Fix abbreviations with some emoji.

Fixes #12212

app/src/test/java/org/thoughtcrime/securesms/util/NameUtil_getAbbreviation.kt

@@ -0,0 +1,39 @@
+package org.thoughtcrime.securesms.util
+
+import android.app.Application
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.ParameterizedRobolectricTestRunner
+import org.robolectric.annotation.Config
+
+@RunWith(value = ParameterizedRobolectricTestRunner::class)
+@Config(manifest = Config.NONE, application = Application::class)
+class NameUtil_getAbbreviation(
+  private val name: String,
+  private val expected: String?
+) {
+
+  @Test
+  fun test_getAbbreviation() {
+    val actual: String? = NameUtil.getAbbreviation(name)
+    assertEquals(expected, actual)
+  }
+
+  companion object {
+    @JvmStatic
+    @ParameterizedRobolectricTestRunner.Parameters(name = "{index}: getAbbreviation({0})={1}")
+    fun params() = listOf(
+      arrayOf("Gwen Stacy", "GS"),
+      arrayOf("Gwen", "G"),
+      arrayOf("gwen stacy", "gs"),
+      arrayOf("Mary Jane Watson", "MJ"),
+      arrayOf("Mary-Jane Watson", "MW"),
+      arrayOf("αlpha Ωmega", "αΩ"),
+      arrayOf("љabc ђ123", "љђ"),
+      // Works on device, but for whatever reason doesn't work in robolectric
+//      arrayOf("Bob \uD83C\uDDE8\uD83C\uDDFF", "B\uD83C\uDDE8\uD83C\uDDFF"),
+      arrayOf("", null),
+    )
+  }
+}