RobotFramework: allow flaky tests to fail by marking them as non-critical.

Addressed to #540, #546, #556, #557

Author: php-coder

pom.xml

@@ -938,6 +938,10 @@
 						<!-- See also ru.mystamps.web.Url.SITE constant -->
 						<variable>SITE_URL:http://127.0.0.1:8080</variable>
 					</variables>
+					<nonCriticalTags>
+						<!-- Allow to tests with this tag to fail without changing final status -->
+						<nonCriticalTag>unstable</nonCriticalTag>
+					</nonCriticalTags>
 				</configuration>
 				<executions>
 					<execution>

src/test/robotframework/country/creation/logic.robot

@@ -9,6 +9,7 @@ Force Tags       country  logic
 *** Test Cases ***
 Create country with name in English
 	[Documentation]                   Verify creation of country by filling only mandatory fields
+	[Tags]                            unstable
 	Input Text                        id=name  Germany
 	Submit Form                       id=add-country-form
 	Location Should Be                ${SITE_URL}/country/germany

src/test/robotframework/series/creation/logic.robot

@@ -22,6 +22,7 @@ Create series by filling only required fields
 
 Create series by filling all fields
 	[Documentation]            Verify creation of series by filling all fields
+	[Tags]                     unstable
 	Select From List By Label  id=category  Sport
 	Select Country             Italy
 	Input Text                 id=quantity  3

src/test/robotframework/series/creation/misc.robot

@@ -9,6 +9,7 @@ Force Tags       series  misc
 *** Test Cases ***
 Catalog numbers should accept valid values
 	[Documentation]  Verify that fields with catalog numbers accept valid values
+	[Tags]           unstable
 	[Template]       Valid Catalog Numbers Should Be Accepted
 	7
 	7,8

src/test/robotframework/series/creation/validation.robot

@@ -32,6 +32,7 @@ Create series with empty image
 
 Catalog numbers should reject invalid values
 	[Documentation]  Verify that fields with catalog numbers reject invalid values
+	[Tags]           unstable
 	[Template]       Invalid Catalog Numbers Should Be Rejected
 	t
 	t,t