Implements Tags endpoints for Shaarli's REST API

Endpoints:

 * List All Tags [GET]
 * Get a tag [GET]
 * Update a tag [PUT]
 * Delete a tag [DELETE]

Fixes #904
References shaarli/api-documentation#34

11 files changed, 711 insertions, 0 deletions

diff --git a/tests/api/controllers/HistoryTest.php b/tests/api/controllers/history/HistoryTest.php
index 61046d97..61046d97 100644
--- a/tests/api/controllers/HistoryTest.php
+++ b/tests/api/controllers/history/HistoryTest.php
diff --git a/tests/api/controllers/InfoTest.php b/tests/api/controllers/info/InfoTest.php
index f7e63bfa..f7e63bfa 100644
--- a/tests/api/controllers/InfoTest.php
+++ b/tests/api/controllers/info/InfoTest.php
diff --git a/tests/api/controllers/DeleteLinkTest.php b/tests/api/controllers/links/DeleteLinkTest.php
index 7d797137..7d797137 100644
--- a/tests/api/controllers/DeleteLinkTest.php
+++ b/tests/api/controllers/links/DeleteLinkTest.php
diff --git a/tests/api/controllers/GetLinkIdTest.php b/tests/api/controllers/links/GetLinkIdTest.php
index 57528d5a..57528d5a 100644
--- a/tests/api/controllers/GetLinkIdTest.php
+++ b/tests/api/controllers/links/GetLinkIdTest.php
diff --git a/tests/api/controllers/GetLinksTest.php b/tests/api/controllers/links/GetLinksTest.php
index d22ed3bf..d22ed3bf 100644
--- a/tests/api/controllers/GetLinksTest.php
+++ b/tests/api/controllers/links/GetLinksTest.php
diff --git a/tests/api/controllers/PostLinkTest.php b/tests/api/controllers/links/PostLinkTest.php
index 100a9170..100a9170 100644
--- a/tests/api/controllers/PostLinkTest.php
+++ b/tests/api/controllers/links/PostLinkTest.php
diff --git a/tests/api/controllers/PutLinkTest.php b/tests/api/controllers/links/PutLinkTest.php
index 8a562571..8a562571 100644
--- a/tests/api/controllers/PutLinkTest.php
+++ b/tests/api/controllers/links/PutLinkTest.php
diff --git a/tests/api/controllers/tags/DeleteTagTest.php b/tests/api/controllers/tags/DeleteTagTest.php
new file mode 100644
index 00000000..7ba5a862
--- /dev/null
+++ b/tests/api/controllers/tags/DeleteTagTest.php
@@ -0,0 +1,164 @@
+<?php
+
+
+namespace Shaarli\Api\Controllers;
+
+use Shaarli\Config\ConfigManager;
+use Slim\Container;
+use Slim\Http\Environment;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+class DeleteTagTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var string datastore to test write operations
+     */
+    protected static $testDatastore = 'sandbox/datastore.php';
+
+    /**
+     * @var string datastore to test write operations
+     */
+    protected static $testHistory = 'sandbox/history.php';
+
+    /**
+     * @var ConfigManager instance
+     */
+    protected $conf;
+
+    /**
+     * @var \ReferenceLinkDB instance.
+     */
+    protected $refDB = null;
+
+    /**
+     * @var \LinkDB instance.
+     */
+    protected $linkDB;
+
+    /**
+     * @var \History instance.
+     */
+    protected $history;
+
+    /**
+     * @var Container instance.
+     */
+    protected $container;
+
+    /**
+     * @var Tags controller instance.
+     */
+    protected $controller;
+
+    /**
+     * Before each test, instantiate a new Api with its config, plugins and links.
+     */
+    public function setUp()
+    {
+        $this->conf = new ConfigManager('tests/utils/config/configJson');
+        $this->refDB = new \ReferenceLinkDB();
+        $this->refDB->write(self::$testDatastore);
+        $this->linkDB = new \LinkDB(self::$testDatastore, true, false);
+        $refHistory = new \ReferenceHistory();
+        $refHistory->write(self::$testHistory);
+        $this->history = new \History(self::$testHistory);
+        $this->container = new Container();
+        $this->container['conf'] = $this->conf;
+        $this->container['db'] = $this->linkDB;
+        $this->container['history'] = $this->history;
+
+        $this->controller = new Tags($this->container);
+    }
+
+    /**
+     * After each test, remove the test datastore.
