improve: extract price in dollars when it has a single digit only (for example, $1)

Author: php-coder

src/main/java/ru/mystamps/web/feature/series/importing/SeriesInfoExtractorServiceImpl.java

@@ -443,7 +443,7 @@ public SeriesExtractedInfo extract(String pageUrl, RawParsedDataDto data) {
 				candidate = StringUtils.replaceChars(candidate, ',', '.');
 			}
 			// "10$" -> "10"
-			if (candidate.endsWith("$") && candidate.length() > 2) {
+			if (candidate.endsWith("$") && candidate.length() >= 2) {
 				candidate = candidate.substring(0, candidate.length() - 1);
 			}
 			try {

src/test/groovy/ru/mystamps/web/feature/series/importing/SeriesInfoExtractorServiceImplTest.groovy

@@ -652,6 +652,7 @@ class SeriesInfoExtractorServiceImplTest extends Specification {
 			service.extractPrice(fragment) == expected
 		where:
 			fragment        | expected
+			'1$'            | BigDecimal.ONE
 			'10$'           | BigDecimal.TEN
 			'10 EUR'        | BigDecimal.TEN
 			'10.0 EUR'      | BigDecimal.TEN