#18: extracted Android-specific logic out of the Base64Codec to its own class. Created a factory that can return either depending on environment. Ensured all code other than the lang package is at 100% test coverage.

pom.xml

@@ -70,8 +70,9 @@
         <!-- Test Dependencies: Only required for testing when building.  Not required by users at runtime: -->
         <groovy.version>2.3.0-beta-2</groovy.version>
         <logback.version>1.0.7</logback.version>
-        <easymock.version>3.1</easymock.version>
-        <testng.version>6.8</testng.version>
+        <easymock.version>3.3.1</easymock.version>
+        <junit.version>4.12</junit.version>
+        <powermock.version>1.6.2</powermock.version>
         <failsafe.plugin.version>2.12.4</failsafe.plugin.version>
 
     </properties>
@@ -83,14 +84,6 @@
             <artifactId>slf4j-api</artifactId>
             <version>${slf4j.version}</version>
         </dependency>
-        <!--
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>jcl-over-slf4j</artifactId>
-            <version>${slf4j.version}</version>
-            <scope>runtime</scope>
-        </dependency>
-        -->
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
@@ -107,8 +100,8 @@
         </dependency>
 
         <!-- Provided scope: only used in Android environments - not downloaded as a transitive dependency.
-             This dependency is only a stub of the actual implementation, which means we can't use it at test time
-             during TestNG tests.  An Android environment is required to test for real. -->
+             This dependency is only a stub of the actual implementation, which means we can't use it at test time.
+             An Android environment is required to test for real. -->
         <dependency>
             <groupId>com.google.android</groupId>
             <artifactId>android</artifactId>
@@ -129,12 +122,6 @@
             <version>${logback.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.testng</groupId>
-            <artifactId>testng</artifactId>
-            <version>${testng.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-all</artifactId>
@@ -147,6 +134,30 @@
             <version>${easymock.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.powermock</groupId>
+            <artifactId>powermock-module-junit4</artifactId>
+            <version>${powermock.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.powermock</groupId>
+            <artifactId>powermock-api-easymock</artifactId>
+            <version>${powermock.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.powermock</groupId>
+            <artifactId>powermock-core</artifactId>
+            <version>${powermock.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
 
     </dependencies>
 

src/main/java/io/jsonwebtoken/impl/AndroidBase64Codec.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2015 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.jsonwebtoken.impl;
+
+public class AndroidBase64Codec extends AbstractTextCodec {
+
+    @Override
+    public String encode(byte[] data) {
+        int flags = android.util.Base64.NO_PADDING | android.util.Base64.NO_WRAP;
+        return android.util.Base64.encodeToString(data, flags);
+    }
+
+    @Override
+    public byte[] decode(String encoded) {
+        return android.util.Base64.decode(encoded, android.util.Base64.DEFAULT);
+    }
+}

src/main/java/io/jsonwebtoken/impl/Base64Codec.java

@@ -17,45 +17,12 @@ package io.jsonwebtoken.impl;
 
 public class Base64Codec extends AbstractTextCodec {
 
-    private static final boolean ANDROID = isAndroid();
-
-    private static boolean isAndroid() {
-
-        String name = System.getProperty("java.vm.name");
-        if (name != null) {
-            String lcase = name.toLowerCase();
-            return lcase.contains("dalvik");
-        }
-
-        name = System.getProperty("java.vm.vendor");
-        if (name != null) {
-            String lcase = name.toLowerCase();
-            return lcase.contains("android");
-        }
-
-        return false;
-    }
-
     public String encode(byte[] data) {
-
-        if (ANDROID) {
-            int flags = android.util.Base64.NO_PADDING | android.util.Base64.NO_WRAP;
-            return android.util.Base64.encodeToString(data, flags);
-        }
-
-        //else, assume standard JVM
         return javax.xml.bind.DatatypeConverter.printBase64Binary(data);
     }
 
