simplify tests

internal/test_helpers/fixtures/pass_scanning

@@ -615,16 +615,15 @@ Debug = true
 [stage-6] [test-1] ✓ Received exit code 0.
 [stage-6] [test-2] Running test case: 2
 [stage-6] [test-2] Writing contents to ./test.lox:
-[stage-6] [test-2] [test.lox] ===
+[stage-6] [test-2] [test.lox] ==
 [stage-6] [test-2] $ ./your_program.sh tokenize test.lox
 [your_program] EQUAL_EQUAL == null
-[your_program] EQUAL = null
 [your_program] EOF null
-[stage-6] [test-2] ✓ 3 line(s) match on stdout
+[stage-6] [test-2] ✓ 2 line(s) match on stdout
 [stage-6] [test-2] ✓ Received exit code 0.
 [stage-6] [test-3] Running test case: 3
 [stage-6] [test-3] Writing contents to ./test.lox:
-[stage-6] [test-3] [test.lox] ({=}){=====}
+[stage-6] [test-3] [test.lox] ({=}){==}
 [stage-6] [test-3] $ ./your_program.sh tokenize test.lox
 [your_program] LEFT_PAREN ( null
 [your_program] LEFT_BRACE { null
@@ -633,11 +632,9 @@ Debug = true
 [your_program] RIGHT_PAREN ) null
 [your_program] LEFT_BRACE { null
 [your_program] EQUAL_EQUAL == null
-[your_program] EQUAL_EQUAL == null
-[your_program] EQUAL = null
 [your_program] RIGHT_BRACE } null
 [your_program] EOF null
-[stage-6] [test-3] ✓ 11 line(s) match on stdout
+[stage-6] [test-3] ✓ 9 line(s) match on stdout
 [stage-6] [test-3] ✓ Received exit code 0.
 [stage-6] [test-4] Running test case: 4
 [stage-6] [test-4] Writing contents to ./test.lox: