Add Automated testing workflow

.github/workflows/build-and-test-snap.yml

@@ -0,0 +1,72 @@
+name: Snap Build and Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  # Allow manual trigger
+  workflow_dispatch:
+
+jobs:
+  build-arm64:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform: 
+          - arm64
+    steps:
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: ${{ matrix.platform }}
+
+      - name: Build snap for arm64
+        uses: diddlesnaps/snapcraft-multiarch-action@v1
+        id: build
+        with:
+          architecture: ${{ matrix.platform }}
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: matter-pi-gpio-commander_${{ github.run_number}}_${{ matrix.platform }}.snap
+          path: ${{ steps.build.outputs.snap }}
+
+  build-and-test-amd64:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Inject amd64 build
+        run: tests/inject-amd64-arch.sh
+
+      - name: Build Snap
+        uses: snapcore/action-build@v1
+        id: snapcraft
+
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.*'
+          cache: false
+
+      - name: Run tests
+        working-directory: tests
+        env:
+          MOCK_GPIO: true
+          SKIP_TEARDOWN_REMOVAL: true
+          LOCAL_SERVICE_SNAP: ../${{ steps.snapcraft.outputs.snap }}
+        run: go test -failfast -p 1 -timeout 20m -v
+
+      - name: Upload snap logs
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: snap-logs
+          path: tests/*.log

.gitignore

@@ -2,3 +2,6 @@
 squashfs-root
 matter-pi-gpio-commander_*.txt
 test-blink
+
+# Ignore log files
+*.log

README.md

@@ -105,6 +105,7 @@ sudo snap connect matter-pi-gpio-commander:avahi-control
 > ```
 
 #### GPIO
+
 The gpio access is granted using the [`custom-device`](https://snapcraft.io/docs/custom-device-interface), which declares a slot to expose the `/dev/gpiochip*` device and also a plug to self connect.
 This interface is auto connected when installing the snap from the Snap Store.
 

snap/hooks/configure

@@ -9,7 +9,8 @@ if [[ -n $GPIO ]] && ! [[ $GPIO =~ ^[1-9][0-9]*$ ]]; then
 fi
 
 GPIOCHIP=$(snapctl get gpiochip)
-if (( GPIOCHIP != 0 && GPIOCHIP != 4 )); then
+VALIDATION=$(snapctl get gpiochip-validation)
+if [[ "$VALIDATION" == "true" ]] && (( GPIOCHIP != 0 && GPIOCHIP != 4 )); then
     logger -t $TAG --stderr "gpiochip: '$GPIOCHIP' is not supported; set to 0 or 4"
     exit 1
 fi

snap/hooks/install

@@ -2,3 +2,4 @@
 
 # Set defaults
 snapctl set gpiochip=0
+snapctl set gpiochip-validation=true

tests/README.md

@@ -0,0 +1,27 @@
+# Run Tests
+
+This section provides documentation on running tests and various scenarios.
+
+## Environment Variables
+
+To run the tests, you must set the following environment variables:
+
+- `SERVICE_CHANNEL`: The channel from which the snap will be downloaded if not using a local snap file. The default option is `latest/edge`.
+- `LOCAL_SERVICE_SNAP`: Path to the local service snap to be tested instead of downloading from a channel.
+- `SKIP_TEARDOWN_REMOVAL`: Skip the removal of snaps during teardown (useful when running on CI machines). The default option is `false`.
+- `MOCK_GPIO`: This is used to determine whether you wish to use gpio-mock to test the application instead of a physical gpiochip. Possible values are `true` or `false`. Important note: the usage of gpio-mock will only work if the snap is being installed from a local file; in other words, `LOCAL_SERVICE_SNAP` must be defined.
+- `GPIO_CHIP`: The GPIO chip number; accepted values are `0` (for legacy Raspberry Pis) or `4` for the Raspberry Pi 5. This doesn't need to be specified if using `USE_GPIO_MOCK`.
+- `GPIO_LINE`: This is the line offset to be used to test the selected gpiochip. The number of available lines can be checked with the `gpiodetect` and `gpioinfo` commands from the Debian package `gpiod`. This doesn't need to be specified if using `USE_GPIO_MOCK`.
+
+**Note:** The `USE_GPIO_MOCK` takes precedence over the specific `GPIO_CHIP` and `GPIO_LINE` settings if the former is set to "1"; thus, the other two are ignored.
+
+## Running tests
+
+```bash
+go test -v -failfast -count 1
+```
+
+where:
+- `-v` is to enable verbose output
+- `-failfast` makes the test stop after first failure
+- `-count 1` is to avoid Go test caching for example when testing a rebuilt snap

tests/go.mod

@@ -0,0 +1,15 @@
+module matter-pi-gpio-commander-tests
+
+go 1.21.6
+
+require (
+	github.com/canonical/matter-snap-testing v1.0.0-beta.1
+	github.com/stretchr/testify v1.8.4
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

tests/go.sum

@@ -0,0 +1,18 @@
+github.com/canonical/matter-snap-testing v1.0.0-beta.1 h1:obxh5jYRWgCw6QNax4+aY571h+q/zcPZBOP64gwd56E=
+github.com/canonical/matter-snap-testing v1.0.0-beta.1/go.mod h1:800wP9+ux8DW9Xr9QvlIdxFHlu85mqlhvlA2JO20aeQ=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

tests/gpio-mock.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+
+if [ "$1" = "teardown" ]; then
+	sudo rmmod gpio_mockup
+	rm -rf gpio-mockup
+	exit 0
+fi
+
+mkdir gpio-mockup
+cd gpio-mockup
+
+# Update and install dependencies
+sudo apt-get update
+sudo apt-get install -y linux-headers-$(uname -r)
+sudo apt-get install -y build-essential flex bison make
+
+kernel_major_minor=$(uname -r | cut -d'.' -f1-2)
+
+echo "Kernel major minor version: $kernel_major_minor"
+
+# Get GPIO Mockup driver
+wget https://raw.githubusercontent.com/torvalds/linux/v$kernel_major_minor/drivers/gpio/gpio-mockup.c
+wget https://raw.githubusercontent.com/torvalds/linux/v$kernel_major_minor/drivers/gpio/gpiolib.h
+
+# Create Makefile
+echo "
+obj-m = gpio-mockup.o
+KVERSION = \$(shell uname -r)
+all:
+	make -C /lib/modules/\$(KVERSION)/build M=\$(PWD) modules
+clean:
+	make -C /lib/modules/\$(KVERSION)/build M=\$(PWD) clean
+" > Makefile
+
+
+make -j$(nproc)
+
+sudo insmod gpio-mockup.ko gpio_mockup_ranges=-1,16 gpio_mockup_named_lines
+
+gpio_mock_chip=$(ls /dev/gpiochip* | sort -n | head -n 1)
+
+echo "GPIO Mockup chip: $gpio_mock_chip"
+
+cd ..

tests/inject-amd64-arch.sh

@@ -0,0 +1 @@
+ sed -i '/architectures:/a \ \ - build-on: amd64' snap/snapcraft.yaml