fix(tests): always and explicitly specify locale to toLowerCase() method.

See https://garygregory.wordpress.com/2015/11/03/java-lowercase-conversion-turkey/

Author: php-coder

src/test/groovy/ru/mystamps/web/feature/category/CategoryServiceImplTest.groovy

@@ -205,7 +205,7 @@ class CategoryServiceImplTest extends Specification {
 
 	def 'findIdsWhenNameStartsWith() should invoke dao, pass argument and return result from dao'() {
 		given:
-			String name = between(1, 10).english().toLowerCase()
+			String name = between(1, 10).english().toLowerCase(Locale.ENGLISH)
 			String expectedPattern = name + '%'
 		and:
 			List<Integer> expectedResult = Random.listOfIntegers()

src/test/groovy/ru/mystamps/web/feature/country/CountryServiceImplTest.groovy

@@ -204,7 +204,7 @@ class CountryServiceImplTest extends Specification {
 
 	def 'findIdsWhenNameStartsWith() should invoke dao, pass argument and return result from dao'() {
 		given:
-			String name = between(1, 10).english().toLowerCase()
+			String name = between(1, 10).english().toLowerCase(Locale.ENGLISH)
 			String expectedPattern = name + '%'
 		and:
 			List<Integer> expectedResult = Random.listOfIntegers()

src/test/groovy/ru/mystamps/web/feature/image/FilesystemImagePersistenceStrategyTest.groovy

@@ -66,7 +66,7 @@ class FilesystemImagePersistenceStrategyTest extends Specification {
 	@SuppressWarnings(['ClosureAsLastMethodParameter', 'UnnecessaryReturnKeyword'])
 	def 'save() should give a proper name to a file'() {
 		given:
-			String expectedExtension = imageInfoDto.type.toLowerCase()
+			String expectedExtension = imageInfoDto.type.toLowerCase(Locale.ENGLISH)
 			String expectedName = imageInfoDto.id
 			String expectedFileName = expectedName + '.' + expectedExtension
 		when:

src/test/java/ru/mystamps/web/feature/series/importing/extractor/JsoupSiteParserTest.java

@@ -25,6 +25,7 @@
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 import ru.mystamps.web.tests.Random;
+import java.util.Locale;
 
 import static io.qala.datagen.RandomShortApi.nullOr;
 import static io.qala.datagen.RandomShortApi.nullOrBlank;
@@ -66,8 +67,8 @@ public void parseShouldExtractSeriesInfo() {
 		String expectedIssueDate = Random.issueYear().toString();
 		String imageUrl = String.format(
 			"/%s-%s-%s.png",
-			expectedCountry.toLowerCase(),
-			expectedCategory.toLowerCase(),
+			expectedCountry.toLowerCase(Locale.ENGLISH),
+			expectedCategory.toLowerCase(Locale.ENGLISH),
 			expectedIssueDate
 		);
 		String expectedImageUrl = baseUri + imageUrl;
@@ -128,8 +129,8 @@ public void parseShouldExtractSeriesInfoFromFirstMatchedElements() {
 		String expectedIssueDate = Random.issueYear().toString();
 		String imageUrl = String.format(
 			"/%s-%s-%s.png",
-			expectedCountry.toLowerCase(),
-			expectedCategory.toLowerCase(),
+			expectedCountry.toLowerCase(Locale.ENGLISH),
+			expectedCategory.toLowerCase(Locale.ENGLISH),
 			expectedIssueDate
 		);
 		String sellerUrl = String.format("/seller/%d/info.htm", positiveInteger());