feat: Allow long passport variables

- This doesn't need to be resticted as it's handled at runtime

editor.planx.uk/src/@planx/components/Pay/model.test.ts

@@ -57,7 +57,7 @@ describe("GovPayMetadata Schema", () => {
     expect(errors[0]).toMatch(/Value is a required field/);
   });
 
-  test("value cannot be greater than 100 characters", async () => {
+  test("static values cannot be greater than 100 characters", async () => {
     const input = [
       ...defaults,
       {
@@ -71,6 +71,21 @@ describe("GovPayMetadata Schema", () => {
     expect(errors[0]).toMatch(/Value length cannot exceed 100 characters/);
   });
 
+  test("dynamic passport value can be greater than 100 characters", async () => {
+    const input = [
+      ...defaults,
+      {
+        key: "myPassportVariable",
+        value:
+          "@thisIsAVeryLongPassportVariable.itsUnlikelyToHappenButWeDontNeedToRestrict.theDynamicValueThisReadsWillBeTruncatedAtTimeOfSubmission",
+      },
+    ];
+    const result = await validate(input);
+
+    // No errors, input returned from validation
+    expect(result).toEqual(input);
+  });
+
   test("keys must be unique", async () => {
     const input = [
       ...defaults,

editor.planx.uk/src/@planx/components/Pay/model.ts

@@ -89,7 +89,17 @@ export const govPayMetadataSchema = array(
       .max(30, "Key length cannot exceed 30 characters"),
     value: string()
       .required("Value is a required field")
-      .max(100, "Value length cannot exceed 100 characters"),
+      .test({
+        name: "max-length",
+        message: "Value length cannot exceed 100 characters",
+        test: (value) => {
+          if (!value) return true;
+          // No limit to dynamic passport variable length, this is checked and truncated at runtime
+          if (value.startsWith("@")) return true;
+          // Static strings must be 100 characters or less
+          return value.length <= 100;
+        },
+      }),
   }),
 )
   .max(10, "A maximum of 10 fields can be set as metadata")