Replace assert.deepEqual() by assert.deepStrictEqual()

test/support/assert.js

@@ -237,7 +237,7 @@ assert.utfgridEqualsFile = function (buffer, file_b, tolerance, callback) {
             throw new Error(celldiff.length + ' cell differences: ' + celldiff);
         }
 
-        assert.deepEqual(obtained_json.keys, expected_json.keys);
+        assert.deepStrictEqual(obtained_json.keys, expected_json.keys);
     } catch (e) { err = e; }
 
     callback(err);

test/support/test-helper.js

@@ -72,7 +72,7 @@ function checkSurrogateKey (res, expectedKey) {
     var keys = res.headers['surrogate-key'].split(' ').reduce(createSet, {});
     var expectedKeys = expectedKey.split(' ').reduce(createSet, {});
 
-    assert.deepEqual(keys, expectedKeys);
+    assert.deepStrictEqual(keys, expectedKeys);
 }
 
 var uncaughtExceptions = [];