diff --git a/.github/blunderbuss.yml b/.github/blunderbuss.yml
new file mode 100644
index 00000000..37151ba5
--- /dev/null
+++ b/.github/blunderbuss.yml
@@ -0,0 +1,7 @@
+assign_prs:
+  - josephlewis42
+  - KaylaNguyen
+
+assign_issues:
+  - josephlewis42
+  - KaylaNguyen
diff --git a/.github/release-please.yml b/.github/release-please.yml
new file mode 100644
index 00000000..34e8f816
--- /dev/null
+++ b/.github/release-please.yml
@@ -0,0 +1,2 @@
+releaseType: php
+handleGHRelease: true
\ No newline at end of file
diff --git a/.github/renovate.json b/.github/renovate.json
new file mode 100644
index 00000000..32ac90d6
--- /dev/null
+++ b/.github/renovate.json
@@ -0,0 +1,15 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["group:allNonMajor", "schedule:monthly"],
+  "packageRules": [
+    {
+      "description": "Create a PR whenever there is a new major version",
+      "matchUpdateTypes": [
+        "major"
+      ]
+    }
+  ],
+  "ignorePaths": [
+    "examples/**"
+  ]
+}
diff --git a/.github/workflows/buildpack-integration-test.yml b/.github/workflows/buildpack-integration-test.yml
new file mode 100644
index 00000000..f61705fe
--- /dev/null
+++ b/.github/workflows/buildpack-integration-test.yml
@@ -0,0 +1,42 @@
+# Validates Functions Framework with GCF buildpacks.
+name: Buildpack Integration Test
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  php74-buildpack-test:
+    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.0
+    with:
+      http-builder-source: 'tests/conformance'
+      http-builder-target: 'declarativeHttpFunc'
+      cloudevent-builder-source: 'tests/conformance'
+      cloudevent-builder-target: 'declarativeCloudEventFunc'
+      prerun: 'tests/conformance/prerun.sh ${{ github.sha }}'
+      output-file: 'vendor/bin/function_output.json'
+      builder-runtime: 'php74'
+  php81-buildpack-test:
+    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.0
+    with:
+      http-builder-source: 'tests/conformance'
+      http-builder-target: 'declarativeHttpFunc'
+      cloudevent-builder-source: 'tests/conformance'
+      cloudevent-builder-target: 'declarativeCloudEventFunc'
+      prerun: 'tests/conformance/prerun.sh ${{ github.sha }}'
+      output-file: 'vendor/bin/function_output.json'
+      builder-runtime: 'php81'
+  php82-buildpack-test:
+    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.0
+    with:
+      http-builder-source: 'tests/conformance'
+      http-builder-target: 'declarativeHttpFunc'
+      cloudevent-builder-source: 'tests/conformance'
+      cloudevent-builder-target: 'declarativeCloudEventFunc'
+      prerun: 'tests/conformance/prerun.sh ${{ github.sha }}'
+      output-file: 'vendor/bin/function_output.json'
+      builder-runtime: 'php82'
\ No newline at end of file
diff --git a/.github/workflows/conformance.yml b/.github/workflows/conformance.yml
index adfcbdd0..dbcbf513 100644
--- a/.github/workflows/conformance.yml
+++ b/.github/workflows/conformance.yml
@@ -1,42 +1,49 @@
 name: PHP Conformance CI
 on:
-  pull_request:
-    branches:
-      - master
   push:
     branches:
-      - master
+      - main
+  pull_request:
   workflow_dispatch:
+
+# Declare default permissions as read only.
