add templates tests

Signed-off-by: Mohammed Al Sahaf <msaa1990@gmail.com>

caddytest/spec/http/templates/spec.hurl

@@ -0,0 +1,168 @@
+# Configure Caddy with templates directive
+POST http://localhost:2019/load
+Content-Type: text/caddyfile
+```
+{
+	skip_install_trust
+	http_port     9080
+	https_port    9443
+	local_certs
+}
+localhost {
+	templates
+	respond "Request path: \{\{.OriginalReq.URL.Path}}"
+}
+```
+
+# templates processes template syntax
+GET https://localhost:9443/test/path
+[Options]
+insecure: true
+HTTP 200
+[Asserts]
+body == "Request path: /test/path"
+
+
+# Configure Caddy with templates and file_server
+POST http://localhost:2019/load
+Content-Type: text/caddyfile
+```
+{
+	skip_install_trust
+	http_port     9080
+	https_port    9443
+	local_certs
+}
+localhost {
+	root * {{indexed_root}}
+	templates
+	file_server
+}
+```
+
+# templates doesn't process non-template files
+GET https://localhost:9443/index.txt
+[Options]
+insecure: true
+HTTP 200
+[Asserts]
+body == "index.txt"
+
+
+# Configure Caddy with templates and placeholders
+POST http://localhost:2019/load
+Content-Type: text/caddyfile
+```
+{
+	skip_install_trust
+	http_port     9080
+	https_port    9443
+	local_certs
+}
+localhost {
+	templates
+	respond "Method: \{\{.Req.Method}}, Host: \{\{.Req.Host}}"
+}
+```
+
+# templates exposes request properties
+GET https://localhost:9443
+[Options]
+insecure: true
+HTTP 200
+[Asserts]
+body == "Method: GET, Host: localhost:9443"
+
+
+# POST method is accessible in templates
+POST https://localhost:9443
+[Options]
+insecure: true
+HTTP 200
+[Asserts]
+body == "Method: POST, Host: localhost:9443"
+
+
+# Configure Caddy with templates and functions
+POST http://localhost:2019/load
+Content-Type: text/caddyfile
+```
+{
+	skip_install_trust
+	http_port     9080
+	https_port    9443
+	local_certs
+}
+localhost {
+	templates
+	respond "\{\{upper \"hello world\"}}"
+}
+```
+
+# templates provides utility functions
+GET https://localhost:9443
+[Options]
+insecure: true
+HTTP 200
+[Asserts]
+body == "HELLO WORLD"
+
+
+# Configure Caddy with templates conditionals
+POST http://localhost:2019/load
+Content-Type: text/caddyfile
+```
+{
+	skip_install_trust
+	http_port     9080
+	https_port    9443
+	local_certs
+}
+localhost {
+	templates
+	respond "\{\{if eq .Req.Method \"GET\"}}GET method\{\{else}}Other method\{\{end}}"
+}
+```
+
+# templates supports conditionals
+GET https://localhost:9443
+[Options]
+insecure: true
+HTTP 200
+[Asserts]
+body == "GET method"
+
+
+# templates conditional for other methods
+POST https://localhost:9443
+[Options]
+insecure: true
+HTTP 200
+[Asserts]
+body == "Other method"
+
+
+# Configure Caddy with templates and environment variables
+POST http://localhost:2019/load
+Content-Type: text/caddyfile
+```
+{
+	skip_install_trust
+	http_port     9080
+	https_port    9443
+	local_certs
+}
+localhost {
+	templates
+	respond "Path: \{\{env \"PATH\"}}"
+}
+```
+
+# templates can access environment variables
+GET https://localhost:9443
+[Options]
+insecure: true
+HTTP 200
+[Asserts]
+body contains "Path:"
+body contains "/"