formula: fix boolean result output

src/worksheet.rs

@@ -17677,7 +17677,14 @@ impl Worksheet {
         };
 
         let formula = crate::xmlwriter::escape_xml_data(formula);
-        let result = crate::xmlwriter::escape_xml_data(result);
+        let mut result = crate::xmlwriter::escape_xml_data(result);
+
+        if result == "TRUE" {
+            result = Cow::Owned("1".to_string());
+        }
+        if result == "FALSE" {
+            result = Cow::Owned("0".to_string());
+        }
 
         write!(
             writer,
@@ -17725,7 +17732,14 @@ impl Worksheet {
         };
 
         let formula = crate::xmlwriter::escape_xml_data(formula);
-        let result = crate::xmlwriter::escape_xml_data(result);
+        let mut result = crate::xmlwriter::escape_xml_data(result);
+
+        if result == "TRUE" {
+            result = Cow::Owned("1".to_string());
+        }
+        if result == "FALSE" {
+            result = Cow::Owned("0".to_string());
+        }
 
         write!(
             writer,

tests/integration/formula_results01.rs

@@ -0,0 +1,79 @@
+// Test case that compares a file generated by rust_xlsxwriter with a file
+// created by Excel.
+//
+// SPDX-License-Identifier: MIT OR Apache-2.0
+//
+// Copyright 2022-2025, John McNamara, [email protected]
+
+use crate::common;
+use rust_xlsxwriter::{Workbook, XlsxError};
+
+// Create rust_xlsxwriter file to compare against Excel file.
+fn create_new_xlsx_file(filename: &str) -> Result<(), XlsxError> {
+    let mut workbook = Workbook::new();
+    let worksheet = workbook.add_worksheet();
+
+    worksheet
+        .write_formula(0, 0, "1+1")?
+        .set_formula_result(0, 0, "2");
+
+    worksheet
+        .write_formula(1, 0, "\"Foo\"")?
+        .set_formula_result(1, 0, "Foo");
+
+    worksheet
+        .write_formula(2, 0, "IF(B3,FALSE,TRUE)")?
+        .set_formula_result(2, 0, "TRUE");
+
+    worksheet
+        .write_formula(3, 0, "IF(B4,TRUE,FALSE)")?
+        .set_formula_result(3, 0, "FALSE");
+
+    worksheet
+        .write_formula(4, 0, "#DIV/0!")?
+        .set_formula_result(4, 0, "#DIV/0!");
+
+    worksheet
+        .write_formula(5, 0, "#N/A")?
+        .set_formula_result(5, 0, "#N/A");
+
+    worksheet
+        .write_formula(6, 0, "#NAME?")?
+        .set_formula_result(6, 0, "#NAME?");
+
+    worksheet
+        .write_formula(7, 0, "#NULL!")?
+        .set_formula_result(7, 0, "#NULL!");
+
+    worksheet
+        .write_formula(8, 0, "#NUM!")?
+        .set_formula_result(8, 0, "#NUM!");
+
+    worksheet
+        .write_formula(9, 0, "#REF!")?
+        .set_formula_result(9, 0, "#REF!");
+
+    worksheet
+        .write_formula(10, 0, "#VALUE!")?
+        .set_formula_result(10, 0, "#VALUE!");
+
+    worksheet
+        .write_formula(11, 0, "1/0")?
+        .set_formula_result(11, 0, "#DIV/0!");
+
+    workbook.save(filename)?;
+
+    Ok(())
+}
+
+#[test]
+fn test_formula_results01() {
+    let test_runner = common::TestRunner::new()
+        .set_name("formula_results01")
+        .set_function(create_new_xlsx_file)
+        .ignore_calc_chain()
+        .initialize();
+
+    test_runner.assert_eq();
+    test_runner.cleanup();
+}

tests/integration/main.rs

@@ -602,6 +602,7 @@ mod format21;
 mod format22;
 mod format23;
 mod format24;
+mod formula_results01;
 mod gridlines01;
 mod header_image01;
 mod header_image02;