Improve error messages

Author: larsgrefer

sass-embedded-host/src/main/java/de/larsgrefer/sass/embedded/connection/BundledPackageProvider.java

@@ -15,7 +15,13 @@ protected URL getPackageUrl() {
 
         String resourcePath = String.format("/de/larsgrefer/sass/embedded/bundled/dart-sass-%s", dartSassPackageSuffix);
 
-        return this.getClass().getResource(resourcePath);
+        URL bundledResource = this.getClass().getResource(resourcePath);
+
+        if (bundledResource == null) {
+            throw new IllegalStateException("Could not find resource: " + resourcePath);
+        }
+
+        return bundledResource;
     }
 
 

sass-embedded-host/src/main/java/de/larsgrefer/sass/embedded/connection/ConnectionFactory.java

@@ -55,7 +55,11 @@ public static ProcessConnection fromPackageProvider(DartSassPackageProvider dart
      * @throws IOException if the subprocess can not be started.
      */
     public static ProcessConnection ofExecutable(File executable) throws IOException {
-        if (executable == null || !executable.isFile()) {
+        if (executable == null) {
+            throw new IllegalArgumentException("executable must not be null");
+        }
+
+        if (!executable.isFile()) {
             throw new IllegalArgumentException(executable + " is not a file");
         }