2 files changed, 31 insertions, 2 deletions
diff --git a/test/unit/input/empty_lld.wat b/test/unit/input/empty_lld.wat
new file mode 100644
index 000000000..978caab81
--- /dev/null
+++ b/test/unit/input/empty_lld.wat
@@ -0,0 +1,9 @@
+(module
+ (global $global$0 (mut i32) (i32.const 66192))
+ (global $global$1 i32 (i32.const 652))
+ (export "__data_end" (global $global$1))
+ (export "main" (func $main))
+ (func $main (param $0 i32) (param $1 i32) (result i32)
+  (i32.const 0)
+ )
+)
diff --git a/test/unit/test_finalize.py b/test/unit/test_finalize.py
index ff4eebd9c..b393177bd 100644
--- a/test/unit/test_finalize.py
+++ b/test/unit/test_finalize.py
@@ -6,10 +6,30 @@ from . import utils
 
 class EmscriptenFinalizeTest(utils.BinaryenTestCase):
     def test_em_asm_mangled_string(self):
-        input_dir = os.path.dirname(__file__)
         p = shared.run_process(shared.WASM_EMSCRIPTEN_FINALIZE + [
-            os.path.join(input_dir, 'input', 'em_asm_mangled_string.wat'), '-o', os.devnull, '--global-base=1024'
+            self.input_path('em_asm_mangled_string.wat'), '-o', os.devnull, '--global-base=1024'
         ], check=False, capture_output=True)
         self.assertNotEqual(p.returncode, 0)
         self.assertIn('Fatal: local.get of unknown in arg0 of call to emscripten_asm_const_int (used by EM_ASM* macros) in function main.', p.stderr)
         self.assertIn('This might be caused by aggressive compiler transformations. Consider using EM_JS instead.', p.stderr)
+
+    def do_output_test(self, args):
+        # without any output file specified, don't error, don't write the wasm,
+        # but do emit metadata
+        p = shared.run_process(shared.WASM_EMSCRIPTEN_FINALIZE + [
+            self.input_path('empty_lld.wat'), '--global-base=1024'
+        ] + args, capture_output=True)
+        # metadata is always present
+        self.assertIn('{', p.stdout)
+        self.assertIn('}', p.stdout)
+        return p.stdout
+
+    def test_no_output(self):
+        stdout = self.do_output_test([])
+        # module is not present
+        self.assertNotIn('(module', stdout)
+
+    def test_text_output(self):
+        stdout = self.do_output_test(['-S'])
+        # module is present
+        self.assertIn('(module', stdout)