void isBlank() {
-        // stringUtils.isBlank()
+        assertThat(stringUtils.isBlank("")).isTrue();
+        assertThat(stringUtils.isBlank("NotEmpty")).isFalse();
+        assertThat(stringUtils.isBlank(null)).isTrue();
+        assertThat(stringUtils.isBlank(" ")).isTrue();
     }
 }
\ No newline at end of file