Added more tests

src/main/java/net/thauvin/erik/semver/VersionProcessor.java

@@ -34,7 +34,6 @@ package net.thauvin.erik.semver;
 
 import com.github.mustachejava.DefaultMustacheFactory;
 import com.github.mustachejava.Mustache;
-import com.github.mustachejava.MustacheFactory;
 import com.github.mustachejava.MustacheNotFoundException;
 
 import javax.annotation.processing.*;
@@ -79,6 +78,11 @@ public class VersionProcessor extends AbstractProcessor {
         return template;
     }
 
+    private Mustache compileTemplate(final File dir, final String template) {
+        final var mf = new DefaultMustacheFactory(dir);
+        return mf.compile(template);
+    }
+
     private void error(final String s) {
         log(Diagnostic.Kind.ERROR, s);
     }
@@ -232,9 +236,8 @@ public class VersionProcessor extends AbstractProcessor {
 
     private void writeTemplate(final String type, final VersionInfo versionInfo, final String template)
             throws IOException {
-        final File dir = getLocalFile("");
+        final var dir = getLocalFile("");
-        final MustacheFactory mf = new DefaultMustacheFactory(dir);
+        final var mustache = compileTemplate(dir, template);
-        final Mustache mustache = mf.compile(template);
 
         final String templateName = switch (mustache.getName()) {
             case Constants.DEFAULT_JAVA_TEMPLATE -> "default (Java)";
@@ -243,7 +246,7 @@ public class VersionProcessor extends AbstractProcessor {
         };
         note("Loaded template: " + templateName);
 
-        final String fileName = versionInfo.getClassName() + '.' + type;
+        final var fileName = versionInfo.getClassName() + '.' + type;
         if (Constants.KOTLIN_TYPE.equalsIgnoreCase(type)) {
             final String kaptGenDir = processingEnv.getOptions().get(Constants.KAPT_KOTLIN_GENERATED_OPTION_NAME);
             if (kaptGenDir == null) {

src/test/java/net/thauvin/erik/semver/VersionProcessorTest.java

@@ -32,13 +32,17 @@
 
 package net.thauvin.erik.semver;
 
+import com.github.mustachejava.Mustache;
 import org.junit.jupiter.api.Test;
 
+import java.io.File;
+import java.io.IOException;
+import java.io.StringWriter;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.Properties;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.*;
 
 /**
  * The <code>VersionProcessorTest</code> class.
@@ -49,7 +53,63 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
  */
 class VersionProcessorTest {
     private final VersionProcessor processor = new VersionProcessor();
-    private final Version version = new VersionTest();
+    private final VersionTest version = new VersionTest();
+
+    @SuppressWarnings("PMD.AvoidAccessibilityAlteration")
+    @Test
+    void testCompileTemplate()
+            throws NoSuchMethodException, InvocationTargetException, IllegalAccessException, IOException {
+        final var method = processor.getClass().getDeclaredMethod("compileTemplate", File.class, String.class);
+        method.setAccessible(true);
+
+        final var mustache = (Mustache) method.invoke(processor, new File("src/main/resources"),
+                Constants.DEFAULT_JAVA_TEMPLATE);
+
+        assertEquals(Constants.DEFAULT_JAVA_TEMPLATE, mustache.getName(), Constants.DEFAULT_JAVA_TEMPLATE);
+
+        try (var writer = new StringWriter()) {
+            mustache.execute(writer, version).flush();
+            assertEquals(String.format("""
+                                    /*
+                                    * This file is automatically generated.
+                                    * Do not modify! -- ALL CHANGES WILL BE ERASED!
+                                    */
+                                                        
+                                    package %s;
+                                                        
+                                    import java.util.Date;
+                                                        
+                                    /**
+                                    * Provides semantic version information.
+                                    *
+                                    * @author <a href="https://github.com/ethauvin/semver">Semantic Version Annotation Processor</a>
+                                    */
+                                    public final class MyTest {
+                                    public static final String PROJECT = "%s";
+                                    public static final Date BUILDDATE = new Date(L);
+                                    public static final int MAJOR = %d;
+                                    public static final int MINOR = %d;
+                                    public static final int PATCH = %d;
+                                    public static final String PRERELEASE = "%s";
+                                    public static final String PRERELEASE_PREFIX = "%s";
+                                    public static final String BUILDMETA = "%s";
+                                    public static final String BUILDMETA_PREFIX = "%s";
+                                    public static final String SEPARATOR = "%s";
+                                    public static final String VERSION = "";
+                                                        
+                                    /**
+                                    * Disables the default constructor.
+                                    */
+                                    private MyTest() {
+                                    throw new UnsupportedOperationException("Illegal constructor call.");
+                                    }
+                                    }
+                                    """, version.packageName(), version.project(), version.major(), version.minor(), version.patch(),
+                            version.preRelease(), version.preReleasePrefix(), version.buildMeta(),
+                            version.buildMetaPrefix(), version.separator()),
+                    writer.toString());
+        }
+    }
 
     @SuppressWarnings("PMD.AvoidAccessibilityAlteration")
     @Test
@@ -62,6 +122,20 @@ class VersionProcessorTest {
         assertEquals("James Bond", versionInfo.getProject(), "getProject(James Bond)");
     }
 
+    @SuppressWarnings("PMD.AvoidAccessibilityAlteration")
+    @Test
+    void testGetTemplate() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
+        final Method method = processor.getClass().getDeclaredMethod("getTemplate", boolean.class, Version.class);
+        method.setAccessible(true);
+
+        assertEquals(version.template(), method.invoke(processor, true, version), version.template);
+        version.setTemplate(Constants.DEFAULT_JAVA_TEMPLATE);
+        assertEquals(Constants.DEFAULT_TEMPLATE_NAME, method.invoke(processor, true, version),
+                "default");
+        assertEquals(Constants.DEFAULT_KOTLIN_TEMPLATE, method.invoke(processor, false, version),
+                "kotlin");
+    }
+
     @SuppressWarnings("PMD.AvoidAccessibilityAlteration")
     @Test
     void testParseIntProperty() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {

src/test/java/net/thauvin/erik/semver/VersionTest.java

@@ -43,6 +43,8 @@ import java.lang.annotation.Annotation;
  */
 @SuppressWarnings({"ClassExplicitlyAnnotation", "SameReturnValue", "java:S2187", "PMD.TestClassWithoutTestCases"})
 class VersionTest implements Version {
+    String template = "myversion.mustache";
+
     @Override
     public Class<? extends Annotation> annotationType() {
         return null;
@@ -160,11 +162,15 @@ class VersionTest implements Version {
 
     @Override
     public String template() {
-        return "myversion.mustache";
+        return template;
     }
 
     @Override
     public String type() {
         return "kt";
     }
+
+    public void setTemplate(final String template) {
+        this.template = template;
+    }
 }