diff --git a/tests/Unit/InternalNodeTest.php b/tests/Unit/InternalNodeTest.php
index dbf9273..ee30ae1 100644
--- a/tests/Unit/InternalNodeTest.php
+++ b/tests/Unit/InternalNodeTest.php
@@ -7,6 +7,8 @@
 
 class InternalNodeTest extends TestCase
 {
+    private $internal_node;
+
     protected function setUp()
     {
         $this->internal_node = new InternalNode(3, 5);
diff --git a/tests/Unit/LeafNodeTest.php b/tests/Unit/LeafNodeTest.php
index 339e31f..8707804 100644
--- a/tests/Unit/LeafNodeTest.php
+++ b/tests/Unit/LeafNodeTest.php
@@ -7,6 +7,8 @@
 
 class LeafNodeTest extends TestCase
 {
+    private $leaf_node;
+
     protected function setUp()
     {
         $this->leaf_node = new LeafNode(7, 8, 2);
diff --git a/tests/Unit/RootNodeTest.php b/tests/Unit/RootNodeTest.php
index 654146b..9a1e691 100644
--- a/tests/Unit/RootNodeTest.php
+++ b/tests/Unit/RootNodeTest.php
@@ -7,6 +7,8 @@
 
 class RootNodeTest extends TestCase
 {
+    private $root_node;
+
     protected function setUp()
     {
         $this->root_node = new RootNode;
diff --git a/tests/Unit/SuffixTreeTest.php b/tests/Unit/SuffixTreeTest.php
new file mode 100644
index 0000000..60d1700
--- /dev/null
+++ b/tests/Unit/SuffixTreeTest.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace Shrink0r\SuffixTree\Tests\Unit;
+
+use Shrink0r\SuffixTree\Builder\SuffixTreeBuilder;
+use Shrink0r\SuffixTree\Tests\Unit\TestCase;
+
+class SuffixTreeTest extends TestCase
+{
+    private $tree_builder;
+
+    protected function setUp()
+    {
+        $this->tree_builder = new SuffixTreeBuilder;
+    }
+
+    /**
+     * @dataProvider provideFlowFixtures
+     */
+    public function testOverallFlow(string $s, string $lrs, array $suffix, array $substring)
+    {
+        $suffix_tree = $this->tree_builder->build($s);
+        $this->assertEquals($lrs, $suffix_tree->findLongestRepetition());
+        $this->assertTrue($suffix_tree->hasSuffix($suffix['true']));
+        $this->assertFalse($suffix_tree->hasSuffix($suffix['false']));
+        $this->assertTrue($suffix_tree->hasSubstring($substring['true']));
+        $this->assertFalse($suffix_tree->hasSubstring($substring['false']));
+    }
+
+    /**
+     * @codeCoverageIgnore
+     */
+    public static function provideFlowFixtures()
+    {
+        return [
+            [
+                's' => 'mississippi$',
+                'lrs' => 'issi',
+                'suffix' => [ 'true' => 'sippi$', 'false' => 'miss$' ],
+                'substring' => [ 'true' => 'iss', 'false' => 'issm' ]
+            ],
+            [
+                's' => 'GEEKSFORGEEKS$',
+                'lrs' => 'GEEKS',
+                'suffix' => [ 'true' => 'EKS$', 'false' => 'GE$' ],
+                'substring' => [ 'true' => 'EEK', 'false' => 'SKG' ]
+            ],
+            [
+                's' => 'xabxac$',
+                'lrs' => 'xa',
+                'suffix' => [ 'true' => 'ac$', 'false' => 'xa$' ],
+                'substring' => [ 'true' => 'bxa', 'false' => 'cba' ]
+            ]
+        ];
+    }
+}