     @Override
     public byte[] decode(String encoded) {
-
-        if (ANDROID) {
-            return android.util.Base64.decode(encoded, android.util.Base64.DEFAULT);
-        }
-
-        //else assume standard JVM:
         return javax.xml.bind.DatatypeConverter.parseBase64Binary(encoded);
     }
-
 }

src/main/java/io/jsonwebtoken/impl/DefaultTextCodecFactory.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2015 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.jsonwebtoken.impl;
+
+public class DefaultTextCodecFactory implements TextCodecFactory {
+
+    protected String getSystemProperty(String key) {
+        return System.getProperty(key);
+    }
+
+    protected boolean isAndroid() {
+
+        String name = getSystemProperty("java.vm.name");
+        if (name != null) {
+            String lcase = name.toLowerCase();
+            return lcase.contains("dalvik");
+        }
+
+        name = getSystemProperty("java.vm.vendor");
+        if (name != null) {
+            String lcase = name.toLowerCase();
+            return lcase.contains("android");
+        }
+
+        return false;
+    }
+
+
+    @Override
+    public TextCodec getTextCodec() {
+
+        if (isAndroid()) {
+            return new AndroidBase64Codec();
+        }
+
+        return new Base64Codec();
+    }
+}

src/main/java/io/jsonwebtoken/impl/TextCodec.java

@@ -17,7 +17,7 @@ package io.jsonwebtoken.impl;
 
 public interface TextCodec {
 
-    public static final TextCodec BASE64    = new Base64Codec();
+    public static final TextCodec BASE64    = new DefaultTextCodecFactory().getTextCodec();
     public static final TextCodec BASE64URL = new Base64UrlCodec();
 
     String encode(String data);

src/main/java/io/jsonwebtoken/impl/TextCodecFactory.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2015 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.jsonwebtoken.impl;
+
+public interface TextCodecFactory {
+
+    TextCodec getTextCodec();
+}

src/test/groovy/io/jsonwebtoken/ExpiredJwtExceptionTest.groovy

@@ -15,9 +15,8 @@
  */
 package io.jsonwebtoken
 
-import org.testng.annotations.Test
-
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class ExpiredJwtExceptionTest {
 

src/test/groovy/io/jsonwebtoken/JwtHandlerAdapterTest.groovy

@@ -15,9 +15,8 @@
  */
 package io.jsonwebtoken
 
-import org.testng.annotations.Test
-
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class JwtHandlerAdapterTest {
 

src/test/groovy/io/jsonwebtoken/JwtParserTest.groovy

@@ -16,13 +16,12 @@
 package io.jsonwebtoken
 
 import io.jsonwebtoken.impl.TextCodec
-import org.testng.annotations.Test
 
 import javax.crypto.spec.SecretKeySpec
 import java.security.SecureRandom
 
-import static org.testng.Assert.*
-
+import org.junit.Test
+import static org.junit.Assert.*
 
 class JwtParserTest {
 
@@ -97,7 +96,7 @@ class JwtParserTest {
             Jwts.parser().setSigningKey(randomKey()).parse(bad);
             fail()
         } catch (SignatureException se) {
-            assertEquals se.getMessage(), "Unsupported signature algorithm '$badAlgorithmName'"
+            assertEquals se.getMessage(), "Unsupported signature algorithm '$badAlgorithmName'".toString()
         }
     }
 

src/test/groovy/io/jsonwebtoken/JwtsTest.groovy

@@ -22,7 +22,6 @@ import io.jsonwebtoken.impl.TextCodec
 import io.jsonwebtoken.impl.crypto.EllipticCurveProvider
 import io.jsonwebtoken.impl.crypto.MacProvider
 import io.jsonwebtoken.impl.crypto.RsaProvider
-import org.testng.annotations.Test
 
 import javax.crypto.Mac
 import javax.crypto.spec.SecretKeySpec
@@ -31,7 +30,8 @@ import java.security.KeyPair
 import java.security.PrivateKey
 import java.security.PublicKey
 
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class JwtsTest {
 
@@ -108,20 +108,20 @@ class JwtsTest {
 
         def token = Jwts.parser().parse(jwt);
 
-        assertEquals token.body, claims
+        assert token.body == claims
     }
 