+permissions: read-all
+
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: [ '7.4','8.0' ]
+        php-version: [ '7.4','8.0','8.1','8.2' ]
     name: PHP ${{ matrix.php-version }} Conformance Test
     steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@03bee3930647ebbf994244c21ddbc0d4933aab4f # v2.3.0
+      with:
+        egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
+
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
 
     - name: Setup PHP ${{ matrix.php-version }}
-      uses: shivammathur/setup-php@v2
+      uses: shivammathur/setup-php@d30ad8b1843ace22e6698ab99bbafaa747b6bd0d # v2
       with:
         php-version: ${{ matrix.php-version }}
 
     - name: Install Dependencies
-      uses: nick-invision/retry@v1
+      uses: nick-invision/retry@39da88d5f7d15a96aed861dbabbe8b7443e3182a # v1.0.4
       with:
         timeout_minutes: 10
         max_attempts: 3
         command: composer install
 
     - name: Setup Go
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@bfdd3570ce990073878bf10f6b2d79082de49492 # v2.2.0
       with:
         go-version: '1.15'
 
     - name: Run HTTP conformance tests
-      uses: GoogleCloudPlatform/functions-framework-conformance/action@v1.2.1
+      uses: GoogleCloudPlatform/functions-framework-conformance/action@e42b1533877f1b639f508ec7fbcfb5be31aca663 # v1.2.1
       env:
         FUNCTION_TARGET: 'httpFunc'
         FUNCTION_SIGNATURE_TYPE: 'http'
@@ -48,7 +55,7 @@ jobs:
         cmd: "'php -S localhost:8080 router.php'"
 
     - name: Run Declarative HTTP conformance tests
-      uses: GoogleCloudPlatform/functions-framework-conformance/action@v1.2.1
+      uses: GoogleCloudPlatform/functions-framework-conformance/action@e42b1533877f1b639f508ec7fbcfb5be31aca663 # v1.2.1
       env:
         FUNCTION_TARGET: 'declarativeHttpFunc'
         FUNCTION_SOURCE: ${{ github.workspace }}/tests/conformance/index.php
@@ -59,7 +66,7 @@ jobs:
         cmd: "'php -S localhost:8080 router.php'"
 
     - name: Run CloudEvent conformance tests
-      uses: GoogleCloudPlatform/functions-framework-conformance/action@v1.2.1
+      uses: GoogleCloudPlatform/functions-framework-conformance/action@e42b1533877f1b639f508ec7fbcfb5be31aca663 # v1.2.1
       env:
         FUNCTION_TARGET: 'cloudEventFunc'
         FUNCTION_SIGNATURE_TYPE: 'cloudevent'
@@ -72,7 +79,7 @@ jobs:
         cmd: "'php -S localhost:8080 router.php'"
 
     - name: Run Declarative CloudEvent conformance tests
-      uses: GoogleCloudPlatform/functions-framework-conformance/action@v1.2.1
+      uses: GoogleCloudPlatform/functions-framework-conformance/action@e42b1533877f1b639f508ec7fbcfb5be31aca663 # v1.2.1
       env:
         FUNCTION_TARGET: 'declarativeCloudEventFunc'
         FUNCTION_SOURCE: ${{ github.workspace }}/tests/conformance/index.php
@@ -81,4 +88,4 @@ jobs:
         functionType: 'cloudevent'
         useBuildpacks: false
         validateMapping: true
-        cmd: "'php -S localhost:8080 router.php'"
\ No newline at end of file
+        cmd: "'php -S localhost:8080 router.php'"
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
new file mode 100644
index 00000000..033fd439
--- /dev/null
+++ b/.github/workflows/dependency-review.yml
@@ -0,0 +1,27 @@
+# Dependency Review Action
+#
+# This Action will scan dependency manifest files that change as part of a Pull Request,
+# surfacing known-vulnerable versions of the packages declared or updated in the PR.
+# Once installed, if the workflow run is marked as required, 
+# PRs introducing known-vulnerable packages will be blocked from merging.
+#
+# Source repository: https://github.com/actions/dependency-review-action
+name: 'Dependency Review'
+on: [pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  dependency-review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@03bee3930647ebbf994244c21ddbc0d4933aab4f # v2.3.0
+        with:
+          egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
+
+      - name: 'Checkout Repository'
+        uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3 # v3.5.0
+      - name: 'Dependency Review'
+        uses: actions/dependency-review-action@0efb1d1d84fc9633afcdaad14c485cbbc90ef46c # v2.5.1
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index 4973c9aa..55492ac8 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -2,14 +2,22 @@ name: PHP Lint CI
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
+permissions:
+  contents: read
+
 jobs:
   php-cs-fixer:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - name: Harden Runner
+      uses: step-security/harden-runner@03bee3930647ebbf994244c21ddbc0d4933aab4f # v2.3.0
+      with:
+        egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
+
+    - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
     - name: PHP-CS-Fixer
-      uses: docker://oskarstark/php-cs-fixer-ga
+      uses: docker://oskarstark/php-cs-fixer-ga:latest@sha256:73ae29e0cf222d3e132651af5bfb84ac3f210d58cd98e8f863d0b47f8ee0346f
       with:
         args: . --diff --dry-run
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
new file mode 100644
index 00000000..ab8aed99
--- /dev/null
+++ b/.github/workflows/scorecard.yml
@@ -0,0 +1,52 @@
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '0 */12 * * *' # runs every 12 hours
+  push:
+    branches: [ "main" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@03bee3930647ebbf994244c21ddbc0d4933aab4f # v2.3.0
+        with:
+          egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
+
+      - name: "Checkout code"
+        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@99c53751e09b9529366343771cc321ec74e9bd3d # v2.0.6
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # Public repositories:
+          #   - Publish results to OpenSSF REST API for easy access by consumers
+          #   - Allows the repository to include the Scorecard badge.
