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diff --git a/resources/libraries/python/autogen/Testcase.py b/resources/libraries/python/autogen/Testcase.py
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+++ b/resources/libraries/python/autogen/Testcase.py
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+# Copyright (c) 2018 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Module defining utilities for testcase autogeneration."""
+
+from string import Template
+
+
+class Testcase(object):
+    """Class containing a template string and a substitution method."""
+
+    def __init__(self, template_string):
+        """Construct instance by storing template given by string.
+
+        :param template_string: Template string to generate test case code with.
+            See string.Template documentation for template string syntax.
+            Only the following placeholders are supported:
+            - cores_num - Number of cores as robot number, example: "${2}".
+            - cores_str - Number of physical cores to use, example: "2".
+            - frame_num - Framesize as a number, example: "${74}".
+            - frame_str - Framesize in upper case, example: "74B".
+            - tc_num - Start of testcase name, example: "tc04".
+        :type template_string: str
+        """
+        self.template = Template(template_string)
+
+    def generate(self, num, framesize, phy_cores):
+        """Return string of test case code with placeholders filled.
+
+        Fail if there are placeholders left unfilled.
+
+        :param num: Test case number. Example value: 4.
+        :param framesize: Imix string or numeric frame size. Example: 74.
+        :param phy_cores: Number of physical cores to use. Example: 2.
+        :type num: int
+        :type framesize: str or int
+        :type phy_cores: int or str
+        :returns: Filled template, usable as test case code.
+        :rtype: str
+        """
+        try:
+            fs = int(framesize)
+            subst_dict = {
+                "frame_num": "${%d}" % fs,
+                "frame_str": "%dB" % fs
+            }
+        except ValueError:  # Assuming an IMIX string.
+            subst_dict = {
+                "frame_num": str(framesize),
+                "frame_str": "IMIX"
+            }
+        cores_str = str(phy_cores)
+        cores_num = int(cores_str)
+        subst_dict.update(
+            {
+                "cores_num": "${%d}" % cores_num,
+                "cores_str": phy_cores,
+                "tc_num": "tc{num:02d}".format(num=num)
+            })
+        return self.template.substitute(subst_dict)