+     */
+    public function tearDown()
+    {
+        @unlink(self::$testDatastore);
+        @unlink(self::$testHistory);
+    }
+
+    /**
+     * Test DELETE tag endpoint: the tag should be removed.
+     */
+    public function testDeleteTagValid()
+    {
+        $tagName = 'gnu';
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertTrue($tags[$tagName] > 0);
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'DELETE',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $response = $this->controller->deleteTag($request, new Response(), ['tagName' => $tagName]);
+        $this->assertEquals(204, $response->getStatusCode());
+        $this->assertEmpty((string) $response->getBody());
+
+        $this->linkDB = new \LinkDB(self::$testDatastore, true, false);
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertFalse(isset($tags[$tagName]));
+
+        // 2 links affected
+        $historyEntry = $this->history->getHistory()[0];
+        $this->assertEquals(\History::UPDATED, $historyEntry['event']);
+        $this->assertTrue(
+            (new \DateTime())->add(\DateInterval::createFromDateString('-5 seconds')) < $historyEntry['datetime']
+        );
+        $historyEntry = $this->history->getHistory()[1];
+        $this->assertEquals(\History::UPDATED, $historyEntry['event']);
+        $this->assertTrue(
+            (new \DateTime())->add(\DateInterval::createFromDateString('-5 seconds')) < $historyEntry['datetime']
+        );
+    }
+
+    /**
+     * Test DELETE tag endpoint: the tag should be removed.
+     */
+    public function testDeleteTagCaseSensitivity()
+    {
+        $tagName = 'sTuff';
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertTrue($tags[$tagName] > 0);
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'DELETE',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $response = $this->controller->deleteTag($request, new Response(), ['tagName' => $tagName]);
+        $this->assertEquals(204, $response->getStatusCode());
+        $this->assertEmpty((string) $response->getBody());
+
+        $this->linkDB = new \LinkDB(self::$testDatastore, true, false);
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertFalse(isset($tags[$tagName]));
+        $this->assertTrue($tags[strtolower($tagName)] > 0);
+
+        $historyEntry = $this->history->getHistory()[0];
+        $this->assertEquals(\History::UPDATED, $historyEntry['event']);
+        $this->assertTrue(
+            (new \DateTime())->add(\DateInterval::createFromDateString('-5 seconds')) < $historyEntry['datetime']
+        );
+    }
+
+    /**
+     * Test DELETE link endpoint: reach not existing ID.
+     *
+     * @expectedException Shaarli\Api\Exceptions\ApiTagNotFoundException
+     * @expectedExceptionMessage Tag not found
+     */
+    public function testDeleteLink404()
+    {
+        $tagName = 'nopenope';
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertFalse(isset($tags[$tagName]));
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'DELETE',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $this->controller->deleteTag($request, new Response(), ['tagName' => $tagName]);
+    }
+}
diff --git a/tests/api/controllers/tags/GetTagNameTest.php b/tests/api/controllers/tags/GetTagNameTest.php
new file mode 100644
index 00000000..d60f5b38
--- /dev/null
+++ b/tests/api/controllers/tags/GetTagNameTest.php
@@ -0,0 +1,129 @@
+<?php
+
+namespace Shaarli\Api\Controllers;
+
+use Shaarli\Config\ConfigManager;
+
+use Slim\Container;
+use Slim\Http\Environment;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class GetTagNameTest
+ *
+ * Test getTag by tag name API service.
+ *
+ * @package Shaarli\Api\Controllers
+ */
+class GetTagNameTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var string datastore to test write operations
+     */
+    protected static $testDatastore = 'sandbox/datastore.php';
+
+    /**
+     * @var ConfigManager instance
+     */
+    protected $conf;
+
+    /**
+     * @var \ReferenceLinkDB instance.
+     */
+    protected $refDB = null;
+
+    /**
+     * @var Container instance.
+     */
+    protected $container;
+
+    /**
+     * @var Tags controller instance.
+     */
+    protected $controller;
+
+    /**
+     * Number of JSON fields per link.
+     */
+    const NB_FIELDS_TAG = 2;
+
+    /**
+     * Before each test, instantiate a new Api with its config, plugins and links.
+     */
+    public function setUp()
+    {
+        $this->conf = new ConfigManager('tests/utils/config/configJson');
+        $this->refDB = new \ReferenceLinkDB();
+        $this->refDB->write(self::$testDatastore);
+
+        $this->container = new Container();
+        $this->container['conf'] = $this->conf;
+        $this->container['db'] = new \LinkDB(self::$testDatastore, true, false);
+        $this->container['history'] = null;
+
+        $this->controller = new Tags($this->container);
+    }
+
+    /**
+     * After each test, remove the test datastore.
