diff --git a/mathics/builtin/datentime.py b/mathics/builtin/datentime.py
index 11a8f7fdc..c0c1aa858 100644
--- a/mathics/builtin/datentime.py
+++ b/mathics/builtin/datentime.py
@@ -454,7 +454,7 @@ class DateDifference(Builtin):
     """
 
     # FIXME: Since timedelta does not use large time units (years, months etc)
-    # this method can be innacuarate. The example below gives fractional Days
+    # this method can be inaccurate. The example below gives fractional Days
     # (20.1666666667 not 20).
 
     """
diff --git a/test/builtin/atomic/test_strings.py b/test/builtin/atomic/test_strings.py
index bdf4b0d01..959de26da 100644
--- a/test/builtin/atomic/test_strings.py
+++ b/test/builtin/atomic/test_strings.py
@@ -100,8 +100,8 @@ def test_alphabet(str_expr, str_expected, fail_msg, warnings):
             "StringContainsQ[{A, Galaxy, Far, Far, Away}, {F ~~ __ ~~ r, aw ~~ ___}]",
             None,
         ),
-        ## Mathematica can detemine correct invalid element in the pattern, it reports error:
-        ## Element F is not a valid string or pattern element in {F ~~ __ ~~ r, aw ~~ ___}.
+        # Mathematica can determine correct invalid element in the pattern, it reports error:
+        # Element F is not a valid string or pattern element in {F ~~ __ ~~ r, aw ~~ ___}.
         (
             'StringRepeat["x", 0]',
             ("A positive integer is expected at position 2 in StringRepeat[x, 0].",),
diff --git a/test/builtin/calculus/test_integrate.py b/test/builtin/calculus/test_integrate.py
index 135e0f932..212e9fb1e 100644
--- a/test/builtin/calculus/test_integrate.py
+++ b/test/builtin/calculus/test_integrate.py
@@ -17,7 +17,7 @@ def test_integrate():
         (
             "h=x;Integrate[Do[h=x*h,{5}]; h,x]",
             "x^7/7",
-            "a more agressive SymPy translation.",
+            "a more aggressive SymPy translation.",
         ),
     ):
         session.evaluate("Clear[h]; Clear[g]; Clear[f];")
diff --git a/test/builtin/list/test_eol.py b/test/builtin/list/test_eol.py
index 51338375a..0b7780ee4 100644
--- a/test/builtin/list/test_eol.py
+++ b/test/builtin/list/test_eol.py
@@ -50,7 +50,7 @@
             "x=.;a=.;b=.;c=.;f=.; g=.;d=.;m=.;n=.;Delete[1 + x ^ (a + b + c), {2, 2, 3}]",
             None,
             "1 + x ^ (a + b)",
-            "Faiing?",
+            "Failing?",
         ),
         ("Delete[f[a, g[b, c], d], {{2}, {2, 1}}]", None, "f[a, d]", None),
         (
diff --git a/test/builtin/numbers/test_algebra.py b/test/builtin/numbers/test_algebra.py
index 701ab4411..826151628 100644
--- a/test/builtin/numbers/test_algebra.py
+++ b/test/builtin/numbers/test_algebra.py
@@ -23,7 +23,7 @@ def test_collect():
 
 def test_coefficient():
     for str_expr, str_expected in (
-        # Form 1: Coefficent[expr, form]
+        # Form 1: Coefficient[expr, form]
         (
             "Coefficient[(x + 2)/(y - 3) + (x + 3)/(y - 2), z, 0]",
             "(2 + x) / (-3 + y) + (3 + x) / (-2 + y)",
@@ -50,7 +50,7 @@ def test_coefficient():
             "Coefficient[x^3 - 2 x/y + 3 x z, y]",
             "0",
         ),
-        # Form 2: Coefficent[expr, form, n]
+        # Form 2: Coefficient[expr, form, n]
         (
             "Coefficient[x^2 + axy^2 - bSin[c], c]",
             "0",
@@ -61,7 +61,7 @@ def test_coefficient():
 
