diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index ae1ccb3..dc79b90 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -32,7 +32,8 @@
 				"evendead.help-me-add",
 				"charliermarsh.ruff",
 				"streetsidesoftware.code-spell-checker",
-				"njqdev.vscode-python-typehint"
+				"njqdev.vscode-python-typehint",
+				"Cameron.vscode-pytest"
 			]
 		}
 	}
diff --git a/.github/workflows/action_integration_test.yml b/.github/workflows/action_integration_test.yml
index 8228a1e..08563dc 100644
--- a/.github/workflows/action_integration_test.yml
+++ b/.github/workflows/action_integration_test.yml
@@ -1,62 +1,55 @@
-name: "GitHub Action integration test"
-
-permissions:
-  contents: write
-  pull-requests: write
-
-on:
-  pull_request:
-    branches:
-      - main
-  workflow_dispatch:
-
-jobs:
-  integration-test:
-    env:
-      report_json_file: InfraPatch_Statistics.json
-
-    name: "Run GitHub Action integration test"
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Run in report only mode
-        uses: ./
-        with:
-          report_only: true
-
-      - name: Run in update mode
-        id: update
-        uses: ./
-        with:
-          report_only: false
-          target_branch_name: "feat/infrapatch_test_${{ github.run_number }}"
-
-      - name: Check update result
-        shell: pwsh
-        run: |
-          $report = Get-Content $env:report_json_file -Raw | ConvertFrom-Json
-          if ( -not $report.total_resources -gt 0 ) {
-            throw "Failed to get resources"
-          }
-          if ( -not ( $report.resources_patched -gt 3 ) ) {
-              throw "No resources should be patched"
-          }
-          if ( $report.errors -gt 0 ) {
-              throw "Errors have been detected"
-          }
-
-      - name: Delete created branch$
-        if: always()
-        uses: dawidd6/action-delete-branch@v3
-        with:
-          github_token: ${{github.token}}
-          branches: ${{ steps.update.outputs.target_branch }}
-          soft_fail: true
-
-
-
-
-
-
+name: "GitHub Action integration test"
+
+on:
+  workflow_call:
+
+jobs:
+  integration-test:
+    env:
+      report_json_file: InfraPatch_Statistics.json
+
+    name: "Run GitHub Action integration test"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Run in report only mode
+        uses: ./
+        with:
+          report_only: true
+
+      - name: Run in update mode
+        id: update
+        uses: ./
+        with:
+          report_only: false
+          target_branch_name: "feat/infrapatch_test_${{ github.run_number }}"
+
+      - name: Check update result
+        shell: pwsh
+        run: |
+          $report = Get-Content $env:report_json_file -Raw | ConvertFrom-Json
+          if ( -not $report.total_resources -gt 0 ) {
+            throw "Failed to get resources"
+          }
+          if ( -not ( $report.resources_patched -gt 3 ) ) {
+              throw "No resources should be patched"
+          }
+          if ( $report.errors -gt 0 ) {
+              throw "Errors have been detected"
+          }
+
+      - name: Delete created branch$
+        if: always()
+        uses: dawidd6/action-delete-branch@v3
+        with:
+          github_token: ${{github.token}}
+          branches: ${{ steps.update.outputs.target_branch }}
+          soft_fail: true
+
+
+
+
+
+
diff --git a/.github/workflows/check_format_and_lint.yml b/.github/workflows/check_format_and_lint.yml
index 10ae4a8..6753ea9 100644
--- a/.github/workflows/check_format_and_lint.yml
+++ b/.github/workflows/check_format_and_lint.yml
@@ -1,24 +1,27 @@
+name: "Check Format and Lint Code"
+
 on:
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-      - closed
-    branches:
-      - main
+  workflow_call:
 
 jobs:
   check_code:
+    name: "Check Format and Lint Code"
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+
+      - name: Get Python Version
+        id: get_python_verion
+        run: |
+          python_version=$(cat python_version.txt)
+          echo "Using Python version $python_version"
+          echo "::set-output name=python_version::$(echo $python_version)"
         
       - name: Install Python
         uses: actions/setup-python@v2
         with:
-            python-version: 3.11
+            python-version: ${{ steps.get_python_verion.outputs.python_version }}
 
       - name: Install Dependencies
         run: |
@@ -31,4 +34,9 @@ jobs:
 
       - name: Check code with ruff
         run: ruff check .
-  
\ No newline at end of file
+
+
+
+
+
+
diff --git a/.github/workflows/cli-integration-test.yml b/.github/workflows/cli_integration_test.yml
similarity index 80%
rename from .github/workflows/cli-integration-test.yml
rename to .github/workflows/cli_integration_test.yml
index 610f9a7..46ef594 100644
--- a/.github/workflows/cli-integration-test.yml
+++ b/.github/workflows/cli_integration_test.yml
@@ -1,78 +1,79 @@
-name: CLI Integration test
-
-on:
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-      - closed
-    branches:
-      - main
-
-jobs:
-  test:
-    # only run if not closed or closed with merge
-    if: ${{ github.event.pull_request.merged == true || github.event.pull_request.state != 'closed' }}
-    env:
-      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      report_json_file: InfraPatch_Statistics.json
-
-    strategy:
-      matrix:
-        os:
-          - macos-latest
-          - ubuntu-latest
-          # - windows-latest Windows does currently not work because of pygohcl
-    runs-on: ${{ matrix.os }}
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Install Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: "3.11"
-
-      - name: Install InfraPatch CLI
-        run: |
-          python -m pip install .
-        shell: bash
-
-      - name: Run InfraPatch report
-        shell: bash
-        run: infrapatch --debug report --dump-json-statistics
-
-      - name: Check report result
-        shell: pwsh
-        run: |
-          $report = Get-Content $env:report_json_file -Raw | ConvertFrom-Json
-          if ( -not $report.total_resources -gt 0 ) {
-            throw "Failed to get resources"
-          }
-          if ( $report.resources_patched -ne 0 ) {
-              throw "No resources should be patched"
-          }
-          if ( $report.errors -gt 0 ) {
-              throw "Errors have been detected"
-          }
-
-      - name: Run InfraPatch update
-        shell: bash
-        run: infrapatch --debug update --dump-json-statistics --confirm
-
-      - name: Check update result
-        shell: pwsh
-        run: |
-          $report = Get-Content $env:report_json_file -Raw | ConvertFrom-Json
-          if ( -not $report.total_resources -gt 0 ) {
-            throw "Failed to get resources"
-          }
-          if ( -not ( $report.resources_patched -gt 3 ) ) {
-              throw "No resources should be patched"
-          }
-          if ( $report.errors -gt 0 ) {
-              throw "Errors have been detected"
-          }
-          
-          
+name: CLI Integration test
+
+on:
+  workflow_call:
+
+jobs:
+  cli_integration_test:
+    name: CLI Integration test
+    # only run if not closed or closed with merge
+    if: ${{ github.event.pull_request.merged == true || github.event.pull_request.state != 'closed' }}
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      report_json_file: InfraPatch_Statistics.json
+
+    strategy:
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+          # - windows-latest Windows does currently not work because of pygohcl
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Get Python Version
+        id: get_python_verion
+        run: |
+          python_version=$(cat python_version.txt)
+          echo "Using Python version $python_version"
+          echo "::set-output name=python_version::$(echo $python_version)"
+
+      - name: Install Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ steps.get_python_verion.outputs.python_version }}
+
+      - name: Install InfraPatch CLI
+        run: |
+          python -m pip install .