+          #   - See https://github.com/ossf/scorecard-action#publishing-results.
+          publish_results: true
+
+      # Upload the results to GitHub's code scanning dashboard.
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@807578363a7869ca324a79039e6db9c843e0e100 # v2.1.27
+        with:
+          sarif_file: results.sarif
diff --git a/.github/workflows/unit.yaml b/.github/workflows/unit.yaml
deleted file mode 100644
index 56ba817f..00000000
--- a/.github/workflows/unit.yaml
+++ /dev/null
@@ -1,29 +0,0 @@
-name: PHP Unit CI
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-jobs:
-  build:
-    runs-on: ${{ matrix.operating-system }}
-    strategy:
-      matrix:
-        operating-system: [ubuntu-latest]
-        php-versions: [ '7.4','8.0' ]
-    name: PHP ${{ matrix.php-versions }} Unit Test
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v2
-    - name: Uses PHP ${{ matrix.php-versions }}
-      uses: shivammathur/setup-php@v2
-      with:
-        php-version: ${{ matrix.php-versions }}
-    - name: Install Dependencies
-      uses: nick-invision/retry@v1
-      with:
-        timeout_minutes: 10
-        max_attempts: 3
-        command: composer install
-    - name: Run Script
-      run: vendor/bin/phpunit
\ No newline at end of file
diff --git a/.github/workflows/unit.yml b/.github/workflows/unit.yml
new file mode 100644
index 00000000..674043ec
--- /dev/null
+++ b/.github/workflows/unit.yml
@@ -0,0 +1,37 @@
+name: PHP Unit CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [ubuntu-latest]
+        php-versions: [ '7.4','8.0','8.1','8.2' ]
+    name: PHP ${{ matrix.php-versions }} Unit Test
+    steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@03bee3930647ebbf994244c21ddbc0d4933aab4f # v2.3.0
+      with:
+        egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
+
+    - name: Checkout
+      uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
+    - name: Uses PHP ${{ matrix.php-versions }}
+      uses: shivammathur/setup-php@d30ad8b1843ace22e6698ab99bbafaa747b6bd0d # v2
+      with:
+        php-version: ${{ matrix.php-versions }}
+    - name: Install Dependencies
+      uses: nick-invision/retry@39da88d5f7d15a96aed861dbabbe8b7443e3182a # v1.0.4
+      with:
+        timeout_minutes: 10
+        max_attempts: 3
+        command: composer install
+    - name: Run Script
+      run: vendor/bin/phpunit
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 00000000..38372e86
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,25 @@
+# Changelog
+
+## [1.2.0](https://github.com/GoogleCloudPlatform/functions-framework-php/compare/v1.1.0...v1.2.0) (2023-05-25)
+
+
+### Features
+
+* add class for testing ([#119](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/119)) ([41ab525](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/41ab52514051df9976285fa788a7e7239dec7715))
+
+
+### Miscellaneous Chores
+
+* [StepSecurity] Apply security best practices ([#137](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/137)) ([ed6afaa](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/ed6afaad643862d9a0912ca2539fa4f1de0c4ecc))
+* [StepSecurity] Apply security best practices ([#142](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/142)) ([e55fef1](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/e55fef1caf138837a2ca004bdd7498d92d311701))
+* add GCF buildpack integration test Workflow ([2da1fa3](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/2da1fa3ef34f632aa4179adef830972a5223b572))
+* add GCF buildpack integration test Workflow ([#129](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/129)) ([8db2c42](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/8db2c426cd0c0e4ae32abfe62b2dbf9f73b0b013))
+* configure security scorecard action ([#134](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/134)) ([a482dda](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/a482dda7017043ca41eefa6d4966fff8e8b08cff))
