diff --git a/pgpainless-core/src/test/java/org/pgpainless/key/parsing/KeyRingReaderTest.java b/pgpainless-core/src/test/java/org/pgpainless/key/parsing/KeyRingReaderTest.java
index 9349a864..b3fe66d4 100644
--- a/pgpainless-core/src/test/java/org/pgpainless/key/parsing/KeyRingReaderTest.java
+++ b/pgpainless-core/src/test/java/org/pgpainless/key/parsing/KeyRingReaderTest.java
@@ -14,6 +14,7 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
@@ -50,11 +51,38 @@ class KeyRingReaderTest {
     private InputStream requireResource(String resourceName) {
         InputStream inputStream = getClass().getClassLoader().getResourceAsStream(resourceName);
         if (inputStream == null) {
-            throw new TestAbortedException("Cannot read resource " + resourceName);
+            throw new TestAbortedException("Cannot read resource " + resourceName + ": InputStream is null.");
         }
         return inputStream;
     }
 
+    private URI getResourceURI(String resourceName) {
+        try {
+            URL url = getClass().getClassLoader().getResource(resourceName);
+            if (url == null) {
+                throw new TestAbortedException("Cannot read resource " + resourceName + ": URL is null.");
+            }
+            return url.toURI();
+        } catch (URISyntaxException | IllegalArgumentException e) {
+            throw new TestAbortedException("Cannot read resource " + resourceName, e);
+        }
+    }
+
+    private File getFileFromResource(String resourceName) {
+        URI uri = getResourceURI(resourceName);
+        try {
+            return new File(uri);
+        } catch (IllegalArgumentException e) {
+            // When executing the tests from pgpainless-test.jar, we cannot read resources as
+            //  URI is not hierarchical.
+            throw new TestAbortedException("Cannot read resource " + resourceName, e);
+        }
+    }
+
+    private byte[] readFromResource(String resourceName) throws IOException {
+        return Files.readAllBytes(getFileFromResource(resourceName).toPath());
+    }
+
     @Test
     public void assertThatPGPUtilsDetectAsciiArmoredData() throws IOException, PGPException {
         InputStream inputStream = requireResource("pub_keys_10_pieces.asc");
@@ -93,18 +121,16 @@ class KeyRingReaderTest {
     }
 
     @Test
-    void publicKeyRingCollectionFromString() throws IOException, PGPException, URISyntaxException {
-        URL resource = getClass().getClassLoader().getResource("pub_keys_10_pieces.asc");
-        String armoredString = new String(Files.readAllBytes(new File(resource.toURI()).toPath()));
+    void publicKeyRingCollectionFromString() throws IOException, PGPException {
+        String armoredString = new String(readFromResource("pub_keys_10_pieces.asc"));
         InputStream inputStream = new ByteArrayInputStream(armoredString.getBytes(StandardCharsets.UTF_8));
         PGPPublicKeyRingCollection rings = PGPainless.readKeyRing().publicKeyRingCollection(inputStream);
         assertEquals(10, rings.size());
     }
 
     @Test
-    void publicKeyRingCollectionFromBytes() throws IOException, PGPException, URISyntaxException {
-        URL resource = getClass().getClassLoader().getResource("pub_keys_10_pieces.asc");
-        byte[] bytes = Files.readAllBytes(new File(resource.toURI()).toPath());
+    void publicKeyRingCollectionFromBytes() throws IOException, PGPException {
+        byte[] bytes = readFromResource("pub_keys_10_pieces.asc");
         InputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
         PGPPublicKeyRingCollection rings = PGPainless.readKeyRing().publicKeyRingCollection(byteArrayInputStream);
         assertEquals(10, rings.size());
@@ -114,7 +140,7 @@ class KeyRingReaderTest {
      * One armored pub key
      */
     @Test
-    void parsePublicKeysSingleArmored() throws IOException, PGPException, URISyntaxException {
+    void parsePublicKeysSingleArmored() throws IOException, PGPException {
         assertEquals(1, getPgpPublicKeyRingsFromResource("single_pub_key_armored.asc").size());
     }
 
