refactor: redundant_test_prefix configuration tests

Author: farazdagi

clippy_lints/src/redundant_test_prefix.rs

@@ -4,7 +4,7 @@ use clippy_utils::{is_in_cfg_test, is_in_test_function};
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{Body, FnDecl};
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_session::{ impl_lint_pass};
+use rustc_session::impl_lint_pass;
 use rustc_span::Span;
 use rustc_span::def_id::LocalDefId;
 

tests/ui-toml/redundant_test_prefix/default/clippy.toml

@@ -0,0 +1 @@
+redundant-test-prefix-in-integration-tests = false

tests/ui-toml/redundant_test_prefix/in_integration_tests/clippy.toml

@@ -0,0 +1 @@
+redundant-test-prefix-in-integration-tests = true

tests/ui-toml/redundant_test_prefix/redundant_test_prefix.integ_tests.stderr

@@ -0,0 +1,24 @@
+error: redundant `test_` prefix in test function name
+  --> tests/ui-toml/redundant_test_prefix/redundant_test_prefix.rs:14:5
+   |
+LL | /     fn test_has_annotation() {
+LL | |
+LL | |     }
+   | |_____^
+   |
+   = help: consider removing the `test_` prefix
+   = note: `-D clippy::redundant-test-prefix` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::redundant_test_prefix)]`
+
+error: redundant `test_` prefix in test function name
+  --> tests/ui-toml/redundant_test_prefix/redundant_test_prefix.rs:22:1
+   |
+LL | / fn test_main_module_has_annotation() {
+LL | |
+LL | | }
+   | |_^
+   |
+   = help: consider removing the `test_` prefix
+
+error: aborting due to 2 previous errors
+

tests/ui-toml/redundant_test_prefix/redundant_test_prefix.rs

@@ -0,0 +1,29 @@
+//@revisions: default integ_tests
+//@[default] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/redundant_test_prefix/default
+//@[integ_tests] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/redundant_test_prefix/in_integration_tests
+//@compile-flags: --test
+#![allow(dead_code)]
+#![warn(clippy::redundant_test_prefix)]
+
+fn main() {}
+
+mod tests_no_annotations {
+    use super::*;
+
+    #[test]
+    fn test_has_annotation() {
+        //~[integ_tests]^ redundant_test_prefix
+    }
+
+    fn no_annotation() {}
+}
+
+#[test]
+fn test_main_module_has_annotation() {
+    //~[integ_tests]^ redundant_test_prefix
+}
+
+fn test_main_module_no_annotation() {}
+
+#[cfg(test)]
+mod tests {}