Add tests

composer.json

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+{
+    "require-dev": {
+        "biblibre/omeka-s-test-helper": "dev-master"
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "IdRefTest\\": "test/IdRefTest/"
+        }
+    }
+}

test/IdRefTest/Controller/Admin/IdRefControllerTest.php

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+<?php
+
+namespace IdRefTest\Controller;
+
+use OmekaTestHelper\Controller\OmekaControllerTestCase;
+
+class IdRefControllerTest extends OmekaControllerTestCase
+{
+    public function setup()
+    {
+        parent::setup();
+        $this->loginAsAdmin();
+    }
+
+    public function testSearchAction()
+    {
+        $this->dispatch('/admin/idref/search?term=hugo');
+        $this->assertResponseStatusCode(200);
+        $this->assertResponseHeaderContains('Content-Type', 'application/json; charset=utf-8');
+
+        $results = json_decode($this->getResponse()->getContent());
+        $this->assertNotNull($results);
+        $this->assertTrue(is_array($results));
+    }
+}

test/bootstrap.php

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+<?php
+
+require __DIR__ . '/../vendor/autoload.php';
+
+use OmekaTestHelper\Bootstrap;
+
+Bootstrap::bootstrap(__DIR__);
+Bootstrap::loginAsAdmin();
+Bootstrap::enableModule('IdRef');

test/phpunit.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit bootstrap="./bootstrap.php" colors="true" backupGlobals="false">
+    <testsuites>
+        <testsuite name="IdRef">
+            <directory>./IdRefTest</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>