+* Create blunderbuss.yml according to preference ([#140](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/140)) ([395181d](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/395181ded7bbd17c59112c52308848901a82f80f))
+* Create renovate config ([#138](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/138)) ([eba4ec0](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/eba4ec09578131bfad90318b23cad364d21ab931))
+* fix invoker docblock ([#117](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/117)) ([6d4c545](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/6d4c545183d4c2eb9d89d981904b488c377acd4a))
+* make workflows' default permission read only ([#139](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/139)) ([d54e85f](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/d54e85f0c211c77c6de6c13c5f5dc921578b7d65))
+* Rename unit.yaml to unit.yml ([#136](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/136)) ([360b7d6](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/360b7d6605077f2977539e9d8b3455df44847ad3))
+* switch master to main ([#121](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/121)) ([c693c8c](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/c693c8c77166fab1fa88a8d47d3fb60768dc3c11))
+* update buildpack integration test ([#132](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/132)) ([e66d6f2](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/e66d6f20b166f5ae9d216051aacdc7f39815568a))
+* use Release Please for releases ([#126](https://github.com/GoogleCloudPlatform/functions-framework-php/issues/126)) ([d5c3589](https://github.com/GoogleCloudPlatform/functions-framework-php/commit/d5c3589012e2daeba963576eaf3748a7b4622b0f))
diff --git a/README.md b/README.md
index 6f097b4b..ce5b4a87 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
-# Functions Framework for PHP [![Build Status](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2FGoogleCloudPlatform%2Ffunctions-framework-php%2Fbadge&style=flat)](https://actions-badge.atrox.dev/GoogleCloudPlatform/functions-framework-php/goto) [![Packagist](https://poser.pugx.org/google/cloud-functions-framework/v/stable)](https://packagist.org/packages/google/cloud-functions-framework)
+# Functions Framework for PHP [![Packagist](https://poser.pugx.org/google/cloud-functions-framework/v/stable)](https://packagist.org/packages/google/cloud-functions-framework)
+
+[![PHP unit CI][ff_php_unit_img]][ff_php_unit_link] [![PHP lint CI][ff_php_lint_img]][ff_php_lint_link] [![PHP conformace CI][ff_php_conformance_img]][ff_php_conformance_link]
 
 An open source FaaS (Function as a service) framework for writing portable
 PHP functions.
@@ -196,7 +198,7 @@ gcloud run deploy my-cloud-function \
 After your instance deploys, you can access it at the URL provided, or view it
 in the [Cloud Console][cloud-run-console].
 
-[functions-samples]: https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/functions
+[functions-samples]: https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/functions
 [functions-how-to]: https://cloud.google.com/functions/docs/how-to
 [gcloud]: https://cloud.google.com/sdk/gcloud/
 [gcloud-auth]: https://cloud.google.com/sdk/docs/authorizing
@@ -215,7 +217,7 @@ cloudevent function signature:
 ```php
 use Google\CloudFunctions\CloudEvent;
 
-function helloCloudEvents(CloudEvent $cloudevent)
+function helloCloudEvent(CloudEvent $cloudevent)
 {
     // Print the whole CloudEvent
     $stdout = fopen('php://stdout', 'wb');
@@ -368,3 +370,10 @@ You can configure the Functions Framework using the environment variables shown
 
 Contributions to this library are welcome and encouraged. See
 [CONTRIBUTING](CONTRIBUTING.md) for more information on how to get started.
