diff --git a/packages/util-endpoints/src/__mocks__/test-cases/default-values.json b/packages/util-endpoints/src/__mocks__/test-cases/default-values.json
index 46630aba9cd..37ccd1c8115 100644
--- a/packages/util-endpoints/src/__mocks__/test-cases/default-values.json
+++ b/packages/util-endpoints/src/__mocks__/test-cases/default-values.json
@@ -1,43 +1,55 @@
 {
   "testCases": [
     {
-      "documentation": "default endpoint",
-      "params": {},
-      "expect": {
-        "endpoint": {
-          "url": "https://fips.us-west-5.amazonaws.com"
-        }
-      }
-    },
-    {
-      "documentation": "test case where FIPS is disabled",
+      "documentation": "Default value is used when parameter is unset",
       "params": {
-        "UseFips": false
+        "bar": "a b"
       },
+      "operationInputs": [
+        {
+          "operationName": "GetThing",
+          "builtInParams": {
+            "SDK::Endpoint": "https://custom.example.com"
+          },
+          "clientParams": {
+            "bar": "a b"
+          }
+        }
+      ],
       "expect": {
-        "error": "UseFips = false"
+        "endpoint": {
+          "url": "https://example.com/baz"
+        }
       }
     },
     {
-      "documentation": "test case where FIPS is enabled explicitly",
+      "documentation": "Default value is not used when the parameter is set",
       "params": {
-        "UseFips": true
+        "bar": "a b",
+        "baz": "BIG"
       },
+      "operationInputs": [
+        {
+          "operationName": "GetThing",
+          "builtInParams": {
+            "SDK::Endpoint": "https://custom.example.com"
+          },
+          "clientParams": {
+            "bar": "a b",
+            "baz": "BIG"
+          }
+        }
+      ],
       "expect": {
         "endpoint": {
-          "url": "https://fips.us-west-5.amazonaws.com"
+          "url": "https://example.com/BIG"
         }
       }
     },
     {
-      "documentation": "defaults can be overridden",
-      "params": {
-        "Region": "us-east-1"
-      },
+      "documentation": "a documentation string",
       "expect": {
-        "endpoint": {
-          "url": "https://fips.us-east-1.amazonaws.com"
-        }
+        "error": "endpoint error"
       }
     }
   ],
diff --git a/packages/util-endpoints/src/__mocks__/valid-rules/default-values.json b/packages/util-endpoints/src/__mocks__/valid-rules/default-values.json
index 42c95b43c1f..9657216f3f7 100644
--- a/packages/util-endpoints/src/__mocks__/valid-rules/default-values.json
+++ b/packages/util-endpoints/src/__mocks__/valid-rules/default-values.json
@@ -1,44 +1,46 @@
 {
+  "version": "1.0",
   "parameters": {
-    "Region": {
+    "bar": {
       "type": "string",
-      "builtIn": "AWS::Region",
-      "documentation": "The region to dispatch this request, eg. `us-east-1`.",
-      "default": "us-west-5",
-      "required": true
+      "documentation": "docs"
     },
-    "UseFips": {
-      "type": "boolean",
-      "builtIn": "AWS::UseFIPS",
-      "default": true,
-      "required": true
+    "baz": {
+      "type": "string",
+      "documentation": "docs",
+      "required": true,
+      "default": "baz"
+    },
+    "endpoint": {
+      "type": "string",
+      "builtIn": "SDK::Endpoint",
+      "required": true,
+      "default": "asdf",
+      "documentation": "docs"
     }
   },
   "rules": [
     {
-      "documentation": "Template the region into the URI when FIPS is enabled",
       "conditions": [
         {
-          "fn": "booleanEquals",
+          "fn": "isSet",
           "argv": [
             {
-              "ref": "UseFips"
-            },
-            true
+              "ref": "bar"
+            }
           ]
         }
       ],
       "endpoint": {
-        "url": "https://fips.{Region}.amazonaws.com"
+        "url": "https://example.com/{baz}"
       },
       "type": "endpoint"
     },
     {
-      "documentation": "error when fips is disabled",
       "conditions": [],
-      "error": "UseFips = false",
+      "documentation": "error fallthrough",
+      "error": "endpoint error",
       "type": "error"
     }
-  ],
-  "version": "1.3"
+  ]
 }