[ruby/prism] Simplify locals test now that all fixtures are valid

https://github.com/ruby/prism/commit/0d32af5719

test/prism/fixtures/if.txt

@@ -30,10 +30,10 @@ if type in 1
 elsif type in B
 end
 
-if 1
+if f1
   lambda do |_|
   end
-elsif 2
+elsif f2
   lambda do |_|
   end
 else

test/prism/locals_test.rb

@@ -17,51 +17,11 @@ require_relative "test_helper"
 
 module Prism
   class LocalsTest < TestCase
-    invalid = []
-    todos = []
-
-    # Invalid break
-    invalid << "break.txt"
-    invalid << "if.txt"
-    invalid << "rescue.txt"
-    invalid << "seattlerb/block_break.txt"
-    invalid << "unless.txt"
-    invalid << "whitequark/break.txt"
-    invalid << "whitequark/break_block.txt"
-
-    # Invalid next
-    invalid << "next.txt"
-    invalid << "seattlerb/block_next.txt"
-    invalid << "unparser/corpus/literal/control.txt"
-    invalid << "whitequark/next.txt"
-    invalid << "whitequark/next_block.txt"
-
-    # Invalid redo
-    invalid << "keywords.txt"
-    invalid << "whitequark/redo.txt"
-
-    # Invalid retry
-    invalid << "whitequark/retry.txt"
-
-    # Invalid yield
-    invalid << "seattlerb/dasgn_icky2.txt"
-    invalid << "seattlerb/yield_arg.txt"
-    invalid << "seattlerb/yield_call_assocs.txt"
-    invalid << "seattlerb/yield_empty_parens.txt"
-    invalid << "unparser/corpus/literal/yield.txt"
-    invalid << "whitequark/args_assocs.txt"
-    invalid << "whitequark/args_assocs_legacy.txt"
-    invalid << "whitequark/yield.txt"
-    invalid << "yield.txt"
-
-    # Dead code eliminated
-    invalid << "whitequark/ruby_bug_10653.txt"
-
     base = File.join(__dir__, "fixtures")
-    skips = invalid | todos
-
     Dir["**/*.txt", base: base].each do |relative|
-      next if skips.include?(relative)
+      # Skip this fixture because it has a different number of locals because
+      # CRuby is eliminating dead code.
+      next if relative == "whitequark/ruby_bug_10653.txt"
 
       filepath = File.join(base, relative)
       define_method("test_#{relative}") { assert_locals(filepath) }

test/prism/snapshots/if.txt

@@ -391,9 +391,16 @@
         └── @ IfNode (location: (33,0)-(42,3))
             ├── if_keyword_loc: (33,0)-(33,2) = "if"
             ├── predicate:
-            │   @ IntegerNode (location: (33,3)-(33,4))
-            │   ├── flags: decimal
-            │   └── value: 1
+            │   @ CallNode (location: (33,3)-(33,5))
+            │   ├── flags: variable_call, ignore_visibility
+            │   ├── receiver: ∅
+            │   ├── call_operator_loc: ∅
+            │   ├── name: :f1
+            │   ├── message_loc: (33,3)-(33,5) = "f1"
+            │   ├── opening_loc: ∅
+            │   ├── arguments: ∅
+            │   ├── closing_loc: ∅
+            │   └── block: ∅
             ├── then_keyword_loc: ∅
             ├── statements:
             │   @ StatementsNode (location: (34,2)-(35,5))
@@ -434,9 +441,16 @@
             │   @ IfNode (location: (36,0)-(42,3))
             │   ├── if_keyword_loc: (36,0)-(36,5) = "elsif"
             │   ├── predicate:
-            │   │   @ IntegerNode (location: (36,6)-(36,7))
-            │   │   ├── flags: decimal
-            │   │   └── value: 2
+            │   │   @ CallNode (location: (36,6)-(36,8))
+            │   │   ├── flags: variable_call, ignore_visibility
+            │   │   ├── receiver: ∅
+            │   │   ├── call_operator_loc: ∅
+            │   │   ├── name: :f2
+            │   │   ├── message_loc: (36,6)-(36,8) = "f2"
+            │   │   ├── opening_loc: ∅
+            │   │   ├── arguments: ∅
+            │   │   ├── closing_loc: ∅
+            │   │   └── block: ∅
             │   ├── then_keyword_loc: ∅
             │   ├── statements:
             │   │   @ StatementsNode (location: (37,2)-(38,5))