fix missing preamble when shebang is absent (#1742)

1 files changed, 9 insertions, 1 deletions

diff --git a/test/mocha/comment-filter.js b/test/mocha/comment-filter.js
index 9474e732..ec17aa8c 100644
--- a/test/mocha/comment-filter.js
+++ b/test/mocha/comment-filter.js
@@ -79,5 +79,13 @@ describe("comment filters", function() {
             output: { preamble: "/* Build */" }
         }).code;
         assert.strictEqual(code, "#!/usr/bin/node\n/* Build */\nvar x=10;");
-    })
+    });
+
+    it("Should handle preamble without shebang correctly", function() {
+        var code = UglifyJS.minify("var x = 10;", {
+            fromString: true,
+            output: { preamble: "/* Build */" }
+        }).code;
+        assert.strictEqual(code, "/* Build */\nvar x=10;");
+    });
 });