diff --git a/.travis.yml b/.travis.yml
index 4c1d86b9..a99d0121 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,11 @@ python:
   - 3.4
   - 3.5
   - 3.6
-  - 3.7-dev
+matrix:
+  include:
+    - python: 3.7
+      dist: xenial
+      sudo: true
 install:
   - pip install pipenv --upgrade-strategy=only-if-needed
   - pipenv install --dev --skip-lock
diff --git a/HISTORY.md b/CHANGELOG.md
similarity index 85%
rename from HISTORY.md
rename to CHANGELOG.md
index 4cd557f7..dfcfbf06 100644
--- a/HISTORY.md
+++ b/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Release History
 
+## 2.1.2 (2019-04-17)
+
+**Features**
+
+- support new variable notation ${var}
+- use \$\$ to escape \$ notation
+- add Python 3.7 for travis CI
+
+**Bugfixes**
+
+- match duplicate variable/function in single raw string
+- escape '{' and '}' notation in raw string
+- print_info: TypeError when value is None
+- display api name when running api as testcase
+
 ## 2.1.1 (2019-04-11)
 
 **Features**
diff --git a/httprunner/__about__.py b/httprunner/__about__.py
index cc08e19b..2a95ad4c 100644
--- a/httprunner/__about__.py
+++ b/httprunner/__about__.py
@@ -1,7 +1,7 @@
 __title__ = 'HttpRunner'
 __description__ = 'One-stop solution for HTTP(S) testing.'
 __url__ = 'https://github.com/HttpRunner/HttpRunner'
-__version__ = '2.1.1'
+__version__ = '2.1.2'
 __author__ = 'debugtalk'
 __author_email__ = 'mail@debugtalk.com'
 __license__ = 'Apache-2.0'
diff --git a/httprunner/parser.py b/httprunner/parser.py
index b9c3a36c..08c0bdbd 100644
--- a/httprunner/parser.py
+++ b/httprunner/parser.py
@@ -7,10 +7,11 @@ import re
 from httprunner import exceptions, utils, validator
 from httprunner.compat import basestring, builtin_str, numeric_types, str
 
-# TODO: change variable notation from $var to {{var}}
-# $var_1
-variable_regex_compile = re.compile(r"\$(\w+)")
-# ${func1($var_1, $var_3)}
+# use $$ to escape $ notation
+dolloar_regex_compile = re.compile(r"\$\$")
+# variable notation, e.g. ${var} or $var
+variable_regex_compile = re.compile(r"\$\{(\w+)\}|\$(\w+)")
+# function notation, e.g. ${func1($var_1, $var_3)}
 function_regex_compile = re.compile(r"\$\{(\w+)\(([\$\w\.\-/\s=,]*)\)\}")
 
 
@@ -30,18 +31,32 @@ def parse_string_value(str_value):
         return str_value
 
 
-def is_variable_exist(content):
+def is_var_or_func_exist(content):
+    """ check if variable or function exist
+    """
     if not isinstance(content, basestring):
         return False
 
-    return True if variable_regex_compile.search(content) else False
-
-
-def is_function_exist(content):
-    if not isinstance(content, basestring):
+    try:
+        match_start_position = content.index("$", 0)
+    except ValueError:
         return False
 
-    return True if function_regex_compile.search(content) else False
+    while match_start_position < len(content):
+        dollar_match = dolloar_regex_compile.match(content, match_start_position)
+        if dollar_match:
+            match_start_position = dollar_match.end()
+            continue
+
+        func_match = function_regex_compile.match(content, match_start_position)
+        if func_match:
+            return True
+
+        var_match = variable_regex_compile.match(content, match_start_position)
+        if var_match:
+            return True
+
+        return False
 
 
 def regex_findall_variables(content):
@@ -68,7 +83,12 @@ def regex_findall_variables(content):
 
     """
     try:
-        return variable_regex_compile.findall(content)
+        vars_list = []
+        for var_tuple in variable_regex_compile.findall(content):
+            vars_list.append(
+                var_tuple[0] or var_tuple[1]
+            )
+        return vars_list
     except TypeError:
         return []
 
