test: Add simple build tests

Add tests to verify that picocom builds and runs without any glaring
errors.

Author: larsks

.github/workflows/smoketest.yaml

@@ -0,0 +1,27 @@
+name: Smoke tests
+on:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  build-and-test:
+    strategy:
+      matrix:
+        distro: [fedora, ubuntu]
+    name: Build and test
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/picocom-ng/picocom-builder-${{ matrix.distro }}:main
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build
+        run: |
+          make
+
+      - name: Run tests
+        run: |
+          make smoketest

Makefile

@@ -102,3 +102,7 @@ realclean: distclean
 	rm -f picocom.1.html
 	rm -f picocom.1.pdf
 	rm -f CHANGES
+
+smoketest: picocom
+	bats tests/smoke
+

tests/smoke/README.md

@@ -0,0 +1 @@
+These are quick tests to validate that Picocom builds and runs without any errors.

tests/smoke/build.bats

@@ -0,0 +1,25 @@
+setup() {
+	BATS_TMPDIR="$(mktemp -d batsXXXXXX)"
+	gcc -o "${BATS_TMPDIR}/fakeserial" tests/smoke/fakeserial.c
+	read ptyname ptypid < <("${BATS_TMPDIR}/fakeserial")
+}
+
+@test "picocom builds successfully" {
+	make realclean all
+}
+
+@test "picocom runs --help successfully" {
+	./picocom --help
+}
+
+@test "picocom runs --exit successfully" {
+	timeout 5 ./picocom --exit $ptyname > "${BATS_TMPDIR}/log"
+	res=$?
+	(( $res == 0 ))
+	grep "Terminal ready" "${BATS_TMPDIR}/log"
+}
+
+teardown() {
+	kill $ptypid
+	rm -rf "${BATS_TMPDIR}"
+}

tests/smoke/fakeserial.c

@@ -0,0 +1,37 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <pty.h>
+#include <limits.h>
+#include <errno.h>
+#include <string.h>
+
+int main(int argc, char *argv[]) {
+    int porta, portb;
+    char ptyname[PATH_MAX];
+    pid_t pid;
+
+    if (openpty(&porta, &portb, ptyname, NULL, NULL) != 0) {
+        fprintf(stderr, "ERROR: failed to open pty (%d): %s\n", errno, strerror(errno));
+        exit(1);
+    }
+
+    switch(pid = fork()) {
+        case -1:
+            fprintf(stderr, "ERROR: failed to start background process (%d): %s", errno, strerror(errno));
+            exit(1);
+            break;
+        case 0:
+            pause();
+            exit(0);
+            break;
+
+        default:
+            close(porta);
+            close(portb);
+            break;
+    }
+
+    printf("%s %d\n", ptyname, pid);
+    return 0;
+}