🧪 Set up default emoji list for tests

Inject a tiny sample emoji list into each test so no download function
is engaged by default.
Add tests for version display.

test/bemoji.bats

@@ -7,6 +7,14 @@ setup() {
     # make bemoji executable from anywhere relative to current testfile
     TEST_DIR="$( cd "$( dirname "$BATS_TEST_FILENAME" )" >/dev/null 2>&1 && pwd )"
     PATH="$TEST_DIR/..:$PATH"
+
+    # mock out interactive picker for static emoji return
+    export BEMOJI_PICKER_CMD="echo ❤️"
+    # set up small default set of test emoji for each test
+    export BEMOJI_DB_LOCATION="$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 "test can run script" {
@@ -15,3 +23,15 @@ setup() {
     run bemoji 3>&-
     assert_success
 }
+
+@test "test receives custom picker mock output" {
+    run bemoji -e 3>&-
+    assert_output "❤️"
+}
+
+@test "-v prints correct version number" {
+    the_version=$(grep 'bm_version=' $(which bemoji))
+
+    run bemoji -v
+    assert_output "v${the_version#bm_version=}"
+}

test/resources/test_emoji.txt

@@ -0,0 +1,4 @@
+❤️ red heart
+😀 grinning face
+😃 grinning face with big eyes
+😄 grinning face with smiling eyes