Bug 1858193: Add a test for parsing font files

fenix/app/src/androidTest/assets/resources/TestTT_-LICENSE

@@ -0,0 +1,23 @@
+From: https://raw.githubusercontent.com/fonttools/fonttools/main/LICENSE
+
+MIT License
+
+Copyright (c) 2017 Just van Rossum
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

fenix/app/src/androidTest/java/org/mozilla/fenix/components/FontParserTest.kt

@@ -0,0 +1,79 @@
+package org.mozilla.fenix.components
+
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.mozilla.fenix.components.metrics.fonts.FontEnumerationWorker
+import org.mozilla.fenix.components.metrics.fonts.FontParser
+
+class FontParserTest {
+    @Test
+    fun testSanityAssertion() {
+        /*
+         Changing the below constant causes _all_ Nightly users to send a (large) Telemetry event containing
+         their font information. Do not change this value unless you explicitly intend this.
+         */
+        assertEquals(1, FontEnumerationWorker.kDesiredSubmissions)
+    }
+
+    @Test
+    fun testFontParsing() {
+        val assetManager = InstrumentationRegistry.getInstrumentation().context.assets
+        val font1 = FontParser.parse("no-path", assetManager.open("resources/TestTTF.ttf"))
+        assertEquals(
+            "\u0000T\u0000e\u0000s\u0000t\u0000 \u0000T" +
+                "\u0000T\u0000F",
+            font1.family,
+        )
+        assertEquals(
+            "\u0000V\u0000e\u0000r\u0000s\u0000i\u0000o\u0000n\u0000 \u00001\u0000." +
+                "\u00000\u00000\u00000",
+            font1.fontVersion,
+        )
+        assertEquals(
+            "\u0000T\u0000e\u0000s\u0000t\u0000 \u0000T\u0000T\u0000F",
+            font1.fullName,
+        )
+        assertEquals("\u0000R\u0000e\u0000g\u0000u\u0000l\u0000a\u0000r", font1.subFamily)
+        assertEquals(
+            "\u0000F\u0000o\u0000n\u0000t\u0000T\u0000o\u0000o\u0000l\u0000s\u0000:\u0000 " +
+                "\u0000T\u0000e\u0000s\u0000t\u0000 \u0000T\u0000T\u0000F\u0000:\u0000 \u00002\u00000\u00001\u00005",
+            font1.uniqueSubFamily,
+        )
+        assertEquals(
+            "C4E8CE309F44A131D061D73B2580E922A7F5ECC8D7109797AC0FF58BF8723B7B",
+            font1.hash,
+        )
+        assertEquals(3516272951, font1.created)
+        assertEquals(3573411749, font1.modified)
+        assertEquals(65536, font1.revision)
+        val font2 = FontParser.parse("no-path", assetManager.open("resources/TestTTC.ttc"))
+        assertEquals(
+            "\u0000T\u0000e\u0000s\u0000t\u0000 \u0000T" +
+                "\u0000T\u0000F",
+            font2.family,
+        )
+        assertEquals(
+            "\u0000V\u0000e\u0000r\u0000s\u0000i\u0000o\u0000n\u0000 \u00001\u0000." +
+                "\u00000\u00000\u00000",
+            font2.fontVersion,
+        )
+        assertEquals(
+            "\u0000T\u0000e\u0000s\u0000t\u0000 \u0000T\u0000T\u0000F",
+            font2.fullName,
+        )
+        assertEquals("\u0000R\u0000e\u0000g\u0000u\u0000l\u0000a\u0000r", font1.subFamily)
+        assertEquals(
+            "\u0000F\u0000o\u0000n\u0000t\u0000T\u0000o\u0000o\u0000l\u0000s\u0000:\u0000 " +
+                "\u0000T\u0000e\u0000s\u0000t\u0000 \u0000T\u0000T\u0000F\u0000:\u0000 \u00002\u00000\u00001\u00005",
+            font2.uniqueSubFamily,
+        )
+        assertEquals(
+            "A8521588045ED5F1F8B07EECAAC06ED3186C644655BFAC00DD4507CD316FBDC5",
+            font2.hash,
+        )
+        assertEquals(3516272951, font2.created)
+        assertEquals(3573411749, font2.modified)
+        assertEquals(65536, font2.revision)
+    }
+}