String calculator second edition

.gitlab-ci.yml

@@ -12,3 +12,4 @@ include:
   - local: "/java-pagination-seven/.gitlab-ci.yml"
   - local: "/a-brief-history-of-date/.gitlab-ci.yml"
   - local: "/mustache-replacer/.gitlab-ci.yml"
+  - local: "/string-calculator-2/.gitlab-ci.yml"

README.md

@@ -30,5 +30,6 @@ Ce dépôt Git a pour but de partager les différents ateliers pouvant être ré
 | [GreenIT: simple coup de peinture ou réelle démarche écologique ?](https://www.youtube.com/watch?v=liTuZZTCpGc)       | Discussion  |            |
 | [Une annonce pour recruter un crafter - Caroline, Chloé, Ianic et Colin](https://www.youtube.com/watch?v=E5AX6Ar1Fog) | Discussion  |            |
 | [PadBowl](https://gitlab.com/cdamon/padbowl)                                                                          | Application | Enervé     |
-| [A Brief History of Date](/a-brief-history-of-date)                                                                   | Kata        | Moyen      |
+| [A Brief History of Date](/a-brief-history-of-date)                                                                   | Kata        | Moyenne    |
 | [Mustache Replacer](/mustache-replacer)                                                                               | Kata        | Facile     |
+| [String calculator 2](/string-calculator-2)                                                                           | Kata        | Moyenne    |

string-calculator-2/.gitlab-ci.yml

+package-string-calculator:
+  variables:
+    PROJECT_FOLDER: "string-calculator-2"
+  extends: .java
+  only:
+    refs:
+      - master
+      - merge_requests
+    changes:
+      - ".gitlab-common-ci.yml"
+      - "string-calculator-2/**/*"

string-calculator-2/README.md

+# String calculator
+
+Résolution, en live, de [StringCalculator](/stringCalculator).
+
+-   **Auteurs** : Colin DAMON
+-   **Date** : 06/11/2020
+-   **Langage** : Java
+-   **Niveau** : Moyen
+-   **Replay** : TODO

string-calculator-2/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<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/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <version>1.0.0</version>
+    <groupId>fr.ippon.kata</groupId>
+    <artifactId>java-parent</artifactId>
+    <relativePath>../java-parent</relativePath>
+  </parent>
+
+  <version>1.0.0-SNAPSHOT</version>
+  <artifactId>string-calculator-2</artifactId>
+
+  <name>StringCalculator2</name>
+
+  <developers>
+    <developer>
+      <email>cdamon@ippon.fr</email>
+      <name>Colin DAMON</name>
+    </developer>
+  </developers>
+</project>

string-calculator-2/src/main/java/fr/ippon/stringcalculator/StringCalculator.java

+package fr.ippon.stringcalculator;
+
+import java.math.BigDecimal;
+import java.util.Arrays;
+
+public final class StringCalculator {
+  private static final String SEPARATOR = ",|\n";
+
+  private StringCalculator() {}
+
+  public static String sum(String numbers) {
+    if (noNumbers(numbers)) {
+      return "0";
+    }
+
+    return Arrays.stream(numbers.split(SEPARATOR)).map(BigDecimal::new).reduce(BigDecimal.ZERO, BigDecimal::add).toPlainString();
+  }
+
+  private static boolean noNumbers(String numbers) {
+    return numbers == null || numbers.isBlank();
+  }
+}

string-calculator-2/src/test/java/fr/ippon/stringcalculator/StringCalculatorTest.java

+package fr.ippon.stringcalculator;
+
+import static fr.ippon.stringcalculator.StringCalculator.*;
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+public class StringCalculatorTest {
+
+  @Test
+  void shouldSumToZeroFromNullNumbers() {
+    assertThat(sum(null)).isEqualTo("0");
+  }
+
+  @Test
+  void shouldSumToZeroFromEmptyNumbers() {
+    assertThat(sum("")).isEqualTo("0");
+  }
+
+  @Test
+  void shouldSumToFourFromFour() {
+    assertThat(sum("4")).isEqualTo("4");
+  }
+
+  @Test
+  void shouldSumFourAndTwo() {
+    assertThat(sum("4,2")).isEqualTo("6");
+  }
+
+  @Test
+  void shouldSumOneZeroOneAndTwoZeroTwo() {
+    assertThat(sum("1.01,2.02")).isEqualTo("3.03");
+  }
+
+  @Test
+  void shouldUseNewlinesAsSeparator() {
+    assertThat(sum("1\n2,3")).isEqualTo("6");
+  }
+}