@@ -436,46 +456,73 @@ class LazyString(object):
             args: ["${func2($a, $b)}", "$c"]
 
         """
-        self._string = raw_string
-        args_mapping = {}
+        self._args = []
 
-        # Notice: functions must be handled before variables
-        # search function like ${func($a, $b)}
-        func_match_list = regex_findall_functions(self._string)
-        match_start_position = 0
-        for func_match in func_match_list:
-            func_str = "${%s(%s)}" % (func_match[0], func_match[1])
-            match_start_position = raw_string.index(func_str, match_start_position)
-            self._string = self._string.replace(func_str, "{}", 1)
-            function_meta = parse_function_params(func_match[1])
-            function_meta = {
-                "func_name": func_match[0]
-            }
-            function_meta.update(parse_function_params(func_match[1]))
-            lazy_func = LazyFunction(
-                function_meta,
-                self.functions_mapping,
-                self.check_variables_set
-            )
-            args_mapping[match_start_position] = lazy_func
+        def escape_braces(origin_string):
+            return origin_string.replace("{", "{{").replace("}", "}}")
 
-        # search variable like $var
-        var_match_list = regex_findall_variables(self._string)
-        match_start_position = 0
-        for var_name in var_match_list:
-            # check if any variable undefined in check_variables_set
-            if var_name not in self.check_variables_set:
-                raise exceptions.VariableNotFound(var_name)
+        try:
+            match_start_position = raw_string.index("$", 0)
+            begin_string = raw_string[0:match_start_position]
+            self._string = escape_braces(begin_string)
+        except ValueError:
+            self._string = escape_braces(raw_string)
+            return
 
-            var = "${}".format(var_name)
-            match_start_position = raw_string.index(var, match_start_position)
-            # TODO: escape '{' and '}'
-            # self._string = self._string.replace("{", "{{")
-            # self._string = self._string.replace("}", "}}")
-            self._string = self._string.replace(var, "{}", 1)
-            args_mapping[match_start_position] = var_name
+        while match_start_position < len(raw_string):
 
-        self._args = [args_mapping[key] for key in sorted(args_mapping.keys())]
+            # Notice: notation priority
+            # $$ > ${func($a, $b)} > $var
+
+            # search $$
+            dollar_match = dolloar_regex_compile.match(raw_string, match_start_position)
+            if dollar_match:
+                match_start_position = dollar_match.end()
+                self._string += "$"
+                continue
+
+            # search function like ${func($a, $b)}
+            func_match = function_regex_compile.match(raw_string, match_start_position)
+            if func_match:
+                function_meta = parse_function_params(func_match.group(1))
+                function_meta = {
+                    "func_name": func_match.group(1)
+                }
+                function_meta.update(parse_function_params(func_match.group(2)))
+                lazy_func = LazyFunction(
+                    function_meta,
+                    self.functions_mapping,
+                    self.check_variables_set
+                )
+                self._args.append(lazy_func)
+                match_start_position = func_match.end()
+                self._string += "{}"
+                continue
+
+            # search variable like ${var} or $var
+            var_match = variable_regex_compile.match(raw_string, match_start_position)
+            if var_match:
+                var_name = var_match.group(1) or var_match.group(2)
+                # check if any variable undefined in check_variables_set
+                if var_name not in self.check_variables_set:
+                    raise exceptions.VariableNotFound(var_name)
+
+                self._args.append(var_name)
+                match_start_position = var_match.end()
+                self._string += "{}"
+                continue
+
+            curr_position = match_start_position
+            try:
+                # find next $ location
+                match_start_position = raw_string.index("$", curr_position+1)
+                remain_string = raw_string[curr_position:match_start_position]
+            except ValueError:
+                remain_string = raw_string[curr_position:]
+                # break while loop
+                match_start_position = len(raw_string)
+
+            self._string += escape_braces(remain_string)
 
     def __repr__(self):
         return "LazyString({})".format(self.raw_string)
@@ -549,9 +596,11 @@ def prepare_lazy_data(content, functions_mapping=None, check_variables_set=None,
 