+     */
+    public function tearDown()
+    {
+        @unlink(self::$testDatastore);
+    }
+
+    /**
+     * Test basic getTag service: return gnu tag with 2 occurrences.
+     */
+    public function testGetTag()
+    {
+        $tagName = 'gnu';
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'GET',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $response = $this->controller->getTag($request, new Response(), ['tagName' => $tagName]);
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data));
+        $this->assertEquals($tagName, $data['name']);
+        $this->assertEquals(2, $data['occurrences']);
+    }
+
+    /**
+     * Test getTag service which is not case sensitive: occurrences with both sTuff and stuff
+     */
+    public function testGetTagNotCaseSensitive()
+    {
+        $tagName = 'sTuff';
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'GET',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $response = $this->controller->getTag($request, new Response(), ['tagName' => $tagName]);
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data));
+        $this->assertEquals($tagName, $data['name']);
+        $this->assertEquals(2, $data['occurrences']);
+    }
+
+    /**
+     * Test basic getLink service: get non existent link => ApiLinkNotFoundException.
+     *
+     * @expectedException Shaarli\Api\Exceptions\ApiTagNotFoundException
+     * @expectedExceptionMessage Tag not found
+     */
+    public function testGetTag404()
+    {
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'GET',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $this->controller->getTag($request, new Response(), ['tagName' => 'nopenope']);
+    }
+}
diff --git a/tests/api/controllers/tags/GetTagsTest.php b/tests/api/controllers/tags/GetTagsTest.php
new file mode 100644
index 00000000..cf066bc3
--- /dev/null
+++ b/tests/api/controllers/tags/GetTagsTest.php
@@ -0,0 +1,209 @@
+<?php
+namespace Shaarli\Api\Controllers;
+
+use Shaarli\Config\ConfigManager;
+
+use Slim\Container;
+use Slim\Http\Environment;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class GetTagsTest
+ *
+ * Test get tag list REST API service.
+ *
+ * @package Shaarli\Api\Controllers
+ */
+class GetTagsTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var string datastore to test write operations
+     */
+    protected static $testDatastore = 'sandbox/datastore.php';
+
+    /**
+     * @var ConfigManager instance
+     */
+    protected $conf;
+
+    /**
+     * @var \ReferenceLinkDB instance.
+     */
+    protected $refDB = null;
+
+    /**
+     * @var Container instance.
+     */
+    protected $container;
+
+    /**
+     * @var \LinkDB instance.
+     */
+    protected $linkDB;
+
+    /**
+     * @var Tags controller instance.
+     */
+    protected $controller;
+
+    /**
+     * Number of JSON field per link.
+     */
+    const NB_FIELDS_TAG = 2;
+
+    /**
+     * Before every test, instantiate a new Api with its config, plugins and links.
+     */
+    public function setUp()
+    {
+        $this->conf = new ConfigManager('tests/utils/config/configJson');
+        $this->refDB = new \ReferenceLinkDB();
+        $this->refDB->write(self::$testDatastore);
+
+        $this->container = new Container();
+        $this->container['conf'] = $this->conf;
+        $this->linkDB = new \LinkDB(self::$testDatastore, true, false);
+        $this->container['db'] = $this->linkDB;
+        $this->container['history'] = null;
+
+        $this->controller = new Tags($this->container);
+    }
+
+    /**
+     * After every test, remove the test datastore.
+     */
+    public function tearDown()
+    {
+        @unlink(self::$testDatastore);
+    }
+
+    /**
+     * Test basic getLinks service: returns all tags.
+     */
+    public function testGetTagsAll()
+    {
+        $tags = $this->linkDB->linksCountPerTag();
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'GET',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $response = $this->controller->getTags($request, new Response());
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEquals(count($tags), count($data));
+
+        // Check order
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data[0]));
+        $this->assertEquals('web', $data[0]['name']);
+        $this->assertEquals(4, $data[0]['occurrences']);
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data[1]));
+        $this->assertEquals('cartoon', $data[1]['name']);
+        $this->assertEquals(3, $data[1]['occurrences']);
+        // Case insensitive
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data[2]));
+        $this->assertEquals('sTuff', $data[2]['name']);
+        $this->assertEquals(2, $data[2]['occurrences']);
+        // End
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data[count($data) - 1]));
+        $this->assertEquals('ut', $data[count($data) - 1]['name']);
+        $this->assertEquals(1, $data[count($data) - 1]['occurrences']);
+    }
+
+    /**
+     * Test getTags service with offset and limit parameter:
+     *   limit=1 and offset=1 should return only the second tag, cartoon with 3 occurrences
+     */
+    public function testGetTagsOffsetLimit()
+    {
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'GET',
+            'QUERY_STRING' => 'offset=1&limit=1'
+        ]);
+        $request = Request::createFromEnvironment($env);
+        $response = $this->controller->getTags($request, new Response());
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEquals(1, count($data));
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data[0]));
+        $this->assertEquals('cartoon', $data[0]['name']);
+        $this->assertEquals(3, $data[0]['occurrences']);
+    }
+
+    /**
+     * Test getTags with limit=all (return all tags).
