Add more tests to check that action works correctly with provided stable or beta version

tests/assert-cli-version.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+set -e
+
+OP_CLI_VERSION="$1"
+CLI_URL="https://app-updates.agilebits.com/product_history/CLI2"
+
+get_latest_cli_version() {
+    conditional_path="/beta/"
+    if [ "$1" == "non_beta" ]; then
+        conditional_path="!/beta/"
+    fi
+    # This long command parses the HTML page at "CLI_URL" and finds the latest CLI version
+    # based on the release channel we're looking for (stable or beta).
+    #
+    # The ideal call (i.e. 'curl https://app-updates.agilebits.com/check/1/0/CLI2/en/2.0.0/Y -s | jq -r .version')
+    # doesn't retrieve the latest CLI version on a channel basis.
+    # If the latest release is stable and we want the latest beta, this command will return the stable still.
+    OP_CLI_VERSION="$(curl -s $CLI_URL | awk -v RS='<h3>|</h3>' 'NR % 2 == 0 {gsub(/[[:blank:]]+/, ""); gsub(/<span[^>]*>|<\/span>|[\r\n]+/, ""); gsub(/&nbsp;.*$/, ""); if (!'"$1"' && '"$conditional_path"'){print; '"$1"'=1;}}')"
+}
+
+if [ "$OP_CLI_VERSION" == "latest" ]; then
+    get_latest_cli_version non_beta
+elif [ "$OP_CLI_VERSION" == "latest-beta" ]; then
+    get_latest_cli_version beta
+fi
+
+if [ "$(op --version)" != "$OP_CLI_VERSION" ]; then
+    echo -e "Expected CLI version to be:\n$OP_CLI_VERSION\nBut got:\n$(op --version)"
+    exit 1
+fi