     elif isinstance(content, basestring):
         # content is in string format here
-        if not (is_variable_exist(content) or is_function_exist(content)):
+        if not is_var_or_func_exist(content):
             # content is neither variable nor function
-            return content
+            # replace $$ notation with $ and consider it as normal char.
+            # e.g. abc => abc, abc$$def => abc$def, abc$$$$def$$h => abc$$def$h
+            return content.replace("$$", "$")
 
         functions_mapping = functions_mapping or {}
         check_variables_set = check_variables_set or set()
@@ -1205,6 +1254,9 @@ def parse_tests(tests_mapping):
             # encapsulate api as a testcase
             for api_content in tests_mapping["apis"]:
                 testcase = {
+                    "config": {
+                        "name": api_content.get("name")
+                    },
                     "teststeps": [api_content]
                 }
                 parsed_testcase = _parse_testcase(testcase, project_mapping)
diff --git a/httprunner/utils.py b/httprunner/utils.py
index 89e728b5..e8e90747 100644
--- a/httprunner/utils.py
+++ b/httprunner/utils.py
@@ -385,6 +385,8 @@ def print_info(info_mapping):
             continue
         elif isinstance(value, (dict, list)):
             value = json.dumps(value)
+        elif value is None:
+            value = "None"
 
         if is_py2:
             if isinstance(key, unicode):
diff --git a/tests/httpbin/api/get_headers.yml b/tests/httpbin/api/get_headers.yml
index 9871035f..a05e5bd5 100644
--- a/tests/httpbin/api/get_headers.yml
+++ b/tests/httpbin/api/get_headers.yml
@@ -1,9 +1,11 @@
 
-name: headers
+name: get headers
 base_url: http://httpbin.org
+variables:
+    expected_status_code: 200
 request:
     url: /headers
     method: GET
 validate:
-    - eq: ["status_code", 200]
+    - eq: ["status_code", $expected_status_code]
     - eq: [content.headers.Host, "httpbin.org"]
diff --git a/tests/test_parser.py b/tests/test_parser.py
index fe5ad205..0675f198 100644
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -37,6 +37,10 @@ class TestParserBasic(unittest.TestCase):
             parser.regex_findall_variables("a$var"),
             ["var"]
         )
+        self.assertEqual(
+            parser.regex_findall_variables("a$var${var2}$var3${var4}"),
+            ["var", "var2", "var3", "var4"]
+        )
         self.assertEqual(
             parser.regex_findall_variables("$v ar"),
             ["v"]
@@ -281,7 +285,7 @@ class TestParserBasic(unittest.TestCase):
             {"abc": "def"}
         )
 
-    def test_lazy_string(self):
+    def test_parse_func_var_abnormal(self):
         variables_mapping = {
             "var_1": "abc",
             "var_2": "def",
@@ -295,6 +299,160 @@ class TestParserBasic(unittest.TestCase):
             "func1": lambda x,y: str(x) + str(y)
         }
 
