Improve html builder generation code

src/main/groovy/org/grooscript/GenerateGrooscripTools.groovy

@@ -19,7 +19,11 @@ class JsGenerator {
 
     public static final HTML_BUILDER_SOURCE = 'src/main/groovy/org/grooscript/builder/HtmlBuilder.groovy'
 
-    static void generateGrooscriptHtmlBuilderJs(String pathSource, String pathJsDestination) {
+    public static void generateHtmlBuilder(String pathJsDestination) {
+        generateGrooscriptConvertedJs(HTML_BUILDER_SOURCE, pathJsDestination)
+    }
+
+    private static void generateGrooscriptConvertedJs(String pathSource, String pathJsDestination) {
         File source = new File(pathSource)
         convertFile(source, pathJsDestination)
         GsConsole.info("File $pathJsDestination has been generated.")
@@ -30,7 +34,4 @@ class JsGenerator {
     }
 }
 
-JsGenerator.generateGrooscriptHtmlBuilderJs(
-        JsGenerator.HTML_BUILDER_SOURCE,
-        'src/main/resources/META-INF/resources/grooscript-html-builder.js'
-)
+JsGenerator.generateHtmlBuilder('src/main/resources/META-INF/resources/grooscript-html-builder.js')

src/test/groovy/org/grooscript/JsGeneratorSpec.groovy

@@ -13,14 +13,30 @@
  */
 package org.grooscript
 
+import org.junit.Rule
+import org.junit.rules.TemporaryFolder
 import spock.lang.Specification
 
 class JsGeneratorSpec extends Specification {
-    def 'test generation of js files'() {
+
+    @Rule
+    TemporaryFolder folder = new TemporaryFolder()
+
+    def 'test generation of html builder js file'() {
+        given:
+        String destination = folder.newFile('htmlbuilder.js').getPath()
+
         expect:
-        JsGenerator.generateGrooscriptHtmlBuilderJs(
-                'src/main/groovy/org/grooscript/builder/HtmlBuilder.groovy',
-                'src/main/resources/META-INF/resources/grooscript-html-builder.js'
-        )
+        sizeOfDestinationFile(destination) == 0
+
+        when:
+        JsGenerator.generateHtmlBuilder(destination)
+
+        then:
+        sizeOfDestinationFile(destination) > 100
+    }
+
+    private int sizeOfDestinationFile(String destination) {
+        new File(destination).text.size()
     }
 }