treewide: enforce strict clippy check

fix/tests/tests/derivation.rs

@@ -402,17 +402,15 @@ fn fixed_output_sha256_flat() {
 
 #[test_log::test]
 fn fixed_output_missing_hashalgo() {
-    assert!(
-        eval_deep_result(
-            r#"derivation {
+    eval_deep_result(
+        r#"derivation {
             name = "default";
             builder = "/bin/sh";
             system = "x86_64-linux";
             outputHash = "0000000000000000000000000000000000000000000000000000000000000000";
         }"#,
-        )
-        .is_err()
-    );
+    )
+    .unwrap_err();
 }
 
 #[test_log::test]

fix/tests/tests/io_operations.rs

@@ -350,7 +350,7 @@ fn read_dir_nonexistent_fails() {
     let expr = r#"builtins.readDir "/nonexistent/directory""#;
     let result = eval_result(expr);
 
-    assert!(result.is_err());
+    result.unwrap_err();
 }
 
 #[test_log::test]

fix/tests/tests/lang.rs

@@ -5,6 +5,7 @@ use std::path::PathBuf;
 use fix::Evaluator;
 use fix_error::{Source, SourceType};
 use fix_lang::Value;
+use serial_test::serial;
 
 fn get_lang_dir() -> PathBuf {
     PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests/tests/lang")
@@ -160,9 +161,14 @@ mod okay {
     eval_okay_test!(getattrpos);
     eval_okay_test!(getattrpos_functionargs);
     eval_okay_test!(getattrpos_undefined);
-    eval_okay_test!(getenv, || {
-        unsafe { std::env::set_var("TEST_VAR", "foo") };
-    });
+    eval_okay_test!(
+        #[serial(env)]
+        getenv,
+        || {
+            // SAFETY: guarded with #[serial_test::serial]
+            unsafe { std::env::set_var("TEST_VAR", "foo") };
+        }
+    );
     eval_okay_test!(groupBy);
     eval_okay_test!(r#if);
     eval_okay_test!(ind_string);
@@ -194,11 +200,16 @@ mod okay {
     eval_okay_test!(partition);
     eval_okay_test!(path);
     eval_okay_test!(pathexists);
-    eval_okay_test!(path_string_interpolation, || {
-        unsafe {
-            std::env::set_var("HOME", "/fake-home");
+    eval_okay_test!(
+        #[serial(env)]
+        path_string_interpolation,
+        || {
+            // SAFETY: guarded with #[serial_test::serial]
+            unsafe {
+                std::env::set_var("HOME", "/fake-home");
+            }
         }
-    });
+    );
     eval_okay_test!(patterns);
     eval_okay_test!(print);
     eval_okay_test!(readDir);

fix/tests/tests/main.rs

@@ -1,3 +1,11 @@
+#![allow(clippy::allow_attributes_without_reason)]
+#![allow(
+    dead_code,
+    clippy::unwrap_used,
+    clippy::unwrap_in_result,
+    clippy::panic
+)]
+
 mod derivation;
 mod findfile;
 mod io_operations;

fix/tests/tests/string_context.rs

@@ -348,7 +348,7 @@ fn substring_zero_length_empty_value() {
 }
 
 #[test_log::test]
-#[allow(non_snake_case)]
+#[expect(non_snake_case)]
 fn concatStringsSep_preserves_context() {
     let result = eval(
         r#"
@@ -365,7 +365,7 @@ fn concatStringsSep_preserves_context() {
 }
 
 #[test_log::test]
-#[allow(non_snake_case)]
+#[expect(non_snake_case)]
 fn concatStringsSep_merges_contexts() {
     let result = eval(
         r#"
@@ -383,7 +383,7 @@ fn concatStringsSep_merges_contexts() {
 }
 
 #[test_log::test]
-#[allow(non_snake_case)]
+#[expect(non_snake_case)]
 fn concatStringsSep_separator_has_context() {
     let result = eval(
         r#"
@@ -398,7 +398,7 @@ fn concatStringsSep_separator_has_context() {
 }
 
 #[test_log::test]
-#[allow(non_snake_case)]
+#[expect(non_snake_case)]
 fn replaceStrings_input_context_preserved() {
     let result = eval(
         r#"
@@ -413,7 +413,7 @@ fn replaceStrings_input_context_preserved() {
 }
 
 #[test_log::test]
-#[allow(non_snake_case)]
+#[expect(non_snake_case)]
 fn replaceStrings_replacement_context_collected() {
     let result = eval(
         r#"
@@ -428,7 +428,7 @@ fn replaceStrings_replacement_context_collected() {
 }
 
 #[test_log::test]
-#[allow(non_snake_case)]
+#[expect(non_snake_case)]
 fn replaceStrings_merges_contexts() {
     let result = eval(
         r#"
@@ -446,7 +446,7 @@ fn replaceStrings_merges_contexts() {
 }
 
 #[test_log::test]
-#[allow(non_snake_case)]
+#[expect(non_snake_case)]
 fn replaceStrings_lazy_evaluation_context() {
     let result = eval(
         r#"
@@ -461,7 +461,7 @@ fn replaceStrings_lazy_evaluation_context() {
 }
 
 #[test_log::test]
-#[allow(non_snake_case)]
+#[expect(non_snake_case)]
 fn baseNameOf_preserves_context() {
     let result = eval(
         r#"

fix/tests/tests/utils.rs

@@ -1,5 +1,3 @@
-#![allow(dead_code)]
-
 use fix::Evaluator;
 use fix_error::{Result, Source};
 use fix_lang::Value;