+        # {
+        var = parser.LazyString("ABC$var_1{", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{{")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc{")
+
+        var = parser.LazyString("{ABC$var_1{}a}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "{{ABC{}{{}}a}}")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "{ABCabc{}a}")
+
+        var = parser.LazyString("AB{C$var_1{}a}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "AB{{C{}{{}}a}}")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "AB{Cabc{}a}")
+
+        # }
+        var = parser.LazyString("ABC$var_1}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}}}")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc}")
+
+        # $$
+        var = parser.LazyString("ABC$$var_1{", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC$var_1{{")
+        self.assertEqual(var._args, [])
+        self.assertEqual(var.to_value(variables_mapping), "ABC$var_1{")
+
+        # $$$
+        var = parser.LazyString("ABC$$$var_1{", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC${}{{")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABC$abc{")
+
+        # $$$$
+        var = parser.LazyString("ABC$$$$var_1{", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC$$var_1{{")
+        self.assertEqual(var._args, [])
+        self.assertEqual(var.to_value(variables_mapping), "ABC$$var_1{")
+
+        # ${
+        var = parser.LazyString("ABC$var_1${", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}${{")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc${")
+
+        var = parser.LazyString("ABC$var_1${a", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}${{a")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc${a")
+
+        # $}
+        var = parser.LazyString("ABC$var_1$}a", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}$}}a")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc$}a")
+
+        # }{
+        var = parser.LazyString("ABC$var_1}{a", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}}}{{a")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc}{a")
+
+        # {}
+        var = parser.LazyString("ABC$var_1{}a", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{{}}a")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc{}a")
+
+    def test_parse_func_var_duplicate(self):
+        variables_mapping = {
+            "var_1": "abc",
+            "var_2": "def",
+            "var_3": 123,
+            "var_4": {"a": 1},
+            "var_5": True,
+            "var_6": None
+        }
+        check_variables_set = variables_mapping.keys()
+        functions_mapping = {
+            "func1": lambda x,y: str(x) + str(y)
+        }
+        var = parser.LazyString(
+            "ABC${func1($var_1, $var_3)}--${func1($var_1, $var_3)}",
+            functions_mapping,
+            check_variables_set
+        )
+        self.assertEqual(var._string, "ABC{}--{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123--abc123")
+
+        var = parser.LazyString("ABC${func1($var_1, $var_3)}$var_1", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123abc")
+
+        var = parser.LazyString(
+            "ABC${func1($var_1, $var_3)}$var_1--${func1($var_1, $var_3)}$var_1",
+            functions_mapping,
+            check_variables_set
+        )
+        self.assertEqual(var._string, "ABC{}{}--{}{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123abc--abc123abc")
+
+    def test_parse_function(self):
+        variables_mapping = {
+            "var_1": "abc",
+            "var_2": "def",
+            "var_3": 123,
+            "var_4": {"a": 1},
+            "var_5": True,
+            "var_6": None
+        }
+        check_variables_set = variables_mapping.keys()
+        functions_mapping = {
+            "func1": lambda x,y: str(x) + str(y)
+        }
+
+        var = parser.LazyString("${func1($var_1, $var_3)}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "{}")
+        self.assertIsInstance(var._args[0], parser.LazyFunction)
+        self.assertEqual(var.to_value(variables_mapping), "abc123")
+
+        var = parser.LazyString("ABC${func1($var_1, $var_3)}DE", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}DE")
+        self.assertIsInstance(var._args[0], parser.LazyFunction)
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123DE")
+
+        var = parser.LazyString("ABC${func1($var_1, $var_3)}$var_5", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123True")
+
+        var = parser.LazyString("ABC${func1($var_1, $var_3)}DE$var_4", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}DE{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123DE{'a': 1}")
+
+        var = parser.LazyString("ABC$var_5${func1($var_1, $var_3)}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCTrueabc123")
+
+
+    def test_parse_variable(self):
+        """ variable format ${var} and $var
+        """
+        variables_mapping = {
+            "var_1": "abc",
+            "var_2": "def",
+            "var_3": 123,
+            "var_4": {"a": 1},
+            "var_5": True,
+            "var_6": None
+        }
+        check_variables_set = variables_mapping.keys()
+        functions_mapping = {}
+
+        # format: $var
         var = parser.LazyString("ABC$var_1", functions_mapping, check_variables_set)
         self.assertEqual(var._string, "ABC{}")
         self.assertEqual(var._args, ["var_1"])
@@ -320,22 +478,10 @@ class TestParserBasic(unittest.TestCase):
         self.assertEqual(var._args, ["var_1"])
         self.assertEqual(var.to_value(variables_mapping), "ABCabc$")
 
