Add a test for textual durations parsing using TimeAgoParser's patterns

extractor/src/test/java/org/schabi/newpipe/extractor/localization/TimeAgoParserTest.java

@@ -0,0 +1,31 @@
+package org.schabi.newpipe.extractor.localization;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.schabi.newpipe.extractor.exceptions.ParsingException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class TimeAgoParserTest {
+    private static TimeAgoParser timeAgoParser;
+
+    @BeforeAll
+    static void setUp() {
+        timeAgoParser = TimeAgoPatternsManager.getTimeAgoParserFor(Localization.DEFAULT);
+    }
+
+    @Test
+    void testGetDuration() throws ParsingException {
+        assertEquals(1, timeAgoParser.parseDuration("one second"));
+        assertEquals(1, timeAgoParser.parseDuration("second"));
+        assertEquals(49, timeAgoParser.parseDuration("49 seconds"));
+        assertEquals(61, timeAgoParser.parseDuration("1 minute, 1 second"));
+    }
+
+    @Test
+    void testGetDurationError() {
+        assertThrows(ParsingException.class, () -> timeAgoParser.parseDuration("abcd"));
+        assertThrows(ParsingException.class, () -> timeAgoParser.parseDuration("12 abcd"));
+    }
+}