Remove rust test dependency on cmake output

The test_history_formats test was reading from build/tests/ which is an artifact
of the cmake test runner. The source code tests should not depend on the cmake
test harness at all, so this is changed to read from the original test source in
the ./tests/ directory instead.

src/tests/history.rs

@@ -1,13 +1,11 @@
-use crate::common::{is_windows_subsystem_for_linux, str2wcstring, wcs2osstring};
+use crate::common::{is_windows_subsystem_for_linux, str2wcstring, wcs2osstring, wcs2string};
 use crate::env::{EnvMode, EnvStack};
-use crate::fds::wopen_cloexec;
 use crate::history::{self, History, HistoryItem, HistorySearch, PathList, SearchDirection};
 use crate::path::path_get_data;
 use crate::tests::prelude::*;
 use crate::tests::string_escape::ESCAPE_TEST_CHAR;
 use crate::wchar::prelude::*;
 use crate::wcstringutil::{string_prefixes_string, string_prefixes_string_case_insensitive};
-use nix::{fcntl::OFlag, sys::stat::Mode};
 use rand::random;
 use std::collections::VecDeque;
 use std::ffi::CString;
@@ -560,7 +558,9 @@ fn test_history_path_detection() {
 fn install_sample_history(name: &wstr) {
     let path = path_get_data().expect("Failed to get data directory");
     std::fs::copy(
-        wcs2osstring(&(L!("tests/").to_owned() + &name[..])),
+        env!("CARGO_MANIFEST_DIR").to_owned()
+            + "/tests/"
+            + std::str::from_utf8(&wcs2string(&name[..])).unwrap(),
         wcs2osstring(&(path + L!("/") + &name[..] + L!("_history"))),
     )
     .unwrap();
@@ -598,12 +598,9 @@ fn test_history_formats() {
         "echo foo".into(),
     ];
     let test_history_imported_from_bash = History::with_name(L!("bash_import"));
-    let file = wopen_cloexec(
-        L!("tests/history_sample_bash"),
-        OFlag::O_RDONLY,
-        Mode::empty(),
-    )
-    .unwrap();
+    let file =
+        std::fs::File::open(env!("CARGO_MANIFEST_DIR").to_owned() + "/tests/history_sample_bash")
+            .unwrap();
     test_history_imported_from_bash.populate_from_bash(BufReader::new(file));
     assert_eq!(test_history_imported_from_bash.get_history(), expected);
     test_history_imported_from_bash.clear();