🧪 Add tests for clipping, echo and typing command

Added a simple test for each of the base command options: echo, type,
clip. It uses custom commands set through environment options so does
not yet test the actual default command logic (finding a typer,
clipper), that is still a TODO.

Also split tests into tests concerning commands of the program and tests
concerning the directory settings and options of the program, to avoid
ending up with a single test file spanning hundreds of lines.

test/bemoji_directories.bats

@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+
+setup_file() {
+    # make bemoji executable from anywhere relative to current testfile
+    TEST_DIR="$( cd "$( dirname "$BATS_TEST_FILENAME" )" >/dev/null 2>&1 && pwd )"
+    PATH="$TEST_DIR/..:$PATH"
+}
+
+setup() {
+    load 'test_helper/bats-support/load'
+    load 'test_helper/bats-assert/load'
+
+    # mock out interactive picker for static emoji return
+    export BEMOJI_PICKER_CMD="echo ❤️"
+
+    # set up small default set of test emoji for each test
+    export BEMOJI_DB_LOCATION="$BATS_TEST_TMPDIR/database"
+    export BEMOJI_CACHE_LOCATION="$BATS_TEST_TMPDIR/cache"
+    mkdir -p "$BEMOJI_DB_LOCATION" "$BEMOJI_CACHE_LOCATION"
+    cat "$BATS_TEST_DIRNAME/resources/test_emoji.txt" > "$BEMOJI_DB_LOCATION/emoji.txt"
+}
+
+@test "can run script" {
+    export BEMOJI_CLIP_CMD="echo clip test only"
+    # closing FD3 manually to prevent hangs, see
+    # https://bats-core.readthedocs.io/en/stable/writing-tests.html#file-descriptor-3-read-this-if-bats-hangs
+    run bemoji 3>&-
+    assert_success
+}
+
+@test "sets XDG directory for db by default" {
+    unset BEMOJI_DB_LOCATION
+    export XDG_DATA_HOME="$BATS_TEST_TMPDIR/xdb-db"
+    run bemoji -v
+    assert_output --regexp "
+database=$BATS_TEST_TMPDIR/xdb-db/bemoji
+"
+}
+
+@test "sets XDG directory for history by default" {
+    unset BEMOJI_CACHE_LOCATION
+    export XDG_CACHE_HOME="$BATS_TEST_TMPDIR/xdb-cache"
+    run bemoji -v
+    assert_output --regexp "
+history=$BATS_TEST_TMPDIR/xdb-cache/bemoji-history.txt$"
+}
+
+@test "falls back to default db directory if no XDG found" {
+    unset BEMOJI_DB_LOCATION
+    run bemoji -v
+    assert_output --regexp "
+database=$HOME/.local/share/bemoji
+"
+}
+
+@test "falls back to default history location if no XDG found" {
+    unset BEMOJI_CACHE_LOCATION
+    run bemoji -v
+    assert_output --regexp "
+history=$HOME/.cache/bemoji-history.txt$"
+}
+
+@test "BEMOJI_DB_LOCATION sets correct db directory" {
+    run bemoji -v
+    assert_output --regexp "
+database=$BATS_TEST_TMPDIR/database
+"
+}
+
+@test "BEMOJI_CACHE_LOCATION sets correct cache directory" {
+    run bemoji -v
+    assert_output --regexp "
+history=$BATS_TEST_TMPDIR/cache/bemoji-history.txt$"
+}