BAEL-4388 Test reading keyStore without trustAnchor (#11785)

core-java-modules/core-java-security-3/src/test/java/com/baeldung/truststore/TrustStoreUnitTest.java

@@ -0,0 +1,29 @@
+package com.baeldung.truststore;
+
+import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+
+import java.io.IOException;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.CertificateException;
+import java.security.cert.PKIXParameters;
+
+public class TrustStoreUnitTest {
+
+    @Test
+    public void whenOpeningTrustStore_thenExceptionIsThrown() throws Exception {
+        KeyStore keyStore = getKeyStore();
+        InvalidAlgorithmParameterException invalidAlgorithmParameterException =
+          Assertions.assertThrows(InvalidAlgorithmParameterException.class, () -> new PKIXParameters(keyStore));
+        Assertions.assertEquals("the trustAnchors parameter must be non-empty", invalidAlgorithmParameterException.getMessage());
+    }
+
+    private KeyStore getKeyStore() throws CertificateException, NoSuchAlgorithmException, IOException, KeyStoreException {
+        KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
+        ks.load(null, "changeIt".toCharArray());
+        return ks;
+    }
+}