Added allow-expect-in-tests / allow-unwrap-in-tests (#2328)

This PR:
* Added the clippy.toml to configure allowable expect / unwrap usage in
tests
* Removed as many expect/allow lines as possible from tests
* moved a bunch of allows to expects where possible

Note: in integration tests, non `#[test]` helper functions are not
covered by this so we had to leave a few lingering `expect(expect_used`
checks around

codex-rs/execpolicy/tests/bad.rs

@@ -1,4 +1,3 @@
-#![expect(clippy::expect_used)]
 use codex_execpolicy::NegativeExamplePassedCheck;
 use codex_execpolicy::get_default_policy;
 

codex-rs/execpolicy/tests/cp.rs

@@ -1,4 +1,3 @@
-#![expect(clippy::expect_used)]
 extern crate codex_execpolicy;
 
 use codex_execpolicy::ArgMatcher;
@@ -12,6 +11,7 @@ use codex_execpolicy::Result;
 use codex_execpolicy::ValidExec;
 use codex_execpolicy::get_default_policy;
 
+#[expect(clippy::expect_used)]
 fn setup() -> Policy {
     get_default_policy().expect("failed to load default policy")
 }

codex-rs/execpolicy/tests/good.rs

@@ -1,4 +1,3 @@
-#![expect(clippy::expect_used)]
 use codex_execpolicy::PositiveExampleFailedCheck;
 use codex_execpolicy::get_default_policy;
 

codex-rs/execpolicy/tests/head.rs

@@ -1,4 +1,3 @@
-#![expect(clippy::expect_used)]
 use codex_execpolicy::ArgMatcher;
 use codex_execpolicy::ArgType;
 use codex_execpolicy::Error;
@@ -13,6 +12,7 @@ use codex_execpolicy::get_default_policy;
 
 extern crate codex_execpolicy;
 
+#[expect(clippy::expect_used)]
 fn setup() -> Policy {
     get_default_policy().expect("failed to load default policy")
 }

codex-rs/execpolicy/tests/literal.rs

@@ -1,4 +1,3 @@
-#![expect(clippy::expect_used)]
 use codex_execpolicy::ArgType;
 use codex_execpolicy::Error;
 use codex_execpolicy::ExecCall;

codex-rs/execpolicy/tests/ls.rs

@@ -1,4 +1,3 @@
-#![expect(clippy::expect_used)]
 extern crate codex_execpolicy;
 
 use codex_execpolicy::ArgType;
@@ -12,6 +11,7 @@ use codex_execpolicy::Result;
 use codex_execpolicy::ValidExec;
 use codex_execpolicy::get_default_policy;
 
+#[expect(clippy::expect_used)]
 fn setup() -> Policy {
     get_default_policy().expect("failed to load default policy")
 }

codex-rs/execpolicy/tests/pwd.rs

@@ -1,4 +1,3 @@
-#![expect(clippy::expect_used)]
 extern crate codex_execpolicy;
 
 use std::vec;
@@ -12,6 +11,7 @@ use codex_execpolicy::PositionalArg;
 use codex_execpolicy::ValidExec;
 use codex_execpolicy::get_default_policy;
 
+#[expect(clippy::expect_used)]
 fn setup() -> Policy {
     get_default_policy().expect("failed to load default policy")
 }

codex-rs/execpolicy/tests/sed.rs

@@ -1,4 +1,3 @@
-#![expect(clippy::expect_used)]
 extern crate codex_execpolicy;
 
 use codex_execpolicy::ArgType;
@@ -13,6 +12,7 @@ use codex_execpolicy::Result;
 use codex_execpolicy::ValidExec;
 use codex_execpolicy::get_default_policy;
 
+#[expect(clippy::expect_used)]
 fn setup() -> Policy {
     get_default_policy().expect("failed to load default policy")
 }