+
+[ff_php_unit_img]: https://github.com/GoogleCloudPlatform/functions-framework-php/workflows/PHP%20Unit%20CI/badge.svg
+[ff_php_unit_link]:  https://github.com/GoogleCloudPlatform/functions-framework-php/actions?query=workflow%3A"PHP+Unit+CI"
+[ff_php_lint_img]: https://github.com/GoogleCloudPlatform/functions-framework-php/workflows/PHP%20Lint%20CI/badge.svg
+[ff_php_lint_link]:  https://github.com/GoogleCloudPlatform/functions-framework-php/actions?query=workflow%3A"PHP+Lint+CI"
+[ff_php_conformance_img]: https://github.com/GoogleCloudPlatform/functions-framework-php/workflows/PHP%20Conformance%20CI/badge.svg
+[ff_php_conformance_link]:  https://github.com/GoogleCloudPlatform/functions-framework-php/actions?query=workflow%3A"PHP+Conformance+CI"
diff --git a/examples/hello/Dockerfile b/examples/hello/Dockerfile
index 20b178ca..15671b98 100644
--- a/examples/hello/Dockerfile
+++ b/examples/hello/Dockerfile
@@ -1,4 +1,4 @@
-FROM gcr.io/gae-runtimes/php74:php74_20210216_7_4_15_RC00
+FROM gcr.io/gae-runtimes/php74:php74_20210216_7_4_15_RC00@sha256:b7d4aef9e57c17152c2ea9a3fbd04c23687fc93c7254608bdf6e19f14a7c10f3
 
 WORKDIR /srv/
 
diff --git a/src/FunctionsFrameworkTesting.php b/src/FunctionsFrameworkTesting.php
new file mode 100644
index 00000000..08ee7fae
--- /dev/null
+++ b/src/FunctionsFrameworkTesting.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * Copyright 2021 Google LLC.
+ *
+ * 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.
+ */
+
+namespace Google\CloudFunctions;
+
+use ReflectionClass;
+
+class FunctionsFrameworkTesting
+{
+    private function __construct()
+    {
+        // Constructor disabled because this class should only be used statically.
+    }
+
+    public static function getRegisteredFunction(string $functionName)
+    {
+        $registeredFunctionsReflection = (new ReflectionClass(Invoker::class))
+            ->getProperty('registeredFunctions');
+        $registeredFunctionsReflection->setAccessible(true);
+
+        $fn = $registeredFunctionsReflection->getValue()[$functionName] ?? null;
+
+        if ($fn) {
+            $functionReflection = (new ReflectionClass($fn))
+                ->getProperty('function');
+            $functionReflection->setAccessible(true);
+
+            return $functionReflection->getValue($fn);
+        }
+    }
+}
diff --git a/src/Invoker.php b/src/Invoker.php
index d434a86b..a986d37b 100644
--- a/src/Invoker.php
+++ b/src/Invoker.php
@@ -29,18 +29,19 @@ class Invoker
 {
     private $function;
     private $errorLogFunc;
-    private static $registeredFunction = [];
+    private static $registeredFunctions = [];
 
     /**
      * @param array|string $target The callable to be invoked.
      * @param string|null $signatureType   The signature type of the target callable,
-     *                                     either "cloudevent" or "http". If null,
-     *                                     env var `FUNCTION_SIGNATURE_TYPE` is used.
+     *                                     either "cloudevent" or "http". This can be
+     *                                     null if $target is registered using
+     *                                     Invoker::registerFunction.
      */
     public function __construct($target, ?string $signatureType = null)
     {
-        if (is_string($target) && isset(self::$registeredFunction[$target])) {
-            $this->function = self::$registeredFunction[$target];
+        if (is_string($target) && isset(self::$registeredFunctions[$target])) {
+            $this->function = self::$registeredFunctions[$target];
         } else {
             if (!is_callable($target)) {
                 throw new InvalidArgumentException(sprintf(
@@ -104,6 +105,6 @@ public function handle(
      */
     public static function registerFunction(string $name, FunctionWrapper $function)
     {
-        self::$registeredFunction[$name] = $function;
+        self::$registeredFunctions[$name] = $function;
     }
 }
diff --git a/src/LegacyEventMapper.php b/src/LegacyEventMapper.php
index 3dc225d9..77f57a2a 100644
--- a/src/LegacyEventMapper.php
+++ b/src/LegacyEventMapper.php
@@ -23,7 +23,7 @@ class LegacyEventMapper
 {
     // Maps background/legacy event types to their equivalent CloudEvent types.