-    @Test(expectedExceptions = IllegalArgumentException)
+    @Test(expected = IllegalArgumentException)
     void testParseNull() {
         Jwts.parser().parse(null)
     }
 
-    @Test(expectedExceptions = IllegalArgumentException)
+    @Test(expected = IllegalArgumentException)
     void testParseEmptyString() {
         Jwts.parser().parse('')
     }
 
-    @Test(expectedExceptions = IllegalArgumentException)
+    @Test(expected = IllegalArgumentException)
     void testParseWhitespaceString() {
         Jwts.parser().parse('   ')
     }
@@ -537,10 +537,8 @@ class JwtsTest {
 
         def token = Jwts.parser().setSigningKey(key).parse(jwt);
 
-        assertEquals token.header, [alg: alg.name()]
-
-        assertEquals token.body, claims
-
+        assert [alg: alg.name()] == token.header
+        assert token.body == claims
     }
 
     static void testHmac(SignatureAlgorithm alg) {
@@ -553,9 +551,8 @@ class JwtsTest {
 
         def token = Jwts.parser().setSigningKey(key).parse(jwt)
 
-        assertEquals token.header, [alg: alg.name()]
-
-        assertEquals token.body, claims
+        assert token.header == [alg: alg.name()]
+        assert token.body == claims
     }
 
     static void testEC(SignatureAlgorithm alg, boolean verifyWithPrivateKey=false) {
@@ -575,9 +572,8 @@ class JwtsTest {
 
         def token = Jwts.parser().setSigningKey(key).parse(jwt);
 
-        assertEquals token.header, [alg: alg.name()]
-
-        assertEquals token.body, claims
+        assert token.header == [alg: alg.name()]
+        assert token.body == claims
     }
 }
 

src/test/groovy/io/jsonwebtoken/PrematureJwtExceptionTest.groovy

@@ -15,9 +15,8 @@
  */
 package io.jsonwebtoken
 
-import org.testng.annotations.Test
-
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class PrematureJwtExceptionTest {
 

src/test/groovy/io/jsonwebtoken/SignatureAlgorithmTest.groovy

@@ -15,9 +15,8 @@
  */
 package io.jsonwebtoken
 
-import org.testng.annotations.Test
-
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class SignatureAlgorithmTest {
 
@@ -38,7 +37,7 @@ class SignatureAlgorithmTest {
         assert alg.description != null && alg.description != ""
     }
 
-    @Test(expectedExceptions = SignatureException)
+    @Test(expected = SignatureException)
     void testUnrecognizedAlgorithmName() {
         SignatureAlgorithm.forName('whatever')
     }

src/test/groovy/io/jsonwebtoken/impl/AndroidBase64CodecTest.groovy

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2015 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.jsonwebtoken.impl
+
+import android.util.Base64
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.powermock.core.classloader.annotations.PrepareForTest
+import org.powermock.modules.junit4.PowerMockRunner
+
+import static org.easymock.EasyMock.*
+import static org.junit.Assert.*
+import static org.powermock.api.easymock.PowerMock.mockStatic
+import static org.powermock.api.easymock.PowerMock.replayAll
+import static org.powermock.api.easymock.PowerMock.verifyAll
+
+@RunWith(PowerMockRunner.class)
+@PrepareForTest([Base64.class])
+class AndroidBase64CodecTest {
+
+    @Test
+    public void testEncode() {
+
+        mockStatic(Base64.class);
+
+        byte[] bytes = new byte[32];
+        String s = "foo";
+        int flags = Base64.NO_PADDING | Base64.NO_WRAP;
+
+        expect(Base64.encodeToString(same(bytes), eq(flags))).andReturn(s);
+        replayAll();
+
+        AndroidBase64Codec codec = new AndroidBase64Codec();
+
+        String val = codec.encode(bytes);
+
+        verifyAll();
+        assertEquals(val, s);
+    }
+
+    @Test
+    public void testDecode() {
+
+        mockStatic(Base64.class);
+
+        byte[] bytes = new byte[32];
+        String s = "foo";
+
+        expect(Base64.decode((String)same(s), eq(Base64.DEFAULT))).andReturn(bytes);
+        replayAll();
+
+        AndroidBase64Codec codec = new AndroidBase64Codec();
+
+        def val = codec.decode(s);
+
+        verifyAll();
+        assertSame bytes, val
+    }
+}

