add test for non_snake_case case

Author: jonboh

tests/ui/struct_fields.rs

@@ -45,6 +45,21 @@ struct DoublePostfix {
     c_some_data: bool,
 }
 
+#[allow(non_snake_case)]
+struct NotSnakeCase {
+    //~^ ERROR: all fields have the same postfix: `someData`
+    a_someData: bool,
+    b_someData: bool,
+    c_someData: bool,
+}
+#[allow(non_snake_case)]
+struct NotSnakeCase2 {
+    //~^ ERROR: all fields have the same prefix: `someData`
+    someData_c: bool,
+    someData_b: bool,
+    someData_a_b: bool,
+}
+
 // no error, threshold is 3 fiels by default
 struct Fooo {
     foo: u8,

tests/ui/struct_fields.stderr

@@ -65,8 +65,34 @@ LL | | }
    |
    = help: remove the postfixes
 
+error: all fields have the same postfix: `someData`
+  --> $DIR/struct_fields.rs:49:1
+   |
+LL | / struct NotSnakeCase {
+LL | |
+LL | |     a_someData: bool,
+LL | |     b_someData: bool,
+LL | |     c_someData: bool,
+LL | | }
+   | |_^
+   |
+   = help: remove the postfixes
+
+error: all fields have the same prefix: `someData`
+  --> $DIR/struct_fields.rs:56:1
+   |
+LL | / struct NotSnakeCase2 {
+LL | |
+LL | |     someData_c: bool,
+LL | |     someData_b: bool,
+LL | |     someData_a_b: bool,
+LL | | }
+   | |_^
+   |
+   = help: remove the prefixes
+
 error: all fields have the same prefix: `prefix`
-  --> $DIR/struct_fields.rs:54:1
+  --> $DIR/struct_fields.rs:69:1
    |
 LL | / struct NonCaps {
 LL | |
@@ -79,7 +105,7 @@ LL | | }
    = help: remove the prefixes
 
 error: all fields have the same prefix: `_type`
-  --> $DIR/struct_fields.rs:104:5
+  --> $DIR/struct_fields.rs:119:5
    |
 LL | /     struct DoLint {
 LL | |
@@ -93,7 +119,7 @@ LL | |     }
    = help: remove the prefixes
 
 error: all fields have the same postfix: `type`
-  --> $DIR/struct_fields.rs:112:5
+  --> $DIR/struct_fields.rs:127:5
    |
 LL | /     struct DoLintToo {
 LL | |
@@ -105,5 +131,5 @@ LL | |     }
    |
    = help: remove the postfixes
 
-error: aborting due to 9 previous errors
+error: aborting due to 11 previous errors