windows: Fix tests on Windows (#22616)

Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla.c.maki@gmail.com>

crates/editor/src/test.rs

@@ -1,12 +1,15 @@
 pub mod editor_lsp_test_context;
 pub mod editor_test_context;
 
+use std::sync::LazyLock;
+
 use crate::{
     display_map::{DisplayMap, DisplaySnapshot, ToDisplayPoint},
     DisplayPoint, Editor, EditorMode, FoldPlaceholder, MultiBuffer,
 };
 use gpui::{
-    AppContext as _, Context, Entity, Font, FontFeatures, FontStyle, FontWeight, Pixels, Window,
+    font, AppContext as _, Context, Entity, Font, FontFeatures, FontStyle, FontWeight, Pixels,
+    Window,
 };
 use project::Project;
 use util::test::{marked_text_offsets, marked_text_ranges};
@@ -19,6 +22,22 @@ fn init_logger() {
     }
 }
 
+pub fn test_font() -> Font {
+    static TEST_FONT: LazyLock<Font> = LazyLock::new(|| {
+        #[cfg(not(target_os = "windows"))]
+        {
+            font("Helvetica")
+        }
+
+        #[cfg(target_os = "windows")]
+        {
+            font("Courier New")
+        }
+    });
+
+    TEST_FONT.clone()
+}
+
 // Returns a snapshot from text containing '|' character markers with the markers removed, and DisplayPoints for each one.
 pub fn marked_display_snapshot(
     text: &str,