+     */
+    public function testGetTagsLimitAll()
+    {
+        $tags = $this->linkDB->linksCountPerTag();
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'GET',
+            'QUERY_STRING' => 'limit=all'
+        ]);
+        $request = Request::createFromEnvironment($env);
+        $response = $this->controller->getTags($request, new Response());
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEquals(count($tags), count($data));
+    }
+
+    /**
+     * Test getTags service with offset and limit parameter:
+     *   limit=1 and offset=1 should not return any tag
+     */
+    public function testGetTagsOffsetTooHigh()
+    {
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'GET',
+            'QUERY_STRING' => 'offset=100'
+        ]);
+        $request = Request::createFromEnvironment($env);
+        $response = $this->controller->getTags($request, new Response());
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEmpty(count($data));
+    }
+
+    /**
+     * Test getTags with visibility parameter set to private
+     */
+    public function testGetTagsVisibilityPrivate()
+    {
+        $tags = $this->linkDB->linksCountPerTag([], 'private');
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'GET',
+            'QUERY_STRING' => 'visibility=private'
+        ]);
+        $request = Request::createFromEnvironment($env);
+        $response = $this->controller->getTags($request, new Response());
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEquals(count($tags), count($data));
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data[0]));
+        $this->assertEquals('css', $data[0]['name']);
+        $this->assertEquals(1, $data[0]['occurrences']);
+    }
+
+    /**
+     * Test getTags with visibility parameter set to public
+     */
+    public function testGetTagsVisibilityPublic()
+    {
+        $tags = $this->linkDB->linksCountPerTag([], 'public');
+        $env = Environment::mock(
+            [
+                'REQUEST_METHOD' => 'GET',
+                'QUERY_STRING' => 'visibility=public'
+            ]
+        );
+        $request = Request::createFromEnvironment($env);
+        $response = $this->controller->getTags($request, new Response());
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string)$response->getBody(), true);
+        $this->assertEquals(count($tags), count($data));
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data[0]));
+        $this->assertEquals('web', $data[0]['name']);
+        $this->assertEquals(3, $data[0]['occurrences']);
+    }
+}
diff --git a/tests/api/controllers/tags/PutTagTest.php b/tests/api/controllers/tags/PutTagTest.php
new file mode 100644
index 00000000..6f7dec22
--- /dev/null
+++ b/tests/api/controllers/tags/PutTagTest.php
@@ -0,0 +1,209 @@
+<?php
+
+
+namespace Shaarli\Api\Controllers;
+
+
+use Shaarli\Api\Exceptions\ApiBadParametersException;
+use Shaarli\Config\ConfigManager;
+use Slim\Container;
+use Slim\Http\Environment;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+class PutTagTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var string datastore to test write operations
+     */
+    protected static $testDatastore = 'sandbox/datastore.php';
+
+    /**
+     * @var string datastore to test write operations
+     */
+    protected static $testHistory = 'sandbox/history.php';
+
+    /**
+     * @var ConfigManager instance
+     */
+    protected $conf;
+
+    /**
+     * @var \ReferenceLinkDB instance.
+     */
+    protected $refDB = null;
+
+    /**
+     * @var \History instance.
+     */
+    protected $history;
+
+    /**
+     * @var Container instance.
+     */
+    protected $container;
+
+    /**
+     * @var \LinkDB instance.
+     */
+    protected $linkDB;
+
+    /**
+     * @var Tags controller instance.
+     */
+    protected $controller;
+
+    /**
+     * Number of JSON field per link.
+     */
+    const NB_FIELDS_TAG = 2;
+
+    /**
+     * Before every test, instantiate a new Api with its config, plugins and links.
