michael@0: def WebIDLTest(parser, harness):
michael@0:     threw = False
michael@0:     try:
michael@0:         parser.parse("""
michael@0:             interface Promise {};
michael@0:             interface A {
michael@0:               legacycaller Promise foo();
michael@0:             };
michael@0:         """)
michael@0:         results = parser.finish()
michael@0: 
michael@0:     except:
michael@0:         threw = True
michael@0:     harness.ok(threw,
michael@0:                "Should not allow Promise return values for legacycaller.")
michael@0: 
michael@0:     parser = parser.reset()
michael@0:     threw = False
michael@0:     try:
michael@0:         parser.parse("""
michael@0:             interface Promise {};
michael@0:             interface A {
michael@0:               Promise foo();
michael@0:               long foo(long arg);
michael@0:             };
michael@0:         """)
michael@0:         results = parser.finish();
michael@0:     except:
michael@0:         threw = True
michael@0:     harness.ok(threw,
michael@0:                "Should not allow overloads which have both Promise and "
michael@0:                "non-Promise return types.")
michael@0: 
michael@0:     parser = parser.reset()
michael@0:     threw = False
michael@0:     try:
michael@0:         parser.parse("""
michael@0:             interface Promise {};
michael@0:             interface A {
michael@0:               long foo(long arg);
michael@0:               Promise foo();
michael@0:             };
michael@0:         """)
michael@0:         results = parser.finish();
michael@0:     except:
michael@0:         threw = True
michael@0:     harness.ok(threw,
michael@0:                "Should not allow overloads which have both Promise and "
michael@0:                "non-Promise return types.")
michael@0: 
michael@0:     parser = parser.reset()
michael@0:     parser.parse("""
michael@0:         interface Promise {};
michael@0:         interface A {
michael@0:           Promise foo();
michael@0:           Promise foo(long arg);
michael@0:         };
michael@0:     """)
michael@0:     results = parser.finish();
michael@0: 
michael@0:     harness.ok(True,
michael@0:                "Should allow overloads which only have Promise and return "
michael@0:                "types.")