@@ -122,7 +148,7 @@ class KeyRingReaderTest {
      * One binary pub key
      */
     @Test
-    void parsePublicKeysSingleBinary() throws IOException, PGPException, URISyntaxException {
+    void parsePublicKeysSingleBinary() throws IOException, PGPException {
         assertEquals(1, getPgpPublicKeyRingsFromResource("single_pub_key_binary.key").size());
     }
 
@@ -130,7 +156,7 @@ class KeyRingReaderTest {
      * Many armored pub keys with a single -----BEGIN PGP PUBLIC KEY BLOCK-----...-----END PGP PUBLIC KEY BLOCK-----
      */
     @Test
-    void parsePublicKeysMultiplyArmoredSingleHeader() throws IOException, PGPException, URISyntaxException {
+    void parsePublicKeysMultiplyArmoredSingleHeader() throws IOException, PGPException {
         assertEquals(10, getPgpPublicKeyRingsFromResource("10_pub_keys_armored_single_header.asc").size());
     }
 
@@ -138,7 +164,7 @@ class KeyRingReaderTest {
      * Many armored pub keys where each has own -----BEGIN PGP PUBLIC KEY BLOCK-----...-----END PGP PUBLIC KEY BLOCK-----
      */
     @Test
-    void parsePublicKeysMultiplyArmoredOwnHeader() throws IOException, PGPException, URISyntaxException {
+    void parsePublicKeysMultiplyArmoredOwnHeader() throws IOException, PGPException {
         assertEquals(10, getPgpPublicKeyRingsFromResource("10_pub_keys_armored_own_header.asc").size());
     }
 
@@ -147,7 +173,7 @@ class KeyRingReaderTest {
      * Each of those blocks can have a different count of keys.
      */
     @Test
-    void parsePublicKeysMultiplyArmoredOwnWithSingleHeader() throws IOException, PGPException, URISyntaxException {
+    void parsePublicKeysMultiplyArmoredOwnWithSingleHeader() throws IOException, PGPException {
         assertEquals(10, getPgpPublicKeyRingsFromResource("10_pub_keys_armored_own_with_single_header.asc").size());
     }
 
@@ -155,7 +181,7 @@ class KeyRingReaderTest {
      * Many binary pub keys
      */
     @Test
-    void parsePublicKeysMultiplyBinary() throws IOException, PGPException, URISyntaxException {
+    void parsePublicKeysMultiplyBinary() throws IOException, PGPException {
         assertEquals(10, getPgpPublicKeyRingsFromResource("10_pub_keys_binary.key").size());
     }
 
@@ -163,7 +189,7 @@ class KeyRingReaderTest {
      * One armored private key
      */
     @Test
-    void parseSecretKeysSingleArmored() throws IOException, PGPException, URISyntaxException {
+    void parseSecretKeysSingleArmored() throws IOException, PGPException {
         assertEquals(1, getPgpSecretKeyRingsFromResource("single_prv_key_armored.asc").size());
     }
 
@@ -171,7 +197,7 @@ class KeyRingReaderTest {
      * One binary private key
      */
     @Test
-    void parseSecretKeysSingleBinary() throws IOException, PGPException, URISyntaxException {
+    void parseSecretKeysSingleBinary() throws IOException, PGPException {
         assertEquals(1, getPgpSecretKeyRingsFromResource("single_prv_key_binary.key").size());
     }
 
@@ -180,7 +206,7 @@ class KeyRingReaderTest {
      * -----BEGIN PGP PRIVATE KEY BLOCK-----...-----END PGP PRIVATE KEY BLOCK-----
      */
     @Test
-    void parseSecretKeysMultiplyArmoredSingleHeader() throws IOException, PGPException, URISyntaxException {
+    void parseSecretKeysMultiplyArmoredSingleHeader() throws IOException, PGPException {
         assertEquals(10, getPgpSecretKeyRingsFromResource("10_prv_keys_armored_single_header.asc").size());
     }
 
