Ensure that unit tests can be run when WebEnvironment.NONE is used (#109)

Fixes #108

Author: geoand

opentracing-spring-web-starter/src/main/java/io/opentracing/contrib/spring/web/starter/SkipPatternAutoConfiguration.java

@@ -143,6 +143,9 @@ public SkipPattern skipPatternForActuatorEndpointsDifferentPort(
   @Configuration
   protected static class DefaultSkipPatternConfig {
 
+    @Autowired(required = false)
+    WebTracingProperties webTracingProperties;
+
     private static String combinedPatterns(String skipPattern) {
       String pattern = skipPattern;
       if (!StringUtils.hasText(skipPattern)) {
@@ -152,9 +155,12 @@ private static String combinedPatterns(String skipPattern) {
     }
 
     @Bean
-    SkipPattern defaultSkipPatternBean(WebTracingProperties webTracingProperties) {
+    SkipPattern defaultSkipPatternBean() {
+      if (webTracingProperties == null) {
+        return Optional::empty;
+      }
       return () -> Optional.of(Pattern.compile(combinedPatterns(webTracingProperties.getSkipPattern())));
     }
   }
 
-}
+}

opentracing-spring-web-starter/src/test/java/io/opentracing/contrib/spring/web/starter/SkipPatternConfigTest.java

@@ -43,8 +43,11 @@ public class SkipPatternConfigTest {
   public void testShouldPickSkipPatternFromWebProperties() {
     WebTracingProperties webTracingProperties = new WebTracingProperties();
     webTracingProperties.setSkipPattern("foo.*|bar.*");
-    Pattern pattern = new SkipPatternAutoConfiguration.DefaultSkipPatternConfig()
-        .defaultSkipPatternBean(webTracingProperties).pattern().get();
+    SkipPatternAutoConfiguration.DefaultSkipPatternConfig defaultSkipPatternConfig =
+            new SkipPatternAutoConfiguration.DefaultSkipPatternConfig();
+    defaultSkipPatternConfig.webTracingProperties = webTracingProperties;
+    Pattern pattern = defaultSkipPatternConfig
+        .defaultSkipPatternBean().pattern().get();
 
     then(pattern.pattern()).isEqualTo("foo.*|bar.*");
   }
@@ -195,4 +198,4 @@ public Collection<WebOperation> getOperations() {
       }
     };
   }
-}
+}