diff --git a/src/Mod/Spreadsheet/CMakeLists.txt b/src/Mod/Spreadsheet/CMakeLists.txt
index 42dea69cc3..212b7d316d 100644
--- a/src/Mod/Spreadsheet/CMakeLists.txt
+++ b/src/Mod/Spreadsheet/CMakeLists.txt
@@ -8,6 +8,7 @@ set(Spreadsheet_Scripts
     Init.py
     TestSpreadsheet.py
     importXLSX.py
+    test_importXLSX.py
 )
 
 if(BUILD_GUI)
diff --git a/src/Mod/Spreadsheet/importXLSX.py b/src/Mod/Spreadsheet/importXLSX.py
index c59014446b..d7c15cdf9e 100644
--- a/src/Mod/Spreadsheet/importXLSX.py
+++ b/src/Mod/Spreadsheet/importXLSX.py
@@ -225,7 +225,7 @@ class FormulaTranslator(object):
             else:
                 # print('There is a branch. look up: ', theExpr[1])
                 if (lenExpr > 1) and (theExpr[1] in treeDict[branch]):
-                    branch = treeDict[branch][theExpr[0]]
+                    branch = treeDict[branch][theExpr[1]]
                     if branch is None:
                         keyToken = True
                     else:
diff --git a/src/Mod/Spreadsheet/test_importXLSX.py b/src/Mod/Spreadsheet/test_importXLSX.py
new file mode 100644
index 0000000000..2b4d2ac7af
--- /dev/null
+++ b/src/Mod/Spreadsheet/test_importXLSX.py
@@ -0,0 +1,98 @@
+import unittest
+from unittest.mock import patch, MagicMock
+
+from importXLSX import FormulaTranslator, getText, handleStrings, open
+
+
+class TestFormulaTranslator(unittest.TestCase):
+    def test_translate_expressions(self):
+        # With
+        formulas_and_expressions = [
+            ("1=2", "1==2"),
+            ("a<b", "a<b"),
+            ("a>b", "a>b"),
+            ("1<>2", "1!=2"),
+            ("a>=b", "a>=b"),
+            ("a<=b", "a<=b"),
+            ("a!b", "a.b"),
+            ("a+b", "a+b"),
+            ("a-b", "a-b"),
+            ("a*b", "a*b"),
+            ("a/b", "a/b"),
+            ("a^b", "a^b"),
+            ("c*(a+b)", "c*(a+b)"),
+            ("IF(a=b, c, d)", "(a==b? c: d)"),
+            ("ABS(a)", "abs(a)"),
+            ("ACOS(a)", "pi/180deg*acos(a)"),
+            ("ASIN(a)", "pi/180deg*asin(a)"),
+            ("ATAN(a)", "pi/180deg*atan(a)"),
+            ("ATAN2(a)", "pi/180deg*atan2(a)"),
+            ("COS(a)", "cos(1rad*(a))"),
+            ("COSH(a)", "cosh(1rad*(a))"),
+            ("EXP(a)", "exp(a)"),
+            ("LOG(n)", "log(n)"),
+            ("LOG10(n)", "log10(n)"),
+            ("MOD(n,d)", "mod(n,d)"),
+            ("POWER(n,p)", "pow(n,p)"),
+            ("SIN(a)", "sin(1rad*(a))"),
+            ("SINH(a)", "sinh(1rad*(a))"),
+            ("SQRT(a)", "sqrt(a)"),
+            ("TAN(a)", "tan(1rad*(a))"),
+            ("TANH(a)", "tanh(1rad*(a))"),
+            ("AVERAGE(a,b,c)", "average(a,b,c)"),
+            ("COUNT(a,b,c)", "count(a,b,c)"),
+            ("MAX(a,b,c)", "max(a,b,c)"),
+            ("MIN(a,b,c)", "min(a,b,c)"),
+            ("STDEVA(a,b,c)", "stddev(a,b,c)"),
+            ("SUM(a,b,c)", "sum(a,b,c)"),
+            ("PI", "pi"),
+            ("_xlfn.CEILING.MATH(a)", "ceil(a)"),
+            ("_xlfn.FLOOR.MATH(a)", "floor(a)"),
+        ]
+
+        # When
+        result = []
+        for formula, _ in formulas_and_expressions:
+            translator = FormulaTranslator()
+            result.append(translator.translateForm(formula))
+
+        # Then
+        expected = [f"={expression}" for _, expression in formulas_and_expressions]
+        self.assertListEqual(expected, result)
+
+    def test_translate_multi_character_branching_operators(self):
+        # With
+        formulas_and_expressions = [
+            ("1<>2", "1!=2"),
+            ("a>=b", "a>=b"),
+            ("a<=b", "a<=b"),
+        ]
+
+        # When
+        result = []
+        for formula, _ in formulas_and_expressions:
+            translator = FormulaTranslator()
+            result.append(translator.translateForm(formula))
+
+        # Then
+        expected = [f"={expression}" for _, expression in formulas_and_expressions]
+        self.assertListEqual(expected, result)
+
+    def test_translate_nested_expression(self):
+        # With
+        formulas_and_expressions = [
+            (
+                "IF(a<b+c,0.1+SIN(0.5),0.3+MAX(COS(0.2),SIN(0.1)))",
+                "(a<b+c?0.1+sin(1rad*(0.5)):0.3+max(cos(1rad*(0.2)),sin(1rad*(0.1))))",
+            ),
+        ]
+
+        # When
+        result = []
+        for formula, _ in formulas_and_expressions:
+            translator = FormulaTranslator()
+            result.append(translator.translateForm(formula))
+
+        # Then
+        expected = [f"={expression}" for _, expression in formulas_and_expressions]
+        self.assertListEqual(expected, result)