feat: auto testing github action

.github/documentation/tests.md

@@ -0,0 +1,26 @@
+# Tests
+
+## Table of Contents
+- [Description](#description)
+- [Jobs](#jobs)
+- [Credentials](#credentials)
+
+### Description 
+This workflow is triggered when a pull request is opened on the HyperBEAM main branch. Or manually via the Github Actions UI. It is responsible for installing and running the HyperBEAM rebar3 eunit tests.
+
+### Jobs
+
+The workflow consists of 1 main job:
+
+1. **test**: 
+    - Utilizes actions/checkout@v4 and erlef/setup-beam@v1 to create the Erlang ready environment in the github test runner.
+    - Iterates over each erlang module in Hyperbeam, running `rebar3 eunit --module modulename` on each, aggregating the results and successes.
+    - Generates and sends a Slack message if any tests failed, containing number of successes, and each module that failed.
+
+### Credentials
+
+There are 2 credentials used by this action, both stored in Github secrets. Settings -> Secrets and variables -> Actions. 
+
+`SLACK_BOT_TOKEN` and `SLACK_CHANNEL_ID`
+
+Generate the token in Slack, and grab the channel ID you want to send to, add those to the action secrets in Github, and the action will work.

.github/documentation/workflows.md

@@ -6,3 +6,4 @@ These workflows are GitHub Actions workflows that are used for a variety of CI/C
 ## Table of Contents
 
 - [CD](cd.md)
+- [Tests](tests.md)

.github/workflows/tests.yml

@@ -0,0 +1,109 @@
+name: Run hb tests
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - main
+    types:
+      - opened
+
+jobs:
+  test:
+    runs-on: ubuntu-22.04
+    name: Install Deps and Run Tests
+    strategy:
+      matrix:
+        otp: ['27.3.3']
+        rebar3: ['3.24.0']
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Erlang & rebar3
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{ matrix.otp }}
+          rebar3-version: ${{ matrix.rebar3 }}
+
+      - id: run_eunit
+        name: Run EUnit
+        shell: bash
+        run: |
+          set +e                      
+
+          failed=()
+          passed=0
+
+          for file in $(find src -type f -name '*.erl'); do
+            module=$(basename "$file" .erl)
+            echo "=== Testing module: $module ==="
+
+            # Capture output & exit code
+            output=$(rebar3 eunit --module $module 2>&1)
+            ret=$?
+            echo "$output"
+
+            # 1) Look for a summary line: “Failed: X.  Skipped: Y.  Passed: Z.”
+            pattern='Failed: [0-9]+\.\s*Skipped: [0-9]+\.\s*Passed: [0-9]+\.' 
+            if summary=$(
+              grep -E "$pattern" <<< "$output"
+            ); then
+              n=$(echo "$summary" | sed -n 's/.*Passed: \([0-9]\+\)\..*/\1/p')
+            # 2) Or if it's all-pass: “All N tests passed.”
+            elif echo "$output" | grep -qE 'All [0-9]+ tests passed\.'; then
+              n=$(echo "$output" | grep -oE 'All [0-9]+' | head -1 | awk '{print $2}')
+            # 3) Fallback: count lines ending in “ok”
+            else
+              n=$(echo "$output" | grep -cE '\.\.\.(\[[0-9. ]+ s\] )?ok$')
+            fi
+
+            passed=$((passed + n))
+
+            if [ $ret -ne 0 ]; then
+              failed+=("$module")
+            fi
+          done
+
+          # Export for downstream steps
+          echo "failed=${failed[*]}" >> $GITHUB_OUTPUT
+          echo "passed=${passed}"   >> $GITHUB_OUTPUT
+
+          # Print a summary in the log
+          echo
+          echo "✅ Total passed tests: $passed"
+          if [ ${#failed[@]} -gt 0 ]; then
+            echo
+            echo "❌ Failed modules: ${failed[*]}"
+            exit 1
+          fi
+
+
+      - name: Notify Slack on Failure
+        if: failure()
+        env:
+          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
+          SLACK_CHANNEL_ID: ${{ secrets.SLACK_CHANNEL_ID }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          PR_TITLE: ${{ github.event.pull_request.title }}
+          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+          FAILED_LIST: ${{ steps.run_eunit.outputs.failed }}
+          PASSED_COUNT: ${{ steps.run_eunit.outputs.passed }}
+        run: |
+          if [ "${GITHUB_EVENT_NAME}" = "pull_request" ]; then
+            TEXT="HyperBEAM tests failed on PR #${PR_NUMBER} ${PR_TITLE}. "
+          else
+            TEXT="HyperBEAM tests failed on main. "
+          fi
+
+          # append without spaces around =
+          TEXT="$TEXT❌ Failed modules: ${FAILED_LIST}. ✅ ${PASSED_COUNT} passed."
+
+          curl -X POST https://slack.com/api/chat.postMessage \
+            -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
+            -d "channel=$SLACK_CHANNEL_ID" \
+            -d "text=${TEXT} <${RUN_URL}|View test output>"
+
+
+
+