diff --git a/test/phpunit/ClientTest.php b/test/phpunit/ClientTest.php
index 0d49822..4cb287d 100644
--- a/test/phpunit/ClientTest.php
+++ b/test/phpunit/ClientTest.php
@@ -6,6 +6,7 @@
 use Gt\Fetch\Http;
 use Gt\Http\Response;
 use Gt\Json\JsonObject;
+use Gt\Json\JsonPrimitive\JsonArrayPrimitive;
 use Gt\Promise\Promise;
 use PHPUnit\Framework\TestCase;
 
@@ -52,4 +53,65 @@ public function testGetCustomer_byId():void {
 		self::assertSame("customer@example.com", $customer->email);
 		self::assertSame("07123456789", $customer->mobile);
 	}
+
+	public function testGetAllTags():void {
+		$username = "test-user";
+		$client = "test-client";
+		$secretKey = "super-secret-key";
+
+		$testCustomerId = "test-id-123";
+		$expectedUri = Client::BASE_URI . "/";
+		$expectedUri .= explode(" ", Endpoint::getAllTags->value)[1];
+		$expectedUri = str_replace("{client}", $client, $expectedUri);
+		$expectedUri = str_replace("{id}", $testCustomerId, $expectedUri);
+
+		$jsonTag1 = self::createMock(JsonObject::class);
+		$jsonTag1->method("getString")->willReturnMap([
+			["id", "id-1"],
+			["name", "name-1"],
+		]);
+		$jsonTag2 = self::createMock(JsonObject::class);
+		$jsonTag2->method("getString")->willReturnMap([
+			["id", "id-2"],
+			["name", "name-2"],
+		]);
+		$jsonTag3 = self::createMock(JsonObject::class);
+		$jsonTag3->method("getString")->willReturnMap([
+			["id", "id-3"],
+			["name", "name-3"],
+		]);
+
+		$json = self::createMock(JsonArrayPrimitive::class);
+		$json->method("getPrimitiveValue")->willReturn([
+			$jsonTag1,
+			$jsonTag2,
+			$jsonTag3,
+		]);
+
+		$response = self::createMock(Response::class);
+		$response->method("__get")->willReturnMap([
+			["ok", true],
+			["status", 200],
+		]);
+		$response->method("getStatusCode")->willReturn(200);
+		$response->expects(self::once())
+			->method("awaitJson")
+			->willReturn($json);
+
+		$fetchClient = self::createMock(Http::class);
+		$fetchClient->expects(self::once())
+			->method("awaitFetch")
+			->with($expectedUri)
+			->willReturn($response);
+
+		$sut = new Client($username, $client, $secretKey, $fetchClient);
+		$allTags = $sut->getAllTags();
+
+		self::assertCount(3, $allTags);
+		foreach($allTags as $i => $tag) {
+			$num = $i + 1;
+			self::assertSame("id-$num", $tag->id);
+			self::assertSame("name-$num", $tag->name);
+		}
+	}
 }