 def test_coefficient_list():
     for str_expr, str_expected in (
-        # Form 1: Coefficent[expr, form]
+        # Form 1: Coefficient[expr, form]
         (
             "CoefficientList[x^2 + a x y^2 - b Sin[c], y]",
             "{-b Sin[c] + x ^ 2, 0, a x}",
@@ -359,10 +359,10 @@ def test_fullsimplify():
             "Coefficient[3 + x + y, 5]",
             None,
         ),
-        ## This is known bug of Sympy 1.0, next Sympy version will fix it by this commit
-        ## https://github.com/sympy/sympy/commit/25bf64b64d4d9a2dc563022818d29d06bc740d47
-        ("Coefficient[x * y, z, 0]", None, "x y", "Sympy 1.0 retuns 0"),
-        ## TODO: Support Modulus
+        # This is known bug of Sympy 1.0, next Sympy version will fix it by this commit
+        # https://github.com/sympy/sympy/commit/25bf64b64d4d9a2dc563022818d29d06bc740d47
+        ("Coefficient[x * y, z, 0]", None, "x y", "Sympy 1.0 returns 0"),
+        # TODO: Support Modulus
         # ("Coefficient[(x + 2)^3 + (x + 3)^2, x, 0, {Modulus -> 3, Modulus -> 2, Modulus -> 10}]",
         # None,"{2, 1, 7}", None),
         (
diff --git a/test/builtin/numbers/test_diffeqns.py b/test/builtin/numbers/test_diffeqns.py
index 7f445957a..b1168ca3a 100644
--- a/test/builtin/numbers/test_diffeqns.py
+++ b/test/builtin/numbers/test_diffeqns.py
@@ -66,7 +66,7 @@
             "DSolve[f[x] == 0, f, {}]",
             None,
         ),
-        # # Order of arguments shoudn't matter
+        # Order of arguments should not matter
         (
             "DSolve[D[f[x, y], x] == D[f[x, y], y], f, {x, y}]",
             None,
diff --git a/test/builtin/numbers/test_nintegrate.py b/test/builtin/numbers/test_nintegrate.py
index b3d9443a0..8e9dee43d 100644
--- a/test/builtin/numbers/test_nintegrate.py
+++ b/test/builtin/numbers/test_nintegrate.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 """
-Unit tests for mathics.buitin.numbers.nintegrate
+Unit tests for mathics.builtin.numbers.nintegrate
 
 NIntegrate[] tests
 
diff --git a/test/builtin/test_comparison.py b/test/builtin/test_comparison.py
index a2fc847c6..fc1c4644c 100644
--- a/test/builtin/test_comparison.py
+++ b/test/builtin/test_comparison.py
@@ -78,13 +78,13 @@
         ("g[a]<g[a]", "g[a] < g[a]", "not comparable expressions (like in WMA)"),
         ("g[1]<g[1]", "g[1] < g[1]", "not comparable expressions (like in WMA)"),
         #
-        ('Wo["x"]>3', "Wo[x] > 3", "isue #797"),
-        ('Wo["x"]<3', "Wo[x] < 3", "isue #797"),
-        ('Wo["x"]==3', "Wo[x] == 3", "isue #797"),
-        ('3>Wo["x"]', "3 > Wo[x]", "isue #797"),
-        ('3<Wo["x"]', "3 < Wo[x]", "isue #797"),
-        ('3==Wo["x"]', "3 == Wo[x]", "isue #797"),
-        ('Wo[f["x"],2]>0', "Wo[f[x], 2] > 0", "isue #797"),
+        ('Wo["x"]>3', "Wo[x] > 3", "issue #797"),
+        ('Wo["x"]<3', "Wo[x] < 3", "issue #797"),
+        ('Wo["x"]==3', "Wo[x] == 3", "issue #797"),
+        ('3>Wo["x"]', "3 > Wo[x]", "issue #797"),
+        ('3<Wo["x"]', "3 < Wo[x]", "issue #797"),
+        ('3==Wo["x"]', "3 == Wo[x]", "issue #797"),
+        ('Wo[f["x"],2]>0', "Wo[f[x], 2] > 0", "issue #797"),
         #
         # chained compare
         ("a != a != b", "False", "Strange MMA behavior"),
@@ -180,8 +180,8 @@ def test_sameq(str_lhs, str_rhs, str_expected):
     [  # UnsameQ returns True with 0 or 1 arguments
         ("UnsameQ[]", "True"),
         ("UnsameQ[expr]", "True"),
-        # With 2 or more argments, UnsameQ returns True if all expressions are
-        # structurally distinct and False otherwise
+        # With 2 or more arguments, UnsameQ returns True if all
+        # expressions are structurally distinct and False otherwise
         ("x =!= x", "False"),
         ("x =!= y", "True"),
         ("1 =!= 2 =!= 3 =!= 4", "True"),
diff --git a/test/builtin/test_datentime.py b/test/builtin/test_datentime.py
index 374cf174a..386136d90 100644
--- a/test/builtin/test_datentime.py
+++ b/test/builtin/test_datentime.py
@@ -34,16 +34,19 @@ def test_timeremaining():
 def test_timeconstrained1():
     """
     This test checks that
-    * TimeConstrained manages to return $Aborted when the
+
+    - ``TimeConstrained`` manages to return ``$Aborted`` when the
       evaluated expression exceeds the walltime.
-    * That the evaluation does not proceeds after the walltime.
 
