fix: address review feedback on format and param tests

Author: jarvis9443

t/conformance/test_format_validation.lua

@@ -1,6 +1,6 @@
 #!/usr/bin/env resty
 --- Conformance tests for format keyword validation.
--- Covers uuid, date, date-time, uri, email, ipv4, ipv6, hostname formats.
+-- Covers uuid, date, date-time, uri, email, ipv4, hostname formats.
 -- Each format has positive and negative cases.
 dofile("t/lib/test_bootstrap.lua")
 
@@ -44,9 +44,7 @@ end
 local function validate_format(format_name, value)
     local spec = make_format_spec(format_name)
     local v, err = ov.compile(spec)
-    if not v then
-        return nil, "compile failed: " .. tostring(err)
-    end
+    assert(v, "compile failed for format '" .. format_name .. "': " .. tostring(err))
     return v:validate_request({
         method = "POST",
         path = "/test",

t/conformance/test_param_serialization_matrix.lua

@@ -9,10 +9,11 @@ local ov   = require("resty.openapi_validator")
 
 
 local function make_spec(param_def, location)
+    local param = cjson.decode(cjson.encode(param_def))
     local path_template
     if location == "path" then
-        path_template = "/test/{" .. param_def.name .. "}"
-        param_def.required = true
+        path_template = "/test/{" .. param.name .. "}"
+        param.required = true
     else
         path_template = "/test"
     end
@@ -23,7 +24,7 @@ local function make_spec(param_def, location)
         paths = {
             [path_template] = {
                 get = {
-                    parameters = { param_def },
+                    parameters = { param },
                     responses = { ["200"] = { description = "OK" } },
                 },
             },