     // For more info on event mappings see
-    // https://github.com/GoogleCloudPlatform/functions-framework-conformance/blob/master/docs/mapping.md
+    // https://github.com/GoogleCloudPlatform/functions-framework-conformance/blob/main/docs/mapping.md
     private static $ceTypeMap = [
         'google.pubsub.topic.publish' => 'google.cloud.pubsub.topic.v1.messagePublished',
         'providers/cloud.pubsub/eventTypes/topic.publish' => 'google.cloud.pubsub.topic.v1.messagePublished',
diff --git a/tests/FunctionsFrameworkTest.php b/tests/FunctionsFrameworkTest.php
new file mode 100644
index 00000000..63907543
--- /dev/null
+++ b/tests/FunctionsFrameworkTest.php
@@ -0,0 +1,65 @@
+<?php
+/**
+ * Copyright 2021 Google LLC.
+ *
+ * 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.
+ */
+
+namespace Google\CloudFunctions\Tests;
+
+use Google\CloudFunctions\FunctionsFramework;
+use Google\CloudFunctions\FunctionsFrameworkTesting;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\ServerRequestInterface;
+use CloudEvents\V1\CloudEventInterface;
+
+/**
+ * @group gcf-framework
+ */
+class FunctionsFrameworkTest extends TestCase
+{
+    public function testRegisterAndRetrieveHttpFunction(): void
+    {
+        $fn = function (ServerRequestInterface $request) {
+            return "this is a test function";
+        };
+
+        FunctionsFramework::http('testFn', $fn);
+
+        $this->assertEquals(
+            $fn,
+            FunctionsFrameworkTesting::getRegisteredFunction('testFn')
+        );
+    }
+
+    public function testRegisterAndRetrieveCloudEventFunction(): void
+    {
+        $fn = function (CloudEventInterface $event) {
+            return "this is a test function";
+        };
+
+        FunctionsFramework::cloudEvent('testFn', $fn);
+
+        $this->assertEquals(
+            $fn,
+            FunctionsFrameworkTesting::getRegisteredFunction('testFn')
+        );
+    }
+
+    public function testRetrieveNonexistantFunction(): void
+    {
+        $this->assertNull(
+            FunctionsFrameworkTesting::getRegisteredFunction('thisDoesntExist')
+        );
+    }
+}
diff --git a/tests/conformance/prerun.sh b/tests/conformance/prerun.sh
new file mode 100755
index 00000000..69186fc2
--- /dev/null
+++ b/tests/conformance/prerun.sh
@@ -0,0 +1,27 @@
+# prerun.sh sets up the test function to use the functions framework commit
+# specified by generating a `composer.json`. This makes the function `pack` buildable
+# with GCF buildpacks.
+#
+# `pack` build example command:
+# pack build myfn --builder us.gcr.io/fn-img/buildpacks/php74/builder:php74_20220620_7_4_29_RC00 --env GOOGLE_RUNTIME=php74 --env GOOGLE_FUNCTION_TARGET=declarativeHttpFunc --env X_GOOGLE_TARGET_PLATFORM=gcf
+FRAMEWORK_VERSION=$1
+
+# exit when any command fails
+set -e
+
+cd $(dirname $0)
+
+if [ -z "${FRAMEWORK_VERSION}" ]
+    then
+        echo "Functions Framework version required as first parameter"
+        exit 1
+fi
+
+echo '{
+    "require": {
+        "google/cloud-functions-framework": "dev-main#'${FRAMEWORK_VERSION}'",
+        "cloudevents/sdk-php": "^1.0"
+    }
+}' > composer.json
+
+cat composer.json
\ No newline at end of file
diff --git a/run_conformance_tests.sh b/tests/conformance/run_conformance_tests.sh
similarity index 96%
rename from run_conformance_tests.sh
rename to tests/conformance/run_conformance_tests.sh
index bb284371..9fd74f62 100755
--- a/run_conformance_tests.sh
+++ b/tests/conformance/run_conformance_tests.sh
@@ -14,6 +14,12 @@
 # Defaults to the latest version of the repo, which may be ahead of the
 # latest release.
 
+# exit when any command fails
+set -e
+
+# Change into the repo root
+cd $(dirname $0)/../..
+
 CLIENT_VERSION=$1
 if [ $CLIENT_VERSION ]; then
     CLIENT_VERSION="@$CLIENT_VERSION"