diff --git a/src/parser/event_parser/grammar.rs b/src/parser/event_parser/grammar.rs
index e1f717714a..f26cbc4f66 100644
--- a/src/parser/event_parser/grammar.rs
+++ b/src/parser/event_parser/grammar.rs
@@ -6,7 +6,7 @@ use syntax_kinds::*;
 
 pub fn file(p: &mut Parser) {
     node(p, FILE, |p| {
-        shebang(p);
+        p.optional(SHEBANG);
         inner_attributes(p);
         many(p, |p| {
             skip_to_first(
@@ -17,11 +17,6 @@ pub fn file(p: &mut Parser) {
     })
 }
 
-
-fn shebang(_: &mut Parser) {
-    //TODO
-}
-
 fn inner_attributes(_: &mut Parser) {
     //TODO
 }
@@ -136,4 +131,10 @@ impl<'p> Parser<'p> {
             false
         }
     }
+
+    pub(crate) fn optional(&mut self, kind: SyntaxKind) {
+        if self.current_is(kind) {
+            self.bump();
+        }
+    }
 }
\ No newline at end of file
diff --git a/tests/data/parser/err/0002_duplicate_shebang.rs b/tests/data/parser/err/0002_duplicate_shebang.rs
new file mode 100644
index 0000000000..48a3a3980b
--- /dev/null
+++ b/tests/data/parser/err/0002_duplicate_shebang.rs
@@ -0,0 +1,2 @@
+#!/use/bin/env rusti
+#!/use/bin/env rusti
diff --git a/tests/data/parser/err/0002_duplicate_shebang.txt b/tests/data/parser/err/0002_duplicate_shebang.txt
new file mode 100644
index 0000000000..e7cf7187d0
--- /dev/null
+++ b/tests/data/parser/err/0002_duplicate_shebang.txt
@@ -0,0 +1,7 @@
+FILE@[0; 42)
+  SHEBANG@[0; 20)
+  ERROR@[20; 42)
+  err: `expected item`
+    WHITESPACE@[20; 21)
+    SHEBANG@[21; 41)
+    WHITESPACE@[41; 42)
diff --git a/tests/data/parser/ok/0004_file_shebang.rs b/tests/data/parser/ok/0004_file_shebang.rs
new file mode 100644
index 0000000000..53dc9e6173
--- /dev/null
+++ b/tests/data/parser/ok/0004_file_shebang.rs
@@ -0,0 +1 @@
+#!/use/bin/env rusti
\ No newline at end of file
diff --git a/tests/data/parser/ok/0004_file_shebang.txt b/tests/data/parser/ok/0004_file_shebang.txt
new file mode 100644
index 0000000000..33055cf3d2
--- /dev/null
+++ b/tests/data/parser/ok/0004_file_shebang.txt
@@ -0,0 +1,2 @@
+FILE@[0; 20)
+  SHEBANG@[0; 20)
diff --git a/tests/lexer.rs b/tests/lexer.rs
index 6c7531596e..20840f4560 100644
--- a/tests/lexer.rs
+++ b/tests/lexer.rs
@@ -2,30 +2,20 @@ extern crate file;
 extern crate libsyntax2;
 extern crate testutils;
 
-use std::path::{Path};
 use std::fmt::Write;
 
 use libsyntax2::{Token, tokenize};
-use testutils::{assert_equal_text, collect_tests};
+use testutils::dir_tests;
 
 #[test]
 fn lexer_tests() {
-    for test_case in collect_tests(&["lexer"]) {
-        lexer_test_case(&test_case);
-    }
-}
-
-fn lexer_test_case(path: &Path) {
-    let actual = {
-        let text = file::get_text(path).unwrap();
-        let tokens = tokenize(&text);
-        dump_tokens(&tokens, &text)
-    };
-    let path = path.with_extension("txt");
-    let expected = file::get_text(&path).unwrap();
-    let expected = expected.as_str();
-    let actual = actual.as_str();
-    assert_equal_text(expected, actual, &path)
+    dir_tests(
+        &["lexer"],
+        |text| {
+            let tokens = tokenize(text);
+            dump_tokens(&tokens, text)
+        }
+    )
 }
 
 fn dump_tokens(tokens: &[Token], text: &str) -> String {
diff --git a/tests/parser.rs b/tests/parser.rs
index 518852bb2f..02cef938d3 100644
--- a/tests/parser.rs
+++ b/tests/parser.rs
@@ -2,33 +2,21 @@ extern crate file;
 extern crate libsyntax2;
 extern crate testutils;
 
-use std::path::{Path};
 use std::fmt::Write;
 
 use libsyntax2::{tokenize, parse, Node, File};
-use testutils::{collect_tests, assert_equal_text};
+use testutils::dir_tests;
 
 #[test]
 fn parser_tests() {
-    for test_case in collect_tests(&["parser/ok", "parser/err"]) {
-        parser_test_case(&test_case);
-    }
-}
-
-fn parser_test_case(path: &Path) {
-    let actual = {
-        let text = file::get_text(path).unwrap();
-        let tokens = tokenize(&text);
-        let file = parse(text, &tokens);
-        dump_tree(&file)
-    };
-    let expected_path = path.with_extension("txt");
-    let expected = file::get_text(&expected_path).expect(
-        &format!("Can't read {}", expected_path.display())
-    );
-    let expected = expected.as_str();
-    let actual = actual.as_str();
-    assert_equal_text(expected, actual, &expected_path);
+    dir_tests(
+        &["parser/ok", "parser/err"],
+        |text| {
+            let tokens = tokenize(text);
+            let file = parse(text.to_string(), &tokens);
+            dump_tree(&file)
+        }
+    )
 }
 
 fn dump_tree(file: &File) -> String {
diff --git a/tests/testutils/src/lib.rs b/tests/testutils/src/lib.rs
index 9fc85cc24c..b34517c5f7 100644
--- a/tests/testutils/src/lib.rs
+++ b/tests/testutils/src/lib.rs
@@ -6,7 +6,33 @@ use std::fs::read_dir;
 
 use difference::Changeset;
 
-pub fn assert_equal_text(
+pub fn dir_tests<F>(
+    paths: &[&str],
+    f: F
+)
+where
+    F: Fn(&str) -> String
+{
+    for path in collect_tests(paths) {
+        let actual = {
+            let text = file::get_text(&path).unwrap();
+            f(&text)
+        };
+        let path = path.with_extension("txt");
+        if !path.exists() {
+            println!("\nfile: {}", path.display());
+            println!("No .txt file with expected result, creating...");
+            file::put_text(&path, actual).unwrap();
+            panic!("No expected result")
+        }
+        let expected = file::get_text(&path).unwrap();
+        let expected = expected.as_str();
+        let actual = actual.as_str();
+        assert_equal_text(expected, actual, &path);
+    }
+}
+
+fn assert_equal_text(
     expected: &str,
     actual: &str,
     path: &Path
@@ -16,7 +42,7 @@ pub fn assert_equal_text(
     }
 }
 
-pub fn collect_tests(paths: &[&str]) -> Vec<PathBuf> {
+fn collect_tests(paths: &[&str]) -> Vec<PathBuf> {
     paths.iter().flat_map(|path|  {
         let path = test_data_dir().join(path);
         test_from_dir(&path).into_iter()