Improve class coverage

src/test/groovy/net/fortuna/ical4j/util/DefaultEncoderFactoryTest.groovy

@@ -0,0 +1,40 @@
+package net.fortuna.ical4j.util
+
+import net.fortuna.ical4j.model.parameter.Encoding
+import org.apache.commons.codec.BinaryEncoder
+import org.apache.commons.codec.StringEncoder
+import spock.lang.Specification
+
+class DefaultEncoderFactoryTest extends Specification {
+
+    DefaultEncoderFactory factory = []
+
+    def "CreateBinaryEncoder"() {
+        expect: 'a binary encoder'
+        def encoder = factory.createBinaryEncoder(encoding)
+        encoder instanceof BinaryEncoder
+
+        where:
+        encoding << [Encoding.BASE64, Encoding.QUOTED_PRINTABLE]
+    }
+
+    def "CreateStringEncoder"() {
+        expect: 'a string encoder'
+        def encoder = factory.createStringEncoder(encoding)
+        encoder instanceof StringEncoder
+
+        where:
+        encoding << [Encoding.QUOTED_PRINTABLE]
+    }
+
+    def "assert invalid encoding"() {
+        given: 'an invalid string encoding'
+        def encoding = Encoding.BASE64
+
+        when: 'attempt to create encoder'
+        factory.createStringEncoder(encoding)
+
+        then: 'invalid encoding exception'
+        thrown(UnsupportedEncodingException)
+    }
+}

src/test/groovy/net/fortuna/ical4j/util/FixedUidGeneratorSpec.groovy

@@ -1,5 +1,6 @@
 package net.fortuna.ical4j.util
 
+import net.fortuna.ical4j.model.DateTime
 import spock.lang.Specification
 
 class FixedUidGeneratorSpec extends Specification {
@@ -15,4 +16,16 @@ class FixedUidGeneratorSpec extends Specification {
         then: 'HostInfo.getHostName() is only called once'
         1 * hostInfo.getHostName()
     }
+
+    def "verify generated uid"() {
+        given: 'a simple host info'
+        def hostInfo = new SimpleHostInfo('test')
+
+        when: 'a generator is created and a uid is generated multiple times'
+        FixedUidGenerator generator = [hostInfo, '1']
+        def uid = generator.generateUid()
+
+        then: 'uid is as expected'
+        uid.value == (new DateTime(utc: true) as String) + '-1@' + hostInfo.hostName
+    }
 }