@@ -188,7 +214,7 @@ class KeyRingReaderTest {
      * Many armored private keys where each has own -----BEGIN PGP PRIVATE KEY BLOCK-----...-----END PGP PRIVATE KEY BLOCK-----
      */
     @Test
-    void parseSecretKeysMultiplyArmoredOwnHeader() throws IOException, PGPException, URISyntaxException {
+    void parseSecretKeysMultiplyArmoredOwnHeader() throws IOException, PGPException {
         assertEquals(10, getPgpSecretKeyRingsFromResource("10_prv_keys_armored_own_header.asc").size());
     }
 
@@ -197,7 +223,7 @@ class KeyRingReaderTest {
      * Each of those blocks can have a different count of keys.
      */
     @Test
-    void parseSecretKeysMultiplyArmoredOwnWithSingleHeader() throws IOException, PGPException, URISyntaxException {
+    void parseSecretKeysMultiplyArmoredOwnWithSingleHeader() throws IOException, PGPException {
         assertEquals(10, getPgpSecretKeyRingsFromResource("10_prv_keys_armored_own_with_single_header.asc").size());
     }
 
@@ -205,7 +231,7 @@ class KeyRingReaderTest {
      * Many binary private keys
      */
     @Test
-    void parseSecretKeysMultiplyBinary() throws IOException, PGPException, URISyntaxException {
+    void parseSecretKeysMultiplyBinary() throws IOException, PGPException {
         assertEquals(10, getPgpSecretKeyRingsFromResource("10_prv_keys_binary.key").size());
     }
 
@@ -213,7 +239,7 @@ class KeyRingReaderTest {
      * Many armored keys(private or pub) where each has own -----BEGIN PGP ... KEY BLOCK-----...-----END PGP ... KEY BLOCK-----
      */
     @Test
-    void parseKeysMultiplyArmoredOwnHeader() throws IOException, PGPException, URISyntaxException {
+    void parseKeysMultiplyArmoredOwnHeader() throws IOException, PGPException {
         assertEquals(10, getPGPKeyRingsFromResource("10_prv_and_pub_keys_armored_own_header.asc").size());
     }
 
@@ -222,7 +248,7 @@ class KeyRingReaderTest {
      * Each of those blocks can have a different count of keys.
      */
     @Test
-    void parseKeysMultiplyArmoredOwnWithSingleHeader() throws IOException, PGPException, URISyntaxException {
+    void parseKeysMultiplyArmoredOwnWithSingleHeader() throws IOException, PGPException {
         assertEquals(10, getPGPKeyRingsFromResource("10_prv_and_pub_keys_armored_own_with_single_header.asc").size());
     }
 
@@ -230,28 +256,26 @@ class KeyRingReaderTest {
      * Many binary keys(private or pub)
      */
     @Test
-    void parseKeysMultiplyBinary() throws IOException, PGPException, URISyntaxException {
+    void parseKeysMultiplyBinary() throws IOException, PGPException {
         assertEquals(10, getPGPKeyRingsFromResource("10_prv_and_pub_keys_binary.key").size());
     }
 
-    private InputStream getFileInputStreamFromResource(String fileName) throws IOException, URISyntaxException {
-        URL resource = getClass().getClassLoader().getResource(fileName);
-        assert resource != null;
-        return new FileInputStream(new File(resource.toURI()));
+    private InputStream getFileInputStreamFromResource(String fileName) throws IOException {
+        return new FileInputStream(getFileFromResource(fileName));
     }
 
     private PGPKeyRingCollection getPGPKeyRingsFromResource(String fileName)
-            throws IOException, URISyntaxException, PGPException {
+            throws IOException, PGPException {
         return PGPainless.readKeyRing().keyRingCollection(getFileInputStreamFromResource(fileName), true);
     }
 
     private PGPPublicKeyRingCollection getPgpPublicKeyRingsFromResource(String fileName)
-            throws IOException, URISyntaxException, PGPException {
+            throws IOException, PGPException {
         return PGPainless.readKeyRing().publicKeyRingCollection(getFileInputStreamFromResource(fileName));
     }
 
     private PGPSecretKeyRingCollection getPgpSecretKeyRingsFromResource(String fileName)
-            throws IOException, URISyntaxException, PGPException {
+            throws IOException, PGPException {
         return PGPainless.readKeyRing().secretKeyRingCollection(getFileInputStreamFromResource(fileName));
     }