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diff --git a/tests/test_avatar.cpp b/tests/test_avatar.cpp
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+++ b/tests/test_avatar.cpp
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+/*
+ * qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <QTest>
+
+#include "avatar.h"
+
+class TestAvatar : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void twoWordNameTakesOneLetterFromEach();
+    void oneWordNameTakesItsFirstTwoLetters();
+    void bareAddressTakesLocalAndDomain();
+    void nothingUsableFallsBackToTheAccountLabel();
+    void initialsAreAlwaysTwoLetters();
+};
+
+void TestAvatar::twoWordNameTakesOneLetterFromEach()
+{
+    QCOMPARE(Avatar::initialsFor(QStringLiteral("John Doe"),
+                                 QStringLiteral("john@example.org"),
+                                 QStringLiteral("Work")),
+             QStringLiteral("JD"));
+    // Three words still take the FIRST two, not the first and last.
+    QCOMPARE(Avatar::initialsFor(QStringLiteral("Maria Grazia Rossi"),
+                                 QStringLiteral("maria@example.org"),
+                                 QStringLiteral("Work")),
+             QStringLiteral("MG"));
+}
+
+void TestAvatar::oneWordNameTakesItsFirstTwoLetters()
+{
+    QCOMPARE(Avatar::initialsFor(QStringLiteral("Cofidis"),
+                                 QStringLiteral("noreply@cofidis.it"),
+                                 QStringLiteral("Work")),
+             QStringLiteral("CO"));
+}
+
+void TestAvatar::bareAddressTakesLocalAndDomain()
+{
+    QCOMPARE(Avatar::initialsFor(QString(),
+                                 QStringLiteral("noreply@cofidis.it"),
+                                 QStringLiteral("Work")),
+             QStringLiteral("NC"));
+}
+
+void TestAvatar::nothingUsableFallsBackToTheAccountLabel()
+{
+    // No name and no address at all: the account's label is the last resort,
+    // so a card always carries a squircle rather than a hole.
+    QCOMPARE(Avatar::initialsFor(QString(), QString(),
+                                 QStringLiteral("Work")),
+             QStringLiteral("WO"));
+    // And with nothing whatsoever, still two characters rather than empty.
+    QCOMPARE(Avatar::initialsFor(QString(), QString(), QString()).size(), 2);
+}
+
+void TestAvatar::initialsAreAlwaysTwoLetters()
+{
+    // The shape is the point: every squircle reads the same. An address with
+    // no domain, a one-letter local part and a name of one letter all still
+    // produce two characters.
+    const QStringList names { QString(), QStringLiteral("X"),
+                              QStringLiteral("A B") };
+    const QStringList addresses { QStringLiteral("a@b.org"),
+                                  QStringLiteral("malformed"),
+                                  QString() };
+    for (const QString &name : names) {
+        for (const QString &address : addresses) {
+            const QString initials =
+                Avatar::initialsFor(name, address, QStringLiteral("Acct"));
+            QCOMPARE(initials.size(), 2);
+        }
+    }
+}
+
+QTEST_MAIN(TestAvatar)
+#include "test_avatar.moc"