Changes:

- First draft of test coverage improvement for storybooks
- code's page html rendering issue fixed

stories/login/pages/Register.stories.tsx

@@ -185,3 +185,65 @@ export const WithTermsAcceptance: Story = {
         />
     )
 };
+export const WithTermsNotAccepted: Story = {
+    render: args => (
+        <KcPageStory
+            {...args}
+            kcContext={{
+                termsAcceptanceRequired: true,
+                messagesPerField: {
+                    existsError: (fieldName: string) => fieldName === "termsAccepted",
+                    get: (fieldName: string) => (fieldName === "termsAccepted" ? "You must accept the terms." : undefined)
+                }
+            }}
+        />
+    )
+};
+export const WithFieldErrors: Story = {
+    render: () => (
+        <KcPageStory
+            kcContext={{
+                profile: {
+                    attributesByName: {
+                        username: { value: "" },
+                        email: { value: "invalid-email" }
+                    }
+                },
+                messagesPerField: {
+                    existsError: fieldName => ["username", "email"].includes(fieldName),
+                    get: fieldName => {
+                        if (fieldName === "username") return "Username is required.";
+                        if (fieldName === "email") return "Invalid email format.";
+                    }
+                }
+            }}
+        />
+    )
+};
+export const WithReadOnlyFields: Story = {
+    render: () => (
+        <KcPageStory
+            kcContext={{
+                profile: {
+                    attributesByName: {
+                        username: { value: "johndoe", readOnly: true },
+                        email: { value: "jhon.doe@gmail.com", readOnly: false }
+                    }
+                }
+            }}
+        />
+    )
+};
+export const WithAutoGeneratedUsername: Story = {
+    render: () => (
+        <KcPageStory
+            kcContext={{
+                profile: {
+                    attributesByName: {
+                        username: { value: "autogenerated_username" }
+                    }
+                }
+            }}
+        />
+    )
+};