example: add a CI pipeline for gradle (#862) (#963)

examples/gradle/build.gradle

@@ -0,0 +1,19 @@
+apply plugin: 'java'
+
+repositories {
+    jcenter()
+}
+
+dependencies {
+    testImplementation('junit:junit:4.13')
+}
+
+jar {
+    archiveBaseName = 'StringApp'
+    archiveVersion =  '0.1.0'
+      manifest {
+    attributes(
+      'Main-Class': 'StringApp'
+    )
+  }
+}

examples/gradle/ci.yml

@@ -0,0 +1,8 @@
+steps:
+- id: assemble
+  uses: docker://gradle:openj9
+  runs: [gradle, assemble]
+
+- id: test
+  uses: docker://gradle:openj9
+  runs: [gradle, test]

examples/gradle/src/main/java/StringApp.java

@@ -0,0 +1,7 @@
+public class StringApp {
+  public static void main(String[] args) {
+      StringManipulator strManipulator = new StringManipulator();
+      System.out.println("Concatenating strings.");
+      System.out.println("\"one\" + \"two\" -> " + strManipulator.concatenate("one","two"));
+  }
+}

examples/gradle/src/main/java/StringManipulator.java

@@ -0,0 +1,5 @@
+public class StringManipulator {
+    public String concatenate(String one, String two){
+        return one + two;
+    }
+}

examples/gradle/src/test/java/StringTester.java

@@ -0,0 +1,15 @@
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class StringTester {
+
+    @Test
+    public void testConcatenate() {
+        StringManipulator myUnit = new StringManipulator();
+
+        String result = myUnit.concatenate("one", "two");
+
+        assertEquals("onetwo", result);
+
+    }
+}