diff --git a/tests/zip_images_resize_recursive.bats b/tests/zip_images_resize_recursive.bats
new file mode 100644
index 0000000..3e3e73e
--- /dev/null
+++ b/tests/zip_images_resize_recursive.bats
@@ -0,0 +1,64 @@
+#!/usr/bin/env bats
+
+load 'libs/bats-support/load'
+load 'libs/bats-assert/load'
+load 'helpers/common'
+
+SCRIPT="$REPO_ROOT/zip_images_resize_recursive.sh"
+
+setup() {
+    setup_mock_env
+}
+
+teardown() {
+    teardown_mock_env
+}
+
+@test "errors when argument is not a directory" {
+    run "$SCRIPT" /nonexistent/path
+    assert_failure
+    assert_output --partial "Error:"
+}
+
+@test "defaults to current directory when no argument given" {
+    make_zip "$TEST_WORKDIR/archive.zip" "$FIXTURES/unprocessed.jpg"
+    run bash -c "cd '$TEST_WORKDIR' && '$SCRIPT'"
+    assert_success
+    assert_output --partial "Resized"
+}
+
+@test "processes all ZIPs in a flat directory" {
+    make_zip "$TEST_WORKDIR/a.zip" "$FIXTURES/unprocessed.jpg"
+    make_zip "$TEST_WORKDIR/b.zip" "$FIXTURES/unprocessed.jpg"
+    run "$SCRIPT" "$TEST_WORKDIR"
+    assert_success
+    assert_equal "$(grep -c 'Resized' <<<"$output")" "2"
+}
+
+@test "skips already-processed ZIPs in a flat directory" {
+    make_zip "$TEST_WORKDIR/done.zip" "$FIXTURES/processed.jpg"
+    make_zip "$TEST_WORKDIR/todo.zip" "$FIXTURES/unprocessed.jpg"
+    run "$SCRIPT" "$TEST_WORKDIR"
+    assert_success
+    assert_output --partial "Skipping"
+    assert_output --partial "Resized"
+}
+
+@test "finds ZIPs recursively in subdirectories" {
+    mkdir -p "$TEST_WORKDIR/sub/deep"
+    make_zip "$TEST_WORKDIR/sub/a.zip"      "$FIXTURES/unprocessed.jpg"
+    make_zip "$TEST_WORKDIR/sub/deep/b.zip" "$FIXTURES/unprocessed.jpg"
+    run "$SCRIPT" "$TEST_WORKDIR"
+    assert_success
+    assert_equal "$(grep -c 'Resized' <<<"$output")" "2"
+}
+
+@test "no temp files left in /dev/shm after recursive run" {
+    make_zip "$TEST_WORKDIR/a.zip" "$FIXTURES/unprocessed.jpg"
+    make_zip "$TEST_WORKDIR/b.zip" "$FIXTURES/processed.jpg"
+    local before after
+    before=$(find /dev/shm -maxdepth 1 -name 'tmp.*' | sort)
+    run "$SCRIPT" "$TEST_WORKDIR"
+    after=$(find /dev/shm -maxdepth 1 -name 'tmp.*' | sort)
+    assert_equal "$before" "$after"
+}