diff --git a/.editorconfig b/.editorconfig
index 71c40829..b0e4dabd 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -19,3 +19,7 @@ indent_size = 3
 
 [tests/syntax_error/indentation_not4.jou]
 indent_size = 2
+
+[tests/should_succeed/newline_and_space_at_eof.jou]
+trim_trailing_whitespace = false
+indent_size = unset
diff --git a/self_hosted/tokenizer.jou b/self_hosted/tokenizer.jou
index 7edc1fa3..001bc310 100644
--- a/self_hosted/tokenizer.jou
+++ b/self_hosted/tokenizer.jou
@@ -276,6 +276,7 @@ class Tokenizer:
         if c == '\\':
             after_backslash = self->read_byte()
             if after_backslash == '\0' or after_backslash == '\n':
+                self->location.lineno--
                 fail(self->location, "missing ' to end the byte literal")
             elif after_backslash == 'n':
                 c = '\n'
diff --git a/src/tokenize.c b/src/tokenize.c
index c7d6cbed..c744617c 100644
--- a/src/tokenize.c
+++ b/src/tokenize.c
@@ -126,7 +126,6 @@ static int read_indentation_level_for_newline_token(struct State *st)
             consume_rest_of_line(st);
         else if (c == '\0') {
             // Ignore newline+spaces at end of file. Do not validate 4 spaces.
-            // TODO: test case
             return 0;
         } else {
             unread_byte(st, c);
@@ -295,7 +294,6 @@ static char *read_string(struct State *st, char quote, int *len)
             case '\n':
                 // \ at end of line, string continues on next line
                 if (quote == '\'') {
-                    // TODO: tests
                     st->location.lineno--;  // to get error at the correct line number
                     goto missing_end_quote;
                 }
@@ -321,7 +319,6 @@ static char *read_string(struct State *st, char quote, int *len)
     return result.ptr;
 
 missing_end_quote:
-    // TODO: tests
     if (quote == '"')
         fail_with_error(st->location, "missing \" to end the string");
     else
diff --git a/src/typecheck.c b/src/typecheck.c
index 2f3069c7..a7d034e3 100644
--- a/src/typecheck.c
+++ b/src/typecheck.c
@@ -87,7 +87,6 @@ static const char *short_type_description(const Type *t)
         case TYPE_ARRAY:
             return "an array type";
         case TYPE_BOOL:
-            // TODO: Is it possible to get this in an error message?
             return "the built-in bool type";
     }
 }
diff --git a/tests/already_exists_error/bool.jou b/tests/already_exists_error/bool.jou
new file mode 100644
index 00000000..38f92a5d
--- /dev/null
+++ b/tests/already_exists_error/bool.jou
@@ -0,0 +1,2 @@
+def foo() -> None:
+    x = True.asdf() # Error: type bool does not have any methods because it is the built-in bool type, not a class
diff --git a/tests/should_succeed/newline_and_space_at_eof.jou b/tests/should_succeed/newline_and_space_at_eof.jou
new file mode 100644
index 00000000..5a847337
--- /dev/null
+++ b/tests/should_succeed/newline_and_space_at_eof.jou
@@ -0,0 +1,3 @@
+def main() -> int:
+    return 0
+  
\ No newline at end of file
diff --git a/tests/syntax_error/missing_end_quote_in_byte.jou b/tests/syntax_error/missing_end_quote_in_byte.jou
new file mode 100644
index 00000000..3483fa58
--- /dev/null
+++ b/tests/syntax_error/missing_end_quote_in_byte.jou
@@ -0,0 +1,6 @@
+import "stdlib/io.jou"
+
+# Output: compiler error in file "tests/syntax_error/missing_end_quote_in_byte.jou", line 5: missing ' to end the byte literal
+def main() -> int:
+    printf('?)
+    return 0
diff --git a/tests/syntax_error/missing_end_quote_in_string.jou b/tests/syntax_error/missing_end_quote_in_string.jou
new file mode 100644
index 00000000..991f6b74
--- /dev/null
+++ b/tests/syntax_error/missing_end_quote_in_string.jou
@@ -0,0 +1,6 @@
+import "stdlib/io.jou"
+
+# Output: compiler error in file "tests/syntax_error/missing_end_quote_in_string.jou", line 5: missing " to end the string
+def main() -> int:
+    printf("Hello)
+    return 0
diff --git a/tests/syntax_error/string_continue_on_next_line.jou b/tests/syntax_error/string_continue_on_next_line.jou
new file mode 100644
index 00000000..925e19d4
--- /dev/null
+++ b/tests/syntax_error/string_continue_on_next_line.jou
@@ -0,0 +1,8 @@
+import "stdlib/io.jou"
+
+# Output: compiler error in file "tests/syntax_error/string_continue_on_next_line.jou", line 6: missing " to end the string
+def main() -> int:
+    a = "\
+    asdf
+    printf(a)
+    return 0