Replace swath of redundant tests with working arg-parse test.

Author: Matt Pearson

arg-parsing-test.bats

@@ -0,0 +1,78 @@
+#!/usr/bin/env bats
+
+source lib/assert.bash
+source deploy.sh --source-only
+
+setup() {
+run mktemp -dt deploy_test.XXXX
+assert_success
+tmp=$output
+pushd "$tmp" >/dev/null
+}
+
+teardown() {
+popd >/dev/null
+rm -rf "$tmp"
+}
+
+set_env_vars() {
+# Set environment variables.
+export GIT_DEPLOY_USERNAME=env-username
+export GIT_DEPLOY_EMAIL=env-email
+export GIT_DEPLOY_APPEND_HASH=env-var
+}
+
+write_env_file() {
+# Write a '.env' file to override environment variables.
+cat <<-EOF > .env
+GIT_DEPLOY_EMAIL=dotenv-email
+GIT_DEPLOY_APPEND_HASH=env-file
+EOF
+}
+
+write_conf_file() {
+# Write a config-file to override '.env'.
+cat <<-EOF > conf
+GIT_DEPLOY_EMAIL=conf-email
+GIT_DEPLOY_APPEND_HASH=conf-file
+EOF
+}
+
+@test 'If not otherwise specified, use in-script default.' {
+parse_args
+assert that "$append_hash" = "true"
+}
+
+@test ' Environment variable overrides in-script default.' {
+set_env_vars
+
+parse_args
+assert that "$append_hash" = "env-var"
+}
+
+@test ' .env file overrides environment variables.' {
+set_env_vars
+write_env_file
+
+parse_args
+assert that "$append_hash" = "env-file"
+}
+
+@test ' conf file overrides .env file.' {
+set_env_vars
+write_env_file
+write_conf_file
+
+parse_args --config-file conf
+assert that "$append_hash" = "conf-file"
+}
+
+@test ' command-line overrides conf file.' {
+set_env_vars
+write_env_file
+write_conf_file
+
+parse_args --config-file conf --no-hash
+assert that "$append_hash" = "false"
+}
+