feat: add test for getDescription

src/extra/fish.zig

@@ -192,3 +192,15 @@ fn getDescription(comptime help: []const u8) []const u8 {
 
     return out[0..len];
 }
+
+test "getDescription" {
+    const input = "First sentence with \"quotes\"\nand newlines. Second sentence.";
+    const expected = "First sentence with \\\"quotes\\\" and newlines.";
+    const result = comptime getDescription(input);
+
+    comptime {
+        if (!std.mem.eql(u8, result, expected)) {
+            @compileError("getDescription test failed: expected '" ++ expected ++ "' but got '" ++ result ++ "'");
+        }
+    }
+}