Compose: Show 'search for username' by itself more often

ts/test-electron/util/Username_test.ts

@@ -9,12 +9,9 @@ describe('Username', () => {
   describe('getUsernameFromSearch', () => {
     const { getUsernameFromSearch } = Username;
 
-    it('matches invalid username searches', () => {
-      assert.isUndefined(getUsernameFromSearch('us'));
-      assert.isUndefined(getUsernameFromSearch('123'));
-    });
-
     it('matches partial username searches without discriminator', () => {
+      assert.strictEqual(getUsernameFromSearch('u'), 'u.01');
+      assert.strictEqual(getUsernameFromSearch('us'), 'us.01');
       assert.strictEqual(getUsernameFromSearch('use'), 'use.01');
       assert.strictEqual(getUsernameFromSearch('use.'), 'use.01');
     });
@@ -25,6 +22,11 @@ describe('Username', () => {
       assert.strictEqual(getUsernameFromSearch('@user.01'), 'user.01');
     });
 
+    it('adds a 1 if discriminator is one digit', () => {
+      assert.strictEqual(getUsernameFromSearch('@user.0'), 'user.01');
+      assert.strictEqual(getUsernameFromSearch('@user.2'), 'user.21');
+    });
+
     it('matches valid username searches', () => {
       assert.strictEqual(getUsernameFromSearch('username.12'), 'username.12');
       assert.strictEqual(getUsernameFromSearch('xyz.568'), 'xyz.568');
@@ -37,4 +39,39 @@ describe('Username', () => {
       assert.isUndefined(getUsernameFromSearch('+234234234233'));
     });
   });
+
+  describe('probablyAUsername', () => {
+    const { isProbablyAUsername: probablyAUsername } = Username;
+
+    it('returns true if it starts with @', () => {
+      assert.isTrue(probablyAUsername('@'));
+      assert.isTrue(probablyAUsername('@5551115555'));
+      assert.isTrue(probablyAUsername('@.324'));
+    });
+
+    it('returns true if it ends with a discriminator', () => {
+      assert.isTrue(probablyAUsername('someone.00'));
+      assert.isTrue(probablyAUsername('32423423.04'));
+      assert.isTrue(probablyAUsername('d.04'));
+    });
+
+    it('returns false if just a discriminator', () => {
+      assert.isFalse(probablyAUsername('.01'));
+      assert.isFalse(probablyAUsername('.99'));
+    });
+
+    it('returns false for normal searches', () => {
+      assert.isFalse(probablyAUsername('group'));
+      assert.isFalse(probablyAUsername('climbers'));
+      assert.isFalse(probablyAUsername('sarah'));
+      assert.isFalse(probablyAUsername('john'));
+    });
+
+    it('returns false for something that looks like a phone number', () => {
+      assert.isFalse(probablyAUsername('+'));
+      assert.isFalse(probablyAUsername('2223'));
+      assert.isFalse(probablyAUsername('+3'));
+      assert.isFalse(probablyAUsername('+234234234233'));
+    });
+  });
 });