Add bats test suite

Black-box tests that run the script with stub commands on a minimal PATH and temp config/state folders.

tests/stubs/aur

@@ -0,0 +1,8 @@
+#!/bin/bash
+# "aur repo -u -d <repo>": prints $STUB_DATA/aur, exits $AUR_RC (default 0).
+printf '%s %s\n' "${0##*/}" "$*" >> "$STUB_DATA/calls"
+[[ ${1:-} == repo ]] || exit 1
+if [[ -s $STUB_DATA/aur ]]; then
+    printf '%s\n' "$(<"$STUB_DATA/aur")"
+fi
+exit "${AUR_RC:-0}"

tests/stubs/checkupdates

@@ -0,0 +1,8 @@
+#!/bin/bash
+# Prints $STUB_DATA/checkupdates; exits $CHECKUPDATES_RC, else 0 with updates and 2 without, like the real one.
+printf '%s %s\n' "${0##*/}" "$*" >> "$STUB_DATA/calls"
+if [[ -s $STUB_DATA/checkupdates ]]; then
+    printf '%s\n' "$(<"$STUB_DATA/checkupdates")"
+    exit "${CHECKUPDATES_RC:-0}"
+fi
+exit "${CHECKUPDATES_RC:-2}"

tests/stubs/fwupdmgr

@@ -0,0 +1,4 @@
+#!/bin/bash
+# Exits $FWUPD_RC: 0 = firmware updates available, 2 (default) = none.
+printf '%s %s\n' "${0##*/}" "$*" >> "$STUB_DATA/calls"
+exit "${FWUPD_RC:-2}"

tests/stubs/git-monitor

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+#!/bin/bash
+# Only needs to exist: the script checks for it with command -v.
+exit 0

tests/stubs/notify-send

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+#!/bin/bash
+# Appends the title, the body and a "--" line to $STUB_DATA/notify; exits $NOTIFY_RC (default 0).
+printf '%s\n' "$1" "$2" -- >> "$STUB_DATA/notify"
+exit "${NOTIFY_RC:-0}"

tests/stubs/pacdiff

@@ -0,0 +1,8 @@
+#!/bin/bash
+# "pacdiff -o": prints $STUB_DATA/pacdiff.
+printf '%s %s\n' "${0##*/}" "$*" >> "$STUB_DATA/calls"
+[[ ${1:-} == -o ]] || exit 1
+if [[ -s $STUB_DATA/pacdiff ]]; then
+    printf '%s\n' "$(<"$STUB_DATA/pacdiff")"
+fi
+exit 0

tests/stubs/pacman

@@ -0,0 +1,13 @@
+#!/bin/bash
+# "pacman -Q <pkg>": looks the package up in $STUB_DATA/installed ("name version" lines).
+[[ ${1:-} == -Q && $# == 2 ]] || { echo "pacman stub: unsupported arguments: $*" >&2; exit 1; }
+if [[ -f $STUB_DATA/installed ]]; then
+    while read -r name ver; do
+        if [[ $name == "$2" ]]; then
+            printf '%s %s\n' "$name" "$ver"
+            exit 0
+        fi
+    done < "$STUB_DATA/installed"
+fi
+printf "error: package '%s' was not found\n" "$2" >&2
+exit 1

tests/stubs/uname

@@ -0,0 +1,3 @@
+#!/bin/bash
+# "uname -r": prints $STUB_KERNEL.
+printf '%s\n' "$STUB_KERNEL"