feat: introduce spark example IT

examples/apache-spark/pom.xml

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+<?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>
+        <groupId>org.neo4j.importer</groupId>
+        <artifactId>import-spec-examples-parent</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <artifactId>apache-spark-example</artifactId>
+    <name>apache-spark-example</name>
+    <properties>
+        <scala.version>2.13</scala.version>
+        <surefire.jvm.args>-XX:+IgnoreUnrecognizedVMOptions
+            --add-opens=java.base/java.lang=ALL-UNNAMED
+            --add-opens=java.base/java.lang.invoke=ALL-UNNAMED
+            --add-opens=java.base/java.lang.reflect=ALL-UNNAMED
+            --add-opens=java.base/java.io=ALL-UNNAMED
+            --add-opens=java.base/java.net=ALL-UNNAMED
+            --add-opens=java.base/java.nio=ALL-UNNAMED
+            --add-opens=java.base/java.util=ALL-UNNAMED
+            --add-opens=java.base/java.util.concurrent=ALL-UNNAMED
+            --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED
+            --add-opens=java.base/sun.nio.ch=ALL-UNNAMED
+            --add-opens=java.base/sun.nio.cs=ALL-UNNAMED
+            --add-opens=java.base/sun.security.action=ALL-UNNAMED
+            --add-opens=java.base/sun.util.calendar=ALL-UNNAMED
+            --add-opens=java.security.jgss/sun.security.krb5=ALL-UNNAMED
+            -Djdk.reflect.useDirectMethodHandle=false</surefire.jvm.args>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.google.cloud.bigdataoss</groupId>
+            <artifactId>gcs-connector</artifactId>
+            <version>hadoop3-2.2.11</version>
+            <classifier>shaded</classifier>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.spark</groupId>
+            <artifactId>spark-sql_${scala.version}</artifactId>
+            <version>3.5.7</version>
+        </dependency>
+        <dependency>
+            <groupId>org.neo4j</groupId>
+            <artifactId>neo4j-connector-apache-spark_${scala.version}</artifactId>
+            <version>5.3.10_for_spark_3</version>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>import-spec</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.cloud</groupId>
+            <artifactId>google-cloud-nio</artifactId>
+            <version>0.128.7</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-nop</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>neo4j</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>testcontainers</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-failsafe-plugin</artifactId>
+                <configuration>
+                    <argLine>${surefire.jvm.args}</argLine>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>run-example</id>
+                        <goals>
+                            <goal>integration-test</goal>
+                            <goal>verify</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

examples/apache-spark/src/test/java/org/neo4j/importer/CompletableFutures.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) "Neo4j"
+ * Neo4j Sweden AB [https://neo4j.com]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.neo4j.importer;
+
+import java.util.concurrent.CompletableFuture;
+
+class CompletableFutures {
+
+    public static <T> CompletableFuture<T> initial() {
+        return CompletableFuture.completedFuture(null);
+    }
+
+    public static CompletableFuture<Void> mergeSequential(
+            CompletableFuture<Void> chain1, CompletableFuture<Void> chain2) {
+        return chain1.thenCompose(v -> chain2);
+    }
+
+    public static CompletableFuture<Void> mergeParallel(
+            CompletableFuture<Void> chain1, CompletableFuture<Void> chain2) {
+        return CompletableFuture.allOf(chain1, chain2);
+    }
+}