Consider powerlevels in comparator and add tests

Signed-off-by: RMidhunSuresh <rmidhunsuresh@gmail.com>

src/domain/session/rightpanel/comparator.js

@@ -0,0 +1,92 @@
+import {PowerLevels} from "../../../matrix/room/timeline/PowerLevels.js";
+
+export function createMemberComparator(powerLevels) {
+    return function comparator(member, otherMember) {
+        const p1 = powerLevels.getUserLevel(member.userId);
+        const p2 = powerLevels.getUserLevel(otherMember.userId);
+        if (p1 !== p2) { return p2 - p1; }
+        return member.displayName?.localeCompare(otherMember.displayName);
+    };
+}
+
+export function tests() {
+
+    function createComparatorWithPowerLevel(map) {
+        let users = {};
+        for (const prop in map) {
+            Object.assign(users, {[prop]: map[prop]});
+        }
+        const powerLevelEvent = {
+            content: {users, users_default: 0}
+        };
+        return createMemberComparator(new PowerLevels({powerLevelEvent}));
+    }
+
+    return {
+        "power_level(member1) > power_level(member2) returns value <= 0": assert => {
+            const fn = createComparatorWithPowerLevel({"@alice:hs.tld": 50});
+            const member1 = {userId: "@alice:hs.tld", displayName: "alice"};
+            const member2 = {userId: "@bob:hs.tld", displayName: "bob"};
+            assert.strictEqual(fn(member1, member2) <= 0, true);
+        },
+
+        "power_level(member1) < power_level(member2) returns value > 0": assert => {
+            const fn = createComparatorWithPowerLevel({"@alice:hs.tld": 50});
+            const member1 = {userId: "@bob:hs.tld", displayName: "bob"};
+            const member2 = {userId: "@alice:hs.tld", displayName: "alice"};
+            assert.strictEqual(fn(member1, member2) > 0, true);
+        },
+
+        "alphabetic compare on displayName": assert => {
+            const fn = createComparatorWithPowerLevel();
+            const member1 = {userId: "@bob:hs.tld", displayName: "bob"};
+            const member2 = {userId: "@alice:hs.tld", displayName: "alice"};
+            assert.strictEqual(fn(member1, member2) > 0, true);
+            assert.strictEqual(fn(member2, member1) <= 0, true);
+        },
+
+        "alphabetic compare with case (alice comes before Bob)": assert => {
+            const fn = createComparatorWithPowerLevel();
+            const member1 = {userId: "@bob:hs.tld", displayName: "Bob"};
+            const member2 = {userId: "@alice:hs.tld", displayName: "alice"};
+            assert.strictEqual(fn(member1, member2) > 0, true);
+            assert.strictEqual(fn(member2, member1) <= 0, true);
+        },
+
+        "equal powerlevel and same names returns 0": assert => {
+            const fn = createComparatorWithPowerLevel({"@bobby:hs.tld": 50, "@bob:hs.tld": 50});
+            const member1 = {userId: "@bob:hs.tld", displayName: "bob"};
+            const member2 = {userId: "@bobby:hs.tld", displayName: "bob"};
+            assert.strictEqual(fn(member1, member2), 0);
+            assert.strictEqual(fn(member2, member1), 0);
+        },
+
+        "(both_negative_powerlevel) power_level(member1) < power_level(member2) returns value > 0": assert => {
+            const fn = createComparatorWithPowerLevel({"@alice:hs.tld": -100, "@bob:hs.tld": -50});
+            const member1 = {userId: "@alice:hs.tld", displayName: "alice"};
+            const member2 = {userId: "@bob:hs.tld", displayName: "bob"};
+            assert.strictEqual(fn(member1, member2) > 0, true);
+        },
+
+        "(both_negative_powerlevel) power_level(member1) > power_level(member2) returns value <= 0": assert => {
+            const fn = createComparatorWithPowerLevel({"@alice:hs.tld": -50, "@bob:hs.tld": -100});
+            const member1 = {userId: "@alice:hs.tld", displayName: "alice"};
+            const member2 = {userId: "@bob:hs.tld", displayName: "bob"};
+            assert.strictEqual(fn(member1, member2) <= 0, true);
+        },
+
+        "(one_negative_powerlevel) power_level(member1) > power_level(member2) returns value <= 0": assert => {
+            const fn = createComparatorWithPowerLevel({"@alice:hs.tld": 50, "@bob:hs.tld": -100});
+            const member1 = {userId: "@alice:hs.tld", displayName: "alice"};
+            const member2 = {userId: "@bob:hs.tld", displayName: "bob"};
+            assert.strictEqual(fn(member1, member2) <= 0, true);
+        },
+
+        "(one_negative_powerlevel) power_level(member1) < power_level(member2) returns value > 0": assert => {
+            const fn = createComparatorWithPowerLevel({"@alice:hs.tld": -100, "@bob:hs.tld": 50});
+            const member1 = {userId: "@alice:hs.tld", displayName: "alice"};
+            const member2 = {userId: "@bob:hs.tld", displayName: "bob"};
+            assert.strictEqual(fn(member1, member2) > 0, true);
+        },
+    };
+}