diff --git a/.github/workflows/hdl-build.yaml b/.github/workflows/hdl-build.yaml
new file mode 100644
index 0000000..0561321
--- /dev/null
+++ b/.github/workflows/hdl-build.yaml
@@ -0,0 +1,49 @@
+name: hdl-build
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the $default-branch branch
+  push:
+    branches:
+      - "*"
+  pull_request:
+    branches:
+      - "main"
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+permissions:
+  contents: read
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    runs-on: macos-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v4
+      
+    # Set up Python 
+    - name: Set up Python 3.13.1
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.13.1"
+
+    # Install Python dependencies and Cocotb
+    - name: Install dependencies
+      run: |
+        python3 -m pip install --upgrade pip
+        pip install flake8 pytest cocotb
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
+    # Install Verilator (MacOS)
+    - name: Set up Verilator (MacOS)
+      run: |
+        brew install verilator
+        
+    # Run tests
+    - name: Run Cocotb
+      run: |
+        pytest examples/
\ No newline at end of file
diff --git a/.github/workflows/properties/hdl-build.properties.json b/.github/workflows/properties/hdl-build.properties.json
new file mode 100644
index 0000000..7e01e23
--- /dev/null
+++ b/.github/workflows/properties/hdl-build.properties.json
@@ -0,0 +1,6 @@
+{
+    "name": "Python AES",
+    "description": "Create and test a AES Core and Modes.",
+    "iconName": "python",
+    "categories": ["Continuous integration", "Python", "Bottle", "Flask"]
+}
\ No newline at end of file
diff --git a/.github/workflows/python-app.yaml b/.github/workflows/python-app.yaml
index b2f56fb..1f34177 100644
--- a/.github/workflows/python-app.yaml
+++ b/.github/workflows/python-app.yaml
@@ -7,10 +7,14 @@ on:
   push:
     branches:
       - "*"
+    paths-ignore:
+      - "./.github/workflows/hdl-build.yaml"
   pull_request:
     branches:
       - "main"
 
+  workflow_dispatch:
+  
 permissions:
   contents: read
 
@@ -53,4 +57,4 @@ jobs:
         PYTHONPATH=src pytest test/nist/aesmmt/ -v
     - name: Test All
       run: | 
-        PYTHONPATH=src pytest -v
\ No newline at end of file
+        PYTHONPATH=src pytest test/ -v
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 75724d1..a00d614 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
-**/.venv
-**/.pytest_cache
-**/__pycache__
-**/.DS_Store
-nist/
\ No newline at end of file
+**/.venv/
+**/.pytest_cache/
+**/__pycache__/
+**/.DS_Store/
+nist/
+**/sim_build/
\ No newline at end of file
diff --git a/examples/cocotb/quickstart/Makefile b/examples/cocotb/quickstart/Makefile
new file mode 100644
index 0000000..9699047
--- /dev/null
+++ b/examples/cocotb/quickstart/Makefile
@@ -0,0 +1,20 @@
+# This file is public domain, it can be freely copied without restrictions.
+# SPDX-License-Identifier: CC0-1.0
+
+# Makefile
+
+# defaults
+SIM ?= icarus
+TOPLEVEL_LANG ?= verilog
+
+VERILOG_SOURCES += $(PWD)/my_design.sv
+# use VHDL_SOURCES for VHDL files
+
+# TOPLEVEL is the name of the toplevel module in your Verilog or VHDL file
+TOPLEVEL = my_design
+
+# MODULE is the basename of the Python test file
+MODULE = test_my_design
+
+# include cocotb's make rules to take care of the simulator setup
+include $(shell cocotb-config --makefiles)/Makefile.sim
diff --git a/examples/cocotb/quickstart/my_design.sv b/examples/cocotb/quickstart/my_design.sv
new file mode 100644
index 0000000..458ac8e
--- /dev/null
+++ b/examples/cocotb/quickstart/my_design.sv
@@ -0,0 +1,15 @@
+// This file is public domain, it can be freely copied without restrictions.
+// SPDX-License-Identifier: CC0-1.0
+
+module my_design(input logic clk);
+
+  timeunit 1ns;
+  timeprecision 1ns;
+
+  logic my_signal_1;
+  logic my_signal_2;
+
+  assign my_signal_1 = 1'bx;
+  assign my_signal_2 = 0;
+
+endmodule
diff --git a/examples/cocotb/quickstart/test_my_design.py b/examples/cocotb/quickstart/test_my_design.py
new file mode 100644
index 0000000..fa7a210
--- /dev/null
+++ b/examples/cocotb/quickstart/test_my_design.py
@@ -0,0 +1,50 @@
+# This file is public domain, it can be freely copied without restrictions.
+# SPDX-License-Identifier: CC0-1.0
+
+# test_my_design.py (simple)
+
+import cocotb
+from cocotb.triggers import Timer
+
+
+@cocotb.test()
+async def my_first_test(dut):
+    """Try accessing the design."""
+
+    for cycle in range(10):
+        dut.clk.value = 0
+        await Timer(1, units="ns")
+        dut.clk.value = 1
+        await Timer(1, units="ns")
+
+    dut._log.info("my_signal_1 is %s", dut.my_signal_1.value)
+    assert dut.my_signal_2.value[0] == 0, "my_signal_2[0] is not 0!"
+
+
+# test_my_design.py (extended)
+
+import cocotb
+from cocotb.triggers import FallingEdge, Timer
+
+
+async def generate_clock(dut):
+    """Generate clock pulses."""
+
+    for cycle in range(10):
+        dut.clk.value = 0
+        await Timer(1, units="ns")
+        dut.clk.value = 1
+        await Timer(1, units="ns")
+
+
+@cocotb.test()
+async def my_second_test(dut):
+    """Try accessing the design."""
+
+    await cocotb.start(generate_clock(dut))  # run the clock "in the background"
+
+    await Timer(5, units="ns")  # wait a bit
+    await FallingEdge(dut.clk)  # wait for falling edge/"negedge"
+
+    dut._log.info("my_signal_1 is %s", dut.my_signal_1.value)
+    assert dut.my_signal_2.value[0] == 0, "my_signal_2[0] is not 0!"
diff --git a/examples/cocotb/quickstart/test_runner.py b/examples/cocotb/quickstart/test_runner.py
new file mode 100644
index 0000000..f18eb77
--- /dev/null
+++ b/examples/cocotb/quickstart/test_runner.py
@@ -0,0 +1,29 @@
+# This file is public domain, it can be freely copied without restrictions.
+# SPDX-License-Identifier: CC0-1.0
+
+# test_runner.py
+
+import os
+from pathlib import Path
+
+from cocotb.runner import get_runner
+
+
+def test_my_design_runner():
+    sim = os.getenv("SIM", "verilator")
+
+    proj_path = Path(__file__).resolve().parent
+
+    sources = [proj_path / "my_design.sv"]
+
+    runner = get_runner(sim)
+    runner.build(
+        sources=sources,
+        hdl_toplevel="my_design",
+    )
+
+    runner.test(hdl_toplevel="my_design", test_module="test_my_design,")
+
+
+if __name__ == "__main__":
+    test_my_design_runner()
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..9aab68b
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,7 @@
+# pytest.ini
+[pytest]
+
+
+filterwarnings =
+    # cocotb pytest runners are experimental, ignore this warning
+    ignore:.*Python runners and associated APIs are an experimental feature.*:UserWarning