SeriesInfoExtractorServiceImplTest: add tests for an empty input.

Addressed to #686

Author: php-coder

src/test/groovy/ru/mystamps/web/service/SeriesInfoExtractorServiceImplTest.groovy

@@ -0,0 +1,76 @@
+/**
+ * Copyright (C) 2009-2017 Slava Semushin <slava.semushin@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+package ru.mystamps.web.service
+
+import static io.qala.datagen.RandomShortApi.nullOrBlank
+
+import org.slf4j.helpers.NOPLogger
+
+import spock.lang.Specification
+
+@SuppressWarnings(['ClassJavadoc', 'MethodName', 'NoDef', 'NoTabCharacter', 'TrailingWhitespace'])
+class SeriesInfoExtractorServiceImplTest extends Specification {
+	
+	private final CategoryService categoryService = Mock()
+	private final CountryService countryService = Mock()
+	private final SeriesInfoExtractorService service = new SeriesInfoExtractorServiceImpl(
+		NOPLogger.NOP_LOGGER,
+		categoryService,
+		countryService
+	)
+	
+	//
+	// Tests for extractCategory()
+	//
+	
+	def 'extractCategory() should return empty result when fragment is null, empty or blank'() {
+		given:
+			String fragment = nullOrBlank()
+		when:
+			List<Integer> result = service.extractCategory(fragment)
+		then:
+			result.isEmpty()
+	}
+	
+	//
+	// Tests for extractCountry()
+	//
+	
+	def 'extractCountry() should return empty result when fragment is null, empty or blank'() {
+		given:
+			String fragment = nullOrBlank()
+		when:
+			List<Integer> result = service.extractCountry(fragment)
+		then:
+			result.isEmpty()
+	}
+	
+	//
+	// Tests for extractReleaseYear()
+	//
+	
+	def 'extractReleaseYear() should return null when fragment is null, empty or blank'() {
+		given:
+			String fragment = nullOrBlank()
+		when:
+			Integer year = service.extractReleaseYear(fragment)
+		then:
+			year == null
+	}
+	
+}