-        var = parser.LazyString("ABC$var_1{", functions_mapping, check_variables_set)
-        self.assertEqual(var._string, "ABC{}{")
-        self.assertEqual(var._args, ["var_1"])
-        # self.assertEqual(var.to_value(variables_mapping), "ABCabc{")
-
-        var = parser.LazyString("ABC$$var_1{", functions_mapping, check_variables_set)
-        self.assertEqual(var._string, "ABC${}{")
-        self.assertEqual(var._args, ["var_1"])
-
-        var = parser.LazyString("ABC$var_1${", functions_mapping, check_variables_set)
-        self.assertEqual(var._string, "ABC{}${")
-        self.assertEqual(var._args, ["var_1"])
-
-        var = parser.LazyString("ABC$var_1${a", functions_mapping, check_variables_set)
-        self.assertEqual(var._string, "ABC{}${a")
-        self.assertEqual(var._args, ["var_1"])
+        var = parser.LazyString("ABC$var_1/123$var_1/456", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}/123{}/456")
+        self.assertEqual(var._args, ["var_1", "var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc/123abc/456")
 
         var = parser.LazyString("ABC$var_1/$var_2/$var_1", functions_mapping, check_variables_set)
         self.assertEqual(var._string, "ABC{}/{}/{}")
@@ -347,27 +493,46 @@ class TestParserBasic(unittest.TestCase):
         self.assertEqual(var._args, ["var_1", "var_3"])
         self.assertEqual(var.to_value(variables_mapping), "func1(abc, 123)")
 
-        var = parser.LazyString("${func1($var_1, $var_3)}", functions_mapping, check_variables_set)
-        self.assertEqual(var._string, "{}")
-        self.assertIsInstance(var._args[0], parser.LazyFunction)
-        self.assertEqual(var.to_value(variables_mapping), "abc123")
+        # format: ${var}
+        var = parser.LazyString("ABC${var_1}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc")
 
-        var = parser.LazyString("ABC${func1($var_1, $var_3)}DE", functions_mapping, check_variables_set)
-        self.assertEqual(var._string, "ABC{}DE")
-        self.assertIsInstance(var._args[0], parser.LazyFunction)
-        self.assertEqual(var.to_value(variables_mapping), "ABCabc123DE")
-
-        var = parser.LazyString("ABC${func1($var_1, $var_3)}$var_5", functions_mapping, check_variables_set)
+        var = parser.LazyString("ABC${var_1}${var_3}", functions_mapping, check_variables_set)
         self.assertEqual(var._string, "ABC{}{}")
-        self.assertEqual(var.to_value(variables_mapping), "ABCabc123True")
+        self.assertEqual(var._args, ["var_1", "var_3"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123")
 
-        var = parser.LazyString("ABC${func1($var_1, $var_3)}DE$var_4", functions_mapping, check_variables_set)
-        self.assertEqual(var._string, "ABC{}DE{}")
-        self.assertEqual(var.to_value(variables_mapping), "ABCabc123DE{'a': 1}")
+        var = parser.LazyString("ABC${var_1}/${var_3}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}/{}")
+        self.assertEqual(var._args, ["var_1", "var_3"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc/123")
 
-        var = parser.LazyString("ABC$var_5${func1($var_1, $var_3)}", functions_mapping, check_variables_set)
-        self.assertEqual(var._string, "ABC{}{}")
-        self.assertEqual(var.to_value(variables_mapping), "ABCTrueabc123")
+        var = parser.LazyString("ABC${var_1}/", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}/")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc/")
+
+        var = parser.LazyString("ABC${var_1}123", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}123")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123")
+
+        var = parser.LazyString("ABC${var_1}/123${var_1}/456", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}/123{}/456")
+        self.assertEqual(var._args, ["var_1", "var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc/123abc/456")
+
+        var = parser.LazyString("ABC${var_1}/${var_2}/${var_1}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}/{}/{}")
+        self.assertEqual(var._args, ["var_1", "var_2", "var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc/def/abc")
+
+        var = parser.LazyString("func1(${var_1}, ${var_3})", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "func1({}, {})")
+        self.assertEqual(var._args, ["var_1", "var_3"])
+        self.assertEqual(var.to_value(variables_mapping), "func1(abc, 123)")
 
     def test_parse_data_multiple_identical_variables(self):
         variables_mapping = {
@@ -548,6 +713,37 @@ class TestParserBasic(unittest.TestCase):
         self.assertEqual(parsed_testcase["num2"], 6)
         self.assertEqual(parsed_testcase["num1"], 3)
 
