Add unit tests under tests directory for backend

tests/backend_test/README.md

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+# Backend Dev Testing
+
+## Description
+
+- main.sh is the parent file that contains all the tests
+- assert.sh is the code used for the base functions needed to test the backend.
+
+## Requirements:
+Fill the values required below in test_backend.tfvars 
+
+- Storage Account Name
+- Storage Account Access Key
+- Storage Account Container Name
+- Key Name to store for Terraform State for Test Environment
+
+#### Folder test1 contains test1.tf
+1. Deploy Resource Group
+2. Deploy KeyVault1
+- Should deploy above resources
+
+#### Folder test2 contains test2.tf
+1. Deploy Resource Group
+2. Deploy KeyVault1
+3. Deploy KeyVault2 
+- Should not change/deploy resource 1 and 2. Only deploy resource 3.
+
+#### Folder test3 contains test3.tf
+1. Deploy Resource Group
+2. Deploy KeyVault1
+3. Deploy KeyVault2
+- Should not deploy any resource since above 3 resources are already deployed.
+
+## Usage
+``` bash
+./main.sh
+```

tests/backend_test/main.sh

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+#!/bin/bash
+set -euo pipefail
+
+. ../assert.sh continue_on_error #  load test functions with continue_on_error/stop_on_error
+
+#Cleanup
+terraform init -backend-config=./test_backend.tfvars test3
+terraform destroy -auto-approve test3
+
+#Check if resource group exists
+#Resource group does not exists #Fail
+printf "\e[0;31mIf below test 'Failed' then test passed \n"
+assertRG rg-test-cblt-msft
+
+#Create Resource group and Keyvault 1
+terraform init -backend-config=./test_backend.tfvars test1
+terraform apply -auto-approve test1
+
+#Check if resource group exists
+assertRG rg-test-cblt-msft
+assertResource rg-test-cblt-msft "Microsoft.KeyVault/vaults" kv1-test-cblt-msft
+
+#Key Vault 2 does not exists #Fail
+printf "\e[0;31mIf below test 'Failed' then test passed \n"
+assertResource rg-test-cblt-msft "Microsoft.KeyVault/vaults" kv2-test-cblt-msft
+
+terraform init -backend-config=./test_backend.tfvars test2
+terraform apply -auto-approve test2
+
+assertRG rg-test-cblt-msft
+assertResource rg-test-cblt-msft "Microsoft.KeyVault/vaults" kv1-test-cblt-msft
+assertResource rg-test-cblt-msft "Microsoft.KeyVault/vaults" kv2-test-cblt-msft
+before=`az resource list -g rg-test-cblt-msft --resource-type "Microsoft.KeyVault/vaults"|jq .[].name| wc -l`
+
+
+terraform init -backend-config=./test_backend.tfvars test3
+terraform apply -auto-approve test3
+after=`az resource list -g rg-test-cblt-msft --resource-type "Microsoft.KeyVault/vaults"|jq .[].name| wc -l`
+assertRG rg-test-cblt-msft
+assertResource rg-test-cblt-msft "Microsoft.KeyVault/vaults" kv1-test-cblt-msft
+assertResource rg-test-cblt-msft "Microsoft.KeyVault/vaults" kv2-test-cblt-msft
+
+if [ $before -eq $after ]
+then
+    printf "\e[0;32mTest Passed: Number of resources in resource group are the same before and after the current test \n"
+else
+    printf "\e[0;31mTest Failed... \n"
+fi
+
+terraform destroy -auto-approve test3

tests/backend_test/test1/test1.tf

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+provider "azurerm" {
+    version = "~>1.21.0"
+}
+
+terraform {
+  required_version = "~> 0.11.11"
+  backend "azurerm" {
+  }
+}
+
+resource "azurerm_resource_group" "rg_core" {
+  name = "rg-test-cblt-msft"
+  location = "eastus"
+}
+
+data "azurerm_client_config" "current" {}
+
+resource "azurerm_key_vault" "keyvault1" {
+  name                = "kv1-test-cblt-msft"
+  location            = "eastus"
+  resource_group_name = "rg-test-cblt-msft"
+  tenant_id           = "${data.azurerm_client_config.current.tenant_id}"
+  depends_on          = ["azurerm_resource_group.rg_core"]
+
+  sku {
+    name = "standard"
+  }
+}

tests/backend_test/test2/test2.tf

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+provider "azurerm" {
+    version = "~>1.21.0"
+}
+
+terraform {
+  required_version = "~> 0.11.11"
+  backend "azurerm" {
+  }
+}
+
+resource "azurerm_resource_group" "rg_core" {
+  name = "rg-test-cblt-msft"
+  location = "eastus"
+}
+
+data "azurerm_client_config" "current" {}
+
+resource "azurerm_key_vault" "keyvault1" {
+  name                = "kv1-test-cblt-msft"
+  location            = "eastus"
+  resource_group_name = "rg-test-cblt-msft"
+  tenant_id           = "${data.azurerm_client_config.current.tenant_id}"
+  depends_on          = ["azurerm_resource_group.rg_core"]
+
+  sku {
+    name = "standard"
+  }
+}
+
+resource "azurerm_key_vault" "keyvault2" {
+  name                = "kv2-test-cblt-msft"
+  location            = "eastus"
+  resource_group_name = "rg-test-cblt-msft"
+  tenant_id           = "${data.azurerm_client_config.current.tenant_id}"
+  depends_on          = ["azurerm_resource_group.rg_core"]
+
+  sku {
+    name = "standard"
+  }
+}

tests/backend_test/test3/test3.tf

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+provider "azurerm" {
+    version = "~>1.21.0"
+}
+
+terraform {
+  required_version = "~> 0.11.11"
+  backend "azurerm" {
+  }
+}
+
+resource "azurerm_resource_group" "rg_core" {
+  name = "rg-test-cblt-msft"
+  location = "eastus"
+}
+
+data "azurerm_client_config" "current" {}
+
+resource "azurerm_key_vault" "keyvault1" {
+  name                = "kv1-test-cblt-msft"
+  location            = "eastus"
+  resource_group_name = "rg-test-cblt-msft"
+  tenant_id           = "${data.azurerm_client_config.current.tenant_id}"
+  depends_on          = ["azurerm_resource_group.rg_core"]
+
+  sku {
+    name = "standard"
+  }
+}
+
+resource "azurerm_key_vault" "keyvault2" {
+  name                = "kv2-test-cblt-msft"
+  location            = "eastus"
+  resource_group_name = "rg-test-cblt-msft"
+  tenant_id           = "${data.azurerm_client_config.current.tenant_id}"
+  depends_on          = ["azurerm_resource_group.rg_core"]
+
+  sku {
+    name = "standard"
+  }
+}

tests/backend_test/test_backend.tfvars

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+storage_account_name="storage-account-name"
+access_key="storage-account-access-key"
+container_name="storage-account-container"
+key="test-tfstate-key"