src/test/groovy/io/jsonwebtoken/impl/DefaultHeaderTest.groovy

@@ -15,8 +15,8 @@
  */
 package io.jsonwebtoken.impl
 
-import org.testng.annotations.Test
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class DefaultHeaderTest {
 

src/test/groovy/io/jsonwebtoken/impl/DefaultJwsHeaderTest.groovy

@@ -15,8 +15,8 @@
  */
 package io.jsonwebtoken.impl
 
-import org.testng.annotations.Test
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class DefaultJwsHeaderTest {
 

src/test/groovy/io/jsonwebtoken/impl/DefaultJwsTest.groovy

@@ -17,8 +17,8 @@ package io.jsonwebtoken.impl
 
 import io.jsonwebtoken.JwsHeader
 import io.jsonwebtoken.Jwts
-import org.testng.annotations.Test
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class DefaultJwsTest {
 

src/test/groovy/io/jsonwebtoken/impl/DefaultJwtBuilderTest.groovy

@@ -20,8 +20,8 @@ import com.fasterxml.jackson.databind.JsonMappingException
 import io.jsonwebtoken.Jwts
 import io.jsonwebtoken.SignatureAlgorithm
 import io.jsonwebtoken.impl.crypto.MacProvider
-import org.testng.annotations.Test
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class DefaultJwtBuilderTest {
 

src/test/groovy/io/jsonwebtoken/impl/DefaultTextCodecFactoryTest.groovy

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2015 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.jsonwebtoken.impl
+
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.powermock.core.classloader.annotations.PrepareForTest
+import org.powermock.modules.junit4.PowerMockRunner
+
+import static org.junit.Assert.*
+
+@RunWith(PowerMockRunner.class)
+@PrepareForTest([System.class])
+class DefaultTextCodecFactoryTest {
+
+    @Test
+    void testIsAndroidByVmName() {
+
+        def factory = new DefaultTextCodecFactory() {
+            @Override
+            protected String getSystemProperty(String key) {
+                return 'dalvik'
+            }
+        }
+
+        assertTrue factory.getTextCodec() instanceof AndroidBase64Codec
+    }
+
+    @Test
+    void testIsAndroidByNullVmName() {
+
+        def factory = new DefaultTextCodecFactory() {
+            @Override
+            protected String getSystemProperty(String key) {
+                if (key == 'java.vm.name') return null;
+                return 'android'
+            }
+        }
+
+        assertTrue factory.getTextCodec() instanceof AndroidBase64Codec
+    }
+
+    @Test
+    void testIsAndroidByNullVmNameAndNullVendorName() {
+
+        def factory = new DefaultTextCodecFactory() {
+            @Override
+            protected String getSystemProperty(String key) {
+                return null
+            }
+        }
+
+        assertFalse factory.getTextCodec() instanceof AndroidBase64Codec
+    }
+}

src/test/groovy/io/jsonwebtoken/impl/JwtMapTest.groovy

@@ -15,8 +15,8 @@
  */
 package io.jsonwebtoken.impl
 
-import org.testng.annotations.Test
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class JwtMapTest {
 
@@ -115,6 +115,7 @@ class JwtMapTest {
     void testValues() {
         def m = new JwtMap()
         m.putAll([a: 'b', c: 'd'])
-        assertEquals( m.values(), ['b', 'd'] as Set)
+        def s = ['b', 'd']
+        assertTrue m.values().containsAll(s) && s.containsAll(m.values())
     }
 }

src/test/groovy/io/jsonwebtoken/impl/crypto/DefaultSignatureValidatorFactoryTest.groovy

@@ -16,8 +16,8 @@
 package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
-import org.testng.annotations.Test
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class DefaultSignatureValidatorFactoryTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/DefaultSignerFactoryTest.groovy

