Avoid test.cr in root of repo conflicting with parser warning specs

Co-authored-by: Quinton Miller <nicetas.c@gmail.com>

spec/compiler/parser/warnings_spec.cr

@@ -2,7 +2,7 @@ require "../../support/syntax"
 
 private def assert_parser_warning(source, message, *, file = __FILE__, line = __LINE__)
   parser = Parser.new(source)
-  parser.filename = "test.cr"
+  parser.filename = "/test.cr"
   parser.parse
 
   warnings = parser.warnings.infos
@@ -12,7 +12,7 @@ end
 
 private def assert_no_parser_warning(source, *, file = __FILE__, line = __LINE__)
   parser = Parser.new(source)
-  parser.filename = "test.cr"
+  parser.filename = "/test.cr"
   parser.parse
 
   warnings = parser.warnings.infos
@@ -39,28 +39,28 @@ describe "Parser warnings" do
 
   describe "warns on missing space before colon" do
     it "in block param type restriction" do
-      assert_parser_warning("def foo(&block: Foo)\nend", "warning in test.cr:1\nWarning: space required before colon in type restriction (run `crystal tool format` to fix this)")
+      assert_parser_warning("def foo(&block: Foo)\nend", "warning in /test.cr:1\nWarning: space required before colon in type restriction (run `crystal tool format` to fix this)")
       assert_no_parser_warning("def foo(&block : Foo)\nend")
       assert_no_parser_warning("def foo(&@foo)\nend")
     end
 
     it "in anonymous block param type restriction" do
-      assert_parser_warning("def foo(&: Foo)\nend", "warning in test.cr:1\nWarning: space required before colon in type restriction (run `crystal tool format` to fix this)")
+      assert_parser_warning("def foo(&: Foo)\nend", "warning in /test.cr:1\nWarning: space required before colon in type restriction (run `crystal tool format` to fix this)")
       assert_no_parser_warning("def foo(& : Foo)\nend")
       assert_no_parser_warning("def foo(&)\nend")
     end
 
     it "in type declaration" do
-      assert_parser_warning("x: Int32", "warning in test.cr:1\nWarning: space required before colon in type declaration (run `crystal tool format` to fix this)")
+      assert_parser_warning("x: Int32", "warning in /test.cr:1\nWarning: space required before colon in type declaration (run `crystal tool format` to fix this)")
       assert_no_parser_warning("x : Int32")
-      assert_parser_warning("class Foo\n@x: Int32\nend", "warning in test.cr:2\nWarning: space required before colon in type declaration (run `crystal tool format` to fix this)")
+      assert_parser_warning("class Foo\n@x: Int32\nend", "warning in /test.cr:2\nWarning: space required before colon in type declaration (run `crystal tool format` to fix this)")
       assert_no_parser_warning("class Foo\n@x : Int32\nend")
-      assert_parser_warning("class Foo\n@@x: Int32\nend", "warning in test.cr:2\nWarning: space required before colon in type declaration (run `crystal tool format` to fix this)")
+      assert_parser_warning("class Foo\n@@x: Int32\nend", "warning in /test.cr:2\nWarning: space required before colon in type declaration (run `crystal tool format` to fix this)")
       assert_no_parser_warning("class Foo\n@@x : Int32\nend")
     end
 
     it "in return type restriction" do
-      assert_parser_warning("def foo: Foo\nend", "warning in test.cr:1\nWarning: space required before colon in return type restriction (run `crystal tool format` to fix this)")
+      assert_parser_warning("def foo: Foo\nend", "warning in /test.cr:1\nWarning: space required before colon in return type restriction (run `crystal tool format` to fix this)")
       assert_no_parser_warning("def foo : Foo\nend")
     end
   end