add test for reinitializing after reset PATH

src/test/groovy/sdkman/specs/InitialisationSpec.groovy

@@ -88,6 +88,74 @@ class InitialisationSpec extends Specification {
         missingCandidates.isEmpty()
     }
 
+    void "should reinitialize candidates in PATH if necessary"() {
+        given: 'a working sdkman installation with many candidates'
+        def allCandidates = [
+                "asciidoctorj",
+                "crash",
+                "gaiden",
+                "glide",
+                "gradle",
+                "grails",
+                "griffon",
+                "groovy",
+                "groovyserv",
+                "jbake",
+                "jbossforge",
+                "lazybones",
+                "springboot",
+                "vertx"
+        ]
+        bash = SdkManBashEnvBuilder
+                .create(sdkmanBaseDir)
+                .withAvailableCandidates(allCandidates)
+                .withCandidates(allCandidates)
+                .withCurlStub(curlStub)
+                .withVersionToken("x.y.z")
+                .build()
+
+        and:
+        allCandidates.forEach {
+            def current = Paths.get("$sdkmanDotDir/$it/current")
+            def targetFilename = "$sdkmanDotDir/$it/xxx"
+
+            new File(targetFilename).createNewFile()
+            def target = Paths.get(targetFilename)
+
+            Files.createSymbolicLink(current, target)
+        }
+
+        bash.start()
+        bash.execute("source $bootstrap")
+        bash.resetOutput()
+
+        when: 're-sourcing bootstrap after resetting PATH'
+        // reset path and re-init
+        def origPath = bash.env.grep { it =~ /^PATH=/ }
+        bash.execute(origPath)
+
+        bash.execute("source $bootstrap")
+        bash.execute('echo $PATH')
+
+        def pathParts = bash.output.split(':')
+        def pathElementMatcher = ~/$sdkmanDotDir\/([^\/]+)\/.*/
+        def includedCandidates = pathParts
+                .collect { it.replace("\n", "")}
+                .collect { it =~ pathElementMatcher }
+                .findAll { it }
+                .collect { it[0][1] }
+                .sort()
+
+        println("Available: $allCandidates")
+        println("Included : $includedCandidates")
+
+        and:
+        def missingCandidates = allCandidates - includedCandidates
+
+        then:
+        missingCandidates.isEmpty()
+    }
+
     void cleanup(){
         println bash.output
         bash.stop()