@@ -16,11 +16,8 @@
 package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
-import org.testng.annotations.Test
-
-import javax.crypto.spec.SecretKeySpec
-
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class DefaultSignerFactoryTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/EllipticCurveProviderTest.groovy

@@ -16,15 +16,14 @@
 package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
-import org.testng.annotations.Test
 
 import java.security.KeyPair
 import java.security.NoSuchProviderException
 import java.security.interfaces.ECPrivateKey
 import java.security.interfaces.ECPublicKey
 
-import static org.testng.Assert.*
-
+import org.junit.Test
+import static org.junit.Assert.*
 
 class EllipticCurveProviderTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/EllipticCurveSignatureValidatorTest.groovy

@@ -17,13 +17,13 @@ package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
 import io.jsonwebtoken.SignatureException
-import org.testng.annotations.Test
 
 import java.security.InvalidKeyException
 import java.security.PublicKey
 import java.security.Signature
 
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class EllipticCurveSignatureValidatorTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/EllipticCurveSignerTest.groovy

@@ -17,14 +17,14 @@ package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
 import io.jsonwebtoken.SignatureException
-import org.testng.annotations.Test
 
 import java.security.InvalidKeyException
 import java.security.KeyPair
 import java.security.PrivateKey
 import java.security.PublicKey
 
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class EllipticCurveSignerTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/MacProviderTest.groovy

@@ -16,10 +16,8 @@
 package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
-import org.testng.annotations.Test
-
-import static org.testng.Assert.*
-
+import org.junit.Test
+import static org.junit.Assert.*
 
 class MacProviderTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/MacSignerTest.groovy

@@ -17,8 +17,8 @@ package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
 import io.jsonwebtoken.SignatureException
-import org.testng.annotations.Test
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 import javax.crypto.Mac
 import java.security.InvalidKeyException

src/test/groovy/io/jsonwebtoken/impl/crypto/RsaProviderTest.groovy

@@ -17,7 +17,6 @@ package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
 import io.jsonwebtoken.SignatureException
-import org.testng.annotations.Test
 
 import java.security.InvalidAlgorithmParameterException
 import java.security.KeyPair
@@ -26,7 +25,8 @@ import java.security.interfaces.RSAPrivateKey
 import java.security.interfaces.RSAPublicKey
 import java.security.spec.PSSParameterSpec
 
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class RsaProviderTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/RsaSignatureValidatorTest.groovy

@@ -17,7 +17,6 @@ package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
 import io.jsonwebtoken.SignatureException
-import org.testng.annotations.Test
 
 import java.security.InvalidKeyException
 import java.security.KeyPair
@@ -26,10 +25,8 @@ import java.security.PrivateKey
 import java.security.PublicKey
 import java.security.Signature
 
-import static org.testng.Assert.assertEquals
-import static org.testng.Assert.assertSame
-import static org.testng.Assert.fail
-
+import org.junit.Test
+import static org.junit.Assert.*
 
 class RsaSignatureValidatorTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/RsaSignerTest.groovy

@@ -17,7 +17,6 @@ package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
 import io.jsonwebtoken.SignatureException
-import org.testng.annotations.Test
 
 import javax.crypto.spec.SecretKeySpec
 import java.security.InvalidKeyException
@@ -26,7 +25,8 @@ import java.security.KeyPairGenerator
 import java.security.PrivateKey
 import java.security.PublicKey
 
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class RsaSignerTest {
 

src/test/groovy/io/jsonwebtoken/impl/crypto/SignatureProviderTest.groovy

@@ -17,12 +17,12 @@ package io.jsonwebtoken.impl.crypto
 
 import io.jsonwebtoken.SignatureAlgorithm
 import io.jsonwebtoken.SignatureException
-import org.testng.annotations.Test
 
 import java.security.NoSuchAlgorithmException
 import java.security.Signature
 
-import static org.testng.Assert.*
+import org.junit.Test
+import static org.junit.Assert.*
 
 class SignatureProviderTest {