+        shell: bash
+
+      - name: Run InfraPatch report
+        shell: bash
+        run: infrapatch --debug report --dump-json-statistics
+
+      - name: Check report result
+        shell: pwsh
+        run: |
+          $report = Get-Content $env:report_json_file -Raw | ConvertFrom-Json
+          if ( -not $report.total_resources -gt 0 ) {
+            throw "Failed to get resources"
+          }
+          if ( $report.resources_patched -ne 0 ) {
+              throw "No resources should be patched"
+          }
+          if ( $report.errors -gt 0 ) {
+              throw "Errors have been detected"
+          }
+
+      - name: Run InfraPatch update
+        shell: bash
+        run: infrapatch --debug update --dump-json-statistics --confirm
+
+      - name: Check update result
+        shell: pwsh
+        run: |
+          $report = Get-Content $env:report_json_file -Raw | ConvertFrom-Json
+          if ( -not $report.total_resources -gt 0 ) {
+            throw "Failed to get resources"
+          }
+          if ( -not ( $report.resources_patched -gt 3 ) ) {
+              throw "No resources should be patched"
+          }
+          if ( $report.errors -gt 0 ) {
+              throw "Errors have been detected"
+          }
+          
+          
diff --git a/.github/workflows/composition.yml b/.github/workflows/composition.yml
new file mode 100644
index 0000000..a75d329
--- /dev/null
+++ b/.github/workflows/composition.yml
@@ -0,0 +1,36 @@
+name: InfraPatch Checks
+
+permissions:
+  contents: write
+  pull-requests: write
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+      - closed
+    branches:
+      - main
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+jobs:
+
+  check_code:
+    uses: ./.github/workflows/check_format_and_lint.yml
+
+  unit_tests:
+    needs: check_code
+    uses: ./.github/workflows/unit_tests.yml
+
+  cli_integration_test:
+    needs:  unit_tests
+    uses: ./.github/workflows/cli_integration_test.yml
+
+  github_action_integration_test:
+    needs:  unit_tests
+    uses: ./.github/workflows/action_integration_test.yml
+
diff --git a/.github/workflows/unit_tests.yml b/.github/workflows/unit_tests.yml
new file mode 100644
index 0000000..3807e5b
--- /dev/null
+++ b/.github/workflows/unit_tests.yml
@@ -0,0 +1,52 @@
+name: "Run Python Unit Tests"
+
+
+on:
+  workflow_call:
+
+jobs:
+  integration-test:
+    name: "Run Unit Tests"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Get Python Version
+        id: get_python_verion
+        run: |
+          python_version=$(cat python_version.txt)
+          echo "Using Python version $python_version"
+          echo "::set-output name=python_version::$(echo $python_version)"
+
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+            python-version: ${{ steps.get_python_verion.outputs.python_version }}
+
+      - name: Install Dependencies
+        run: |
+            python -m pip install --upgrade pip
+            pip install -r requirements.txt
+            pip install -r requirements-dev.txt
+
+      - name: Set timezone
+        uses: szenius/set-timezone@v1.2
+        with:
+          timezoneLinux: 'Europe/Berlin'
+
+      - name: Run pytest
+        uses: pavelzw/pytest-action@v2
+        with:
+            verbose: true
+            emoji: true
+            job-summary: true
+            click-to-expand: true
+            report-title: 'InfraPatch Unit-Tests Report'
+
+
+
+
+
+
+
diff --git a/.vscode/settings.json b/.vscode/settings.json
index be312f9..14ad595 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,43 +1,49 @@
-{
-  "terminal.integrated.env.osx": {
-    "PYTHONPATH": "${workspaceFolder}",
-  },
-  "terminal.integrated.env.linux": {
-    "PYTHONPATH": "${workspaceFolder}",
-  },
-  "terminal.integrated.env.windows": {
-    "PYTHONPATH": "${workspaceFolder}",
-  },
-  "[python]": {
-    "editor.formatOnSave": true,
-    "editor.codeActionsOnSave": {
-      "source.fixAll": true,
-      "source.organizeImports": true
-    },
-    "editor.defaultFormatter": "charliermarsh.ruff"
-  },
-  "files.autoSave": "afterDelay",
-  "python.analysis.inlayHints.functionReturnTypes": true,
-  "python.analysis.inlayHints.pytestParameters": true,
-  "python.analysis.inlayHints.variableTypes": true,
-  "python.languageServer": "Default",
-  "editor.defaultFormatter": "charliermarsh.ruff",
-  "python.missingPackage.severity": "Error",
-  "python.terminal.activateEnvInCurrentTerminal": true,
-  "cSpell.words": [
-    "infrapatch"
-  ],
-  "editor.formatOnPaste": true,
-  "editor.formatOnSave": true,
-  "python.analysis.autoImportCompletions": true,
-  "python.analysis.fixAll": [
