Add some tests

build.gradle

@@ -13,6 +13,7 @@ repositories {
 }
 configurations {
     provided
+    runtime.exclude group: "org.slf4j", module: "slf4j-log4j12"
 }
 
 version = "0.2.1"
@@ -27,6 +28,8 @@ dependencies {
     compile "org.apache.hadoop:hadoop-aws:2.6.0"
 
     testCompile "junit:junit:4.+"
+    testCompile "org.embulk:embulk-core:0.7.7:tests"
+    testCompile "org.embulk:embulk-standards:0.7.7"
 }
 
 task classpath(type: Copy, dependsOn: ["jar"]) {

src/test/java/org/embulk/output/ParquetOutputPluginTest.java

@@ -0,0 +1,37 @@
+package org.embulk.output;
+
+import org.embulk.EmbulkTestRuntime;
+import org.embulk.config.ConfigException;
+import org.embulk.config.ConfigSource;
+import org.embulk.spi.Exec;
+import org.junit.Rule;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class ParquetOutputPluginTest {
+    @Rule
+    public EmbulkTestRuntime runtime = new EmbulkTestRuntime();
+
+    @Test
+    public void checkDefaultValues() {
+        ConfigSource config = Exec.newConfigSource()
+                .set("path_prefix", "test");
+
+        ParquetOutputPlugin.PluginTask task = config.loadConfig(ParquetOutputPlugin.PluginTask.class);
+        assertEquals(".parquet", task.getFileNameExtension());
+        assertEquals(".%03d", task.getSequenceFormat());
+        assertEquals(134217728, task.getBlockSize());
+        assertEquals(1048576, task.getPageSize());
+        assertEquals("UNCOMPRESSED", task.getCompressionCodec());
+    }
+
+    @Test(expected = ConfigException.class)
+    public void checkColumnsRequired() {
+        ConfigSource config = Exec.newConfigSource();
+
+        config.loadConfig(ParquetOutputPlugin.PluginTask.class);
+    }
+
+
+}