-    If `Pause` and TimeConstrained were absolutely accurate,
+    - That the evaluation does not proceed after the walltime.
+
+    If ``Pause`` and ``TimeConstrained`` were absolutely accurate,
     `a` should be always less than 11. However, sometimes
-    the innacuracies in time could allow to reach more than 10
-    iterations before get stopped. 20 iterations should be a safe
+    the inaccuracies in time could allow to reach more than 10
+    iterations before being stopped. 20 iterations should be a safe
     bound.
-    After `TimeConstrained` returns `$Abort`, iterations should stop,
+
+    After ``TimeConstrained`` returns ``$Abort``, iterations should stop,
     so if we check one second after the end of the evaluation, `a`
     should not change its value.
     """
diff --git a/test/builtin/test_makeboxes.py b/test/builtin/test_makeboxes.py
index fdf31e420..c0a853332 100644
--- a/test/builtin/test_makeboxes.py
+++ b/test/builtin/test_makeboxes.py
@@ -252,7 +252,7 @@ def test_makeboxes_others_fail(str_expr, str_expected, msg):
         (
             r"MakeBoxes[G[F[2.]], StandardForm]",
             r'RowBox[{"G","[",RowBox[{"F","[","2.","]"}],"]"}]',
-            "Standard bahaviour",
+            "Standard behaviour",
         ),
         (
             r'MakeBoxes[F[x_], fmt_] := "F[" <> ToString[x] <> "]";MakeBoxes[G[F[3.002]], StandardForm]',
diff --git a/test/builtin/test_patterns.py b/test/builtin/test_patterns.py
index 389dee860..c0b0b4153 100644
--- a/test/builtin/test_patterns.py
+++ b/test/builtin/test_patterns.py
@@ -49,7 +49,7 @@ def test_replace_all():
             "Dispatch[]",
             "dispatch with 0 arguments",
         ),
-        ("Dispatch[a]", None, "Dispatch[a]", "A simbol. Keep unevaluated."),
+        ("Dispatch[a]", None, "Dispatch[a]", "A symbol. Keep unevaluated."),
         ("Dispatch[a -> b]", None, "Dispatch[<1>]", "single rule"),
         ("Dispatch[{}]", None, "{}", "empty rule"),
         ("Dispatch[{a -> 1}]", None, "Dispatch[<1>]", "single rule"),
diff --git a/test/builtin/test_strings.py b/test/builtin/test_strings.py
index 06fe91730..061e64925 100644
--- a/test/builtin/test_strings.py
+++ b/test/builtin/test_strings.py
@@ -323,8 +323,8 @@ def test_private_doctests_operations(str_expr, msgs, str_expected, fail_msg):
             "StringFreeQ[{A, Galaxy, Far, Far, Away}, {F ~~ __ ~~ r, aw ~~ ___}]",
             None,
         ),
-        ## Mathematica can detemine correct invalid element in the pattern, it reports error:
-        ## Element F is not a valid string or pattern element in {F ~~ __ ~~ r, aw ~~ ___}.
+        # Mathematica can determine correct invalid element in the pattern, it reports error:
+        # Element F is not a valid string or pattern element in {F ~~ __ ~~ r, aw ~~ ___}.
         ('StringMatchQ["abc1", LetterCharacter]', None, "False", None),
         ('StringMatchQ["abc", "ABC"]', None, "False", None),
         ('StringMatchQ["abc", "ABC", IgnoreCase -> True]', None, "True", None),
diff --git a/test/core/test_streams.py b/test/core/test_streams.py
index e7ead1cd1..54fbb8914 100644
--- a/test/core/test_streams.py
+++ b/test/core/test_streams.py
@@ -23,7 +23,7 @@ def test_path_search():
     for expect_find, expect_temporary, filename, assert_msg in (
         (True, False, "fortytwo`", "should find with .m extension"),
         (False, False, "fortytwo", "should not find without backtick (`) added"),
-        (True, False, "recursive-gcd`", "should find wit .wl extension"),
+        (True, False, "recursive-gcd`", "should find with .wl extension"),
     ):
         resolved_file, is_temporary = path_search(filename)
         assert expect_find == bool(resolved_file), assert_msg
diff --git a/test/eval/test_patterns.py b/test/eval/test_patterns.py
index bb2ae9efb..865080f06 100644
--- a/test/eval/test_patterns.py
+++ b/test/eval/test_patterns.py
@@ -20,7 +20,7 @@ def check_pattern(str_expr, str_pattern):
     expr = parse(defintions, MathicsSingleLineFeeder(str_expr))
     pattern = ExpressionPattern(parse(defintions, MathicsSingleLineFeeder(str_pattern)))
     ret = Matcher(pattern, session.evaluation).match(expr, session.evaluation)
-    assert ret == True
+    assert ret is True
 
 
 @pytest.mark.parametrize(