-    "source.unusedImports",
-    "source.convertImportFormat"
-  ],
-  "python.analysis.typeCheckingMode": "basic",
-  "python.analysis.diagnosticMode": "workspace",
-  "editor.guides.indentation": false,
-  "editor.guides.bracketPairs": true,
-  "editor.guides.highlightActiveBracketPair": true,
-  "editor.guides.bracketPairsHorizontal": false,
+{
+  "terminal.integrated.env.osx": {
+    "PYTHONPATH": "${workspaceFolder}",
+  },
+  "terminal.integrated.env.linux": {
+    "PYTHONPATH": "${workspaceFolder}",
+  },
+  "terminal.integrated.env.windows": {
+    "PYTHONPATH": "${workspaceFolder}",
+  },
+  "[python]": {
+    "editor.formatOnSave": true,
+    "editor.codeActionsOnSave": {
+      "source.fixAll": true,
+      "source.organizeImports": true
+    },
+    "editor.defaultFormatter": "charliermarsh.ruff"
+  },
+  "files.autoSave": "afterDelay",
+  "python.analysis.inlayHints.functionReturnTypes": true,
+  "python.analysis.inlayHints.pytestParameters": true,
+  "python.analysis.inlayHints.variableTypes": true,
+  "python.languageServer": "Default",
+  "editor.defaultFormatter": "charliermarsh.ruff",
+  "python.missingPackage.severity": "Error",
+  "python.terminal.activateEnvInCurrentTerminal": true,
+  "cSpell.words": [
+    "infrapatch"
+  ],
+  "editor.formatOnPaste": true,
+  "editor.formatOnSave": true,
+  "python.analysis.autoImportCompletions": true,
+  "python.analysis.fixAll": [
+    "source.unusedImports",
+    "source.convertImportFormat"
+  ],
+  "python.analysis.typeCheckingMode": "basic",
+  "python.analysis.diagnosticMode": "workspace",
+  "editor.guides.indentation": false,
+  "editor.guides.bracketPairs": true,
+  "editor.guides.highlightActiveBracketPair": true,
+  "editor.guides.bracketPairsHorizontal": false,
+  "python.defaultInterpreterPath": "/usr/local/bin/python",
+  "python.testing.pytestArgs": [
+    "."
+  ],
+  "python.testing.unittestEnabled": false,
+  "python.testing.pytestEnabled": true,
 }
\ No newline at end of file
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index a0992ef..7bf227b 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -26,6 +26,15 @@
                 "reveal": "always"
             },
             "problemMatcher": []
+        },
+        {
+            "label": "pip install all dependencies",
+            "type": "shell",
+            "command": "pip3 install -r requirements.txt && pip3 install -r requirements-dev.txt",
+            "presentation": {
+                "reveal": "always"
+            },
+            "problemMatcher": []
         }
     ]
 }
\ No newline at end of file
diff --git a/infrapatch/action/tests/test___main__.py b/infrapatch/action/tests/test___main__.py
new file mode 100644
index 0000000..7a0c0ff
--- /dev/null
+++ b/infrapatch/action/tests/test___main__.py
@@ -0,0 +1,25 @@
+from infrapatch.action.__main__ import get_credentials_from_string
+
+
+def test_get_credentials_from_string():
+    # Test case 1: Empty credentials string
+    credentials_string = ""
+    expected_result = {}
+    assert get_credentials_from_string(credentials_string) == expected_result
+
+    # Test case 2: Single line credentials string
+    credentials_string = "username=abc123"
+    expected_result = {"username": "abc123"}
+    assert get_credentials_from_string(credentials_string) == expected_result
+
+    # Test case 3: Multiple line credentials string
+    credentials_string = "username=abc123\npassword=xyz789\ntoken=123456"
+    expected_result = {"username": "abc123", "password": "xyz789", "token": "123456"}
+    assert get_credentials_from_string(credentials_string) == expected_result
+
+    # Test case 4: Invalid credentials string
+    credentials_string = "username=abc123\npassword"
+    try:
+        get_credentials_from_string(credentials_string)
+    except Exception as e:
+        assert str(e) == "Error processing secrets: 'not enough values to unpack (expected 2, got 1)'"
diff --git a/pyproject.toml b/pyproject.toml
index 68c10f4..5b7e0c2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,4 +4,9 @@ line-length = 180
 
 [tool.ruff.lint]
 select = ["E4", "E7", "E9", "F"]
-ignore = []
\ No newline at end of file
+ignore = []
+
+[tool.pytest.ini_options]
+pythonpath = [
+  "."
+]
\ No newline at end of file
diff --git a/python_version.txt b/python_version.txt
new file mode 100644
index 0000000..902b2c9
--- /dev/null
+++ b/python_version.txt
@@ -0,0 +1 @@
+3.11
\ No newline at end of file
diff --git a/requirements-dev.txt b/requirements-dev.txt
index ede3eb4..e2d8d82 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1 +1,4 @@
-ruff
\ No newline at end of file
+ruff
+pytest
+pytest-md
+pytest-emoji
\ No newline at end of file