Send the invitation as a light letter that names the community, the inviter by email, and who can read the Rule.

tests/unit/ruleInviteCardMeta.test.ts

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+import { describe, expect, it } from "vitest";
+import {
+  clipCommunityInviteDescription,
+  communityInviteInitials,
+  communityPossessive,
+  inviteRuleCountsLabel,
+} from "../../lib/create/ruleInviteCardMeta";
+
+describe("communityInviteInitials", () => {
+  it("uses the first two words", () => {
+    expect(communityInviteInitials("Juniper Street Food Share")).toBe("JS");
+  });
+
+  it("uses two letters of a single word", () => {
+    expect(communityInviteInitials("Garden")).toBe("GA");
+  });
+});
+
+describe("communityPossessive", () => {
+  it("adds a curly ’s when the name does not end in s", () => {
+    expect(communityPossessive("Juniper Street Food Share")).toBe(
+      "Juniper Street Food Share’s",
+    );
+  });
+
+  it("adds only a curly apostrophe when the name ends in s", () => {
+    expect(communityPossessive("Members")).toBe("Members’");
+  });
+});
+
+describe("clipCommunityInviteDescription", () => {
+  it("cuts at 140 characters", () => {
+    const long = "a".repeat(160);
+    expect(clipCommunityInviteDescription(long)).toHaveLength(140);
+  });
+});
+
+describe("inviteRuleCountsLabel", () => {
+  it("counts values and other cards, not shared terms", () => {
+    expect(
+      inviteRuleCountsLabel({
+        sections: [
+          {
+            categoryName: "Values",
+            entries: [
+              { title: "Care", body: "We care." },
+              { title: "Share", body: "We share." },
+              { title: "Listen", body: "We listen." },
+            ],
+          },
+          {
+            categoryName: "Communication",
+            entries: [{ title: "Open channel", body: "We talk in the hall." }],
+          },
+          {
+            categoryName: "Membership",
+            entries: [{ title: "Open admission", body: "Anyone who shares the work." }],
+          },
+        ],
+      }),
+    ).toBe("3 VALUES AND 2 CARDS");
+  });
+});