+    def test_is_var_or_func_exist(self):
+        self.assertTrue(parser.is_var_or_func_exist("$var"))
+        self.assertTrue(parser.is_var_or_func_exist("${var}"))
+        self.assertTrue(parser.is_var_or_func_exist("$var${var}"))
+        self.assertFalse(parser.is_var_or_func_exist("${var"))
+        self.assertFalse(parser.is_var_or_func_exist("$$var"))
+        self.assertFalse(parser.is_var_or_func_exist("var$$0"))
+        self.assertTrue(parser.is_var_or_func_exist("var$$$0"))
+        self.assertFalse(parser.is_var_or_func_exist("var$$$$0"))
+        self.assertTrue(parser.is_var_or_func_exist("${func()}"))
+        self.assertTrue(parser.is_var_or_func_exist("${func($a)}"))
+        self.assertTrue(parser.is_var_or_func_exist("${func($a)}$b"))
+
+    def test_parse_variables_mapping_dollar_notation(self):
+        variables = {
+            "varA": "123$varB",
+            "varB": "456$$0",
+            "varC": "${sum_two($a, $b)}",
+            "a": 1,
+            "b": 2,
+            "c": "abc"
+        }
+        functions = {
+            "sum_two": sum_two
+        }
+        prepared_variables = parser.prepare_lazy_data(variables, functions, variables.keys())
+        parsed_testcase = parser.parse_variables_mapping(prepared_variables)
+        self.assertEqual(parsed_testcase["varA"], "123456$0")
+        self.assertEqual(parsed_testcase["varB"], "456$0")
+        self.assertEqual(parsed_testcase["varC"], 3)
+
     def test_prepare_lazy_data(self):
         variables = {
             "host": "https://httprunner.org",
@@ -584,6 +780,29 @@ class TestParserBasic(unittest.TestCase):
                 variables.keys()
             )
 
+    def test_prepare_lazy_data_dual_dollar(self):
+        variables = {
+            "num0": 123,
+            "var1": "abc$$num0",
+            "var2": "abc$$$num0",
+            "var3": "abc$$$$num0",
+        }
+        functions = {
+            "sum_two": sum_two
+        }
+        prepared_variables = parser.prepare_lazy_data(
+            variables,
+            functions,
+            variables.keys()
+        )
+        self.assertEqual(prepared_variables["var1"], "abc$num0")
+        self.assertIsInstance(prepared_variables["var2"], parser.LazyString)
+        self.assertEqual(prepared_variables["var3"], "abc$$num0")
+
+        parsed_variables = parser.parse_variables_mapping(prepared_variables)
+        self.assertEqual(parsed_variables["var1"], "abc$num0")
+        self.assertEqual(parsed_variables["var2"], "abc$123")
+        self.assertEqual(parsed_variables["var3"], "abc$$num0")
 
 class TestParser(unittest.TestCase):
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 9a804b2a..58138424 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -263,3 +263,15 @@ class TestUtils(ApiServerUnittest):
         parameters_content_list = []
         product_list = utils.gen_cartesian_product(*parameters_content_list)
         self.assertEqual(product_list, [])
+
+    def test_print_info(self):
+        info_mapping = {
+            "a": 1,
+            "t": (1, 2),
+            "b": {
+                "b1": 123
+            },
+            "c": None,
+            "d": [4, 5]
+        }
+        utils.print_info(info_mapping)
diff --git a/tests/testsuites/create_users_with_parameters.yml b/tests/testsuites/create_users_with_parameters.yml
index cd608af7..a134e956 100644
--- a/tests/testsuites/create_users_with_parameters.yml
+++ b/tests/testsuites/create_users_with_parameters.yml
@@ -1,5 +1,5 @@
 config:
-    name: create users with uid
+    name: create users with parameters
     variables:
         device_sn: ${gen_random_string(15)}
     base_url: "http://127.0.0.1:5000"