+     */
+    public function setUp()
+    {
+        $this->conf = new ConfigManager('tests/utils/config/configJson.json.php');
+        $this->refDB = new \ReferenceLinkDB();
+        $this->refDB->write(self::$testDatastore);
+
+        $refHistory = new \ReferenceHistory();
+        $refHistory->write(self::$testHistory);
+        $this->history = new \History(self::$testHistory);
+
+        $this->container = new Container();
+        $this->container['conf'] = $this->conf;
+        $this->linkDB = new \LinkDB(self::$testDatastore, true, false);
+        $this->container['db'] = $this->linkDB;
+        $this->container['history'] = $this->history;
+
+        $this->controller = new Tags($this->container);
+    }
+
+    /**
+     * After every test, remove the test datastore.
+     */
+    public function tearDown()
+    {
+        @unlink(self::$testDatastore);
+        @unlink(self::$testHistory);
+    }
+
+    /**
+     * Test tags update
+     */
+    public function testPutLinkValid()
+    {
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'PUT',
+        ]);
+        $tagName = 'gnu';
+        $update = ['name' => $newName = 'newtag'];
+        $request = Request::createFromEnvironment($env);
+        $request = $request->withParsedBody($update);
+
+        $response = $this->controller->putTag($request, new Response(), ['tagName' => $tagName]);
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data));
+        $this->assertEquals($newName, $data['name']);
+        $this->assertEquals(2, $data['occurrences']);
+
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertNotTrue(isset($tags[$tagName]));
+        $this->assertEquals(2, $tags[$newName]);
+
+        $historyEntry = $this->history->getHistory()[0];
+        $this->assertEquals(\History::UPDATED, $historyEntry['event']);
+        $this->assertTrue(
+            (new \DateTime())->add(\DateInterval::createFromDateString('-5 seconds')) < $historyEntry['datetime']
+        );
+        $historyEntry = $this->history->getHistory()[1];
+        $this->assertEquals(\History::UPDATED, $historyEntry['event']);
+        $this->assertTrue(
+            (new \DateTime())->add(\DateInterval::createFromDateString('-5 seconds')) < $historyEntry['datetime']
+        );
+    }
+
+    /**
+     * Test tag update with an existing tag: they should be merged
+     */
+    public function testPutTagMerge()
+    {
+        $tagName = 'gnu';
+        $newName = 'w3c';
+
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertEquals(1, $tags[$newName]);
+        $this->assertEquals(2, $tags[$tagName]);
+
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'PUT',
+        ]);
+        $update = ['name' => $newName];
+        $request = Request::createFromEnvironment($env);
+        $request = $request->withParsedBody($update);
+
+        $response = $this->controller->putTag($request, new Response(), ['tagName' => $tagName]);
+        $this->assertEquals(200, $response->getStatusCode());
+        $data = json_decode((string) $response->getBody(), true);
+        $this->assertEquals(self::NB_FIELDS_TAG, count($data));
+        $this->assertEquals($newName, $data['name']);
+        $this->assertEquals(3, $data['occurrences']);
+
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertNotTrue(isset($tags[$tagName]));
+        $this->assertEquals(3, $tags[$newName]);
+    }
+
+    /**
+     * Test tag update with an empty new tag name => ApiBadParametersException
+     *
+     * @expectedException Shaarli\Api\Exceptions\ApiBadParametersException
+     * @expectedExceptionMessage New tag name is required in the request body
+     */
+    public function testPutTagEmpty()
+    {
+        $tagName = 'gnu';
+        $newName = '';
+
+        $tags = $this->linkDB->linksCountPerTag();
+        $this->assertEquals(2, $tags[$tagName]);
+
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'PUT',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'PUT',
+        ]);
+        $update = ['name' => $newName];
+        $request = Request::createFromEnvironment($env);
+        $request = $request->withParsedBody($update);
+
+        try {
+            $this->controller->putTag($request, new Response(), ['tagName' => $tagName]);
+        } catch (ApiBadParametersException $e) {
+            $tags = $this->linkDB->linksCountPerTag();
+            $this->assertEquals(2, $tags[$tagName]);
+            throw $e;
+        }
+    }
+
+    /**
+     * Test tag update on non existent tag => ApiTagNotFoundException.
+     *
+     * @expectedException Shaarli\Api\Exceptions\ApiTagNotFoundException
+     * @expectedExceptionMessage Tag not found
+     */
+    public function testPutTag404()
+    {
+        $env = Environment::mock([
+            'REQUEST_METHOD' => 'PUT',
+        ]);
+        $request = Request::createFromEnvironment($env);
+
+        $this->controller->putTag($request, new Response(), ['tagName' => 'nopenope']);
+    }
+}