diff --git a/src/ResourceComparator.php b/src/ResourceComparator.php
index 5471826..11ba8c2 100644
--- a/src/ResourceComparator.php
+++ b/src/ResourceComparator.php
@@ -40,7 +40,7 @@ public function accepts($expected, $actual)
      */
     public function assertEquals($expected, $actual, $delta = 0.0, $canonicalize = false, $ignoreCase = false)
     {
-        if ($actual != $expected) {
+        if ($this->asString($actual) !== $this->asString($expected)) {
             throw new ComparisonFailure(
                 $expected,
                 $actual,
@@ -49,4 +49,29 @@ public function assertEquals($expected, $actual, $delta = 0.0, $canonicalize = f
             );
         }
     }
+
+    private function asString($resource)
+    {
+        if ('stream' !== \get_resource_type($resource)) {
+            return (string) $resource;
+        }
+
+        $metaData = \stream_get_meta_data($resource);
+
+        if (!\preg_match('(a\+|c\+|r|w\+|x\+)', $metaData['mode'])) {
+            return (string) $resource;
+        }
+
+        $position = \ftell($resource);
+        \rewind($resource);
+
+        $context = \hash_init('md5');
+        \hash_update_stream($context, $resource);
+
+        if (\is_int($position)) {
+            \fseek($resource, $position);
+        }
+
+        return \hash_final($context);
+    }
 }
diff --git a/tests/ResourceComparatorTest.php b/tests/ResourceComparatorTest.php
index 158aaa9..a8c794e 100644
--- a/tests/ResourceComparatorTest.php
+++ b/tests/ResourceComparatorTest.php
@@ -56,22 +56,76 @@ public function acceptsFailsProvider()
     public function assertEqualsSucceedsProvider()
     {
         $tmpfile1 = \tmpfile();
+        \fwrite($tmpfile1, 'foo');
         $tmpfile2 = \tmpfile();
+        \fwrite($tmpfile2, 'foo');
+        $tmpfile3 = \fopen(\tempnam(\sys_get_temp_dir(), ''), 'a+');
+        \fwrite($tmpfile3, 'foo');
+        $tmpfile4 = \fopen(\sys_get_temp_dir().'/'.\uniqid('', true), 'x+');
+        \fwrite($tmpfile4, 'foo');
+        $tmpfile5 = \fopen(\tempnam(\sys_get_temp_dir(), ''), 'c+');
+        \fwrite($tmpfile5, 'foo');
+
+        $memory1 = \fopen('php://memory', 'r+');
+        \fwrite($memory1, 'foo');
+        $memory2 = \fopen('php://memory', 'w+');
+        \fwrite($memory2, 'foo');
+
+        $image1 = \imagecreate(100, 100);
+        $image2 = \imagecreate(100, 100);
 
         return [
             [$tmpfile1, $tmpfile1],
-            [$tmpfile2, $tmpfile2]
+            [$tmpfile2, $tmpfile2],
+            [$tmpfile1, $tmpfile2],
+            [$tmpfile2, $tmpfile1],
+            [$tmpfile1, $tmpfile3],
+            [$tmpfile3, $tmpfile1],
+            [$tmpfile1, $tmpfile4],
+            [$tmpfile4, $tmpfile1],
+            [$tmpfile1, $tmpfile5],
+            [$tmpfile5, $tmpfile1],
+            [$tmpfile1, $memory1],
+            [$memory1, $tmpfile1],
+            [$memory1, $memory1],
+            [$memory2, $memory2],
+            [$memory1, $memory2],
+            [$memory2, $memory1],
+            [$image1, $image1],
+            [$image2, $image2]
         ];
     }
 
     public function assertEqualsFailsProvider()
     {
         $tmpfile1 = \tmpfile();
+        \fwrite($tmpfile1, 'foo');
         $tmpfile2 = \tmpfile();
+        $tmpfile3 = \fopen(\tempnam(\sys_get_temp_dir(), ''), 'a');
+        $tmpfile4 = \fopen(\sys_get_temp_dir().'/'.\uniqid('', true), 'x');
+        $tmpfile5 = \fopen(\tempnam(\sys_get_temp_dir(), ''), 'c');
+
+        $memory1 = \fopen('php://memory', 'r+');
+        \fwrite($memory1, 'foo');
+        $memory2 = \fopen('php://memory', 'r+');
+        \fwrite($memory2, 'bar');
+
+        $image1 = \imagecreate(100, 100);
+        $image2 = \imagecreate(100, 100);
 
         return [
             [$tmpfile1, $tmpfile2],
-            [$tmpfile2, $tmpfile1]
+            [$tmpfile2, $tmpfile1],
+            [$tmpfile2, $tmpfile3],
+            [$tmpfile3, $tmpfile2],
+            [$tmpfile2, $tmpfile4],
+            [$tmpfile4, $tmpfile2],
+            [$tmpfile2, $tmpfile5],
+            [$tmpfile5, $tmpfile2],
+            [$memory1, $memory2],
+            [$memory2, $memory1],
+            [$image1, $image2],
+            [$image2, $image1]
         ];
     }