Fix: https://issues.apache.org/jira/browse/FLEX-34839

- Make use of Apache Commons Lang3.SystemUtils for OS detection.
- Make SdkConverterCLI to use the detection.
- Removed the PowerMock lib, couldn't mock static final field, I remove dynamically the final modifier instead.
diff --git a/mavenizer/cli/src/main/java/org/apache/flex/utilities/converter/core/SdkConverterCLI.java b/mavenizer/cli/src/main/java/org/apache/flex/utilities/converter/core/SdkConverterCLI.java
index 9f3d160..918dd70 100644
--- a/mavenizer/cli/src/main/java/org/apache/flex/utilities/converter/core/SdkConverterCLI.java
+++ b/mavenizer/cli/src/main/java/org/apache/flex/utilities/converter/core/SdkConverterCLI.java
@@ -2,7 +2,6 @@
 
 import org.apache.commons.cli.*;
 import org.apache.commons.io.FileUtils;
-import org.apache.commons.lang3.SystemUtils;
 import org.apache.flex.utilities.converter.air.AirConverter;
 import org.apache.flex.utilities.converter.deployer.aether.AetherDeployer;
 import org.apache.flex.utilities.converter.flash.FlashConverter;
@@ -122,14 +121,11 @@
                     platforms.add(PlatformType.valueOf(platformName));
                 }
             }
+
             if(platforms.isEmpty()) {
-                if(SystemUtils.IS_OS_WINDOWS) {
-                    platforms.add(PlatformType.WINDOWS);
-                } else if(SystemUtils.IS_OS_MAC) {
-                    platforms.add(PlatformType.MAC);
-                } else if(SystemUtils.IS_OS_LINUX) {
-                    platforms.add(PlatformType.LINUX);
-                } else {
+                try {
+                    platforms.add(PlatformType.getCurrent());
+                } catch (Exception e) {
                     System.err.println("Unsupported OS type. Provide manually using 'platform' parameter.");
                     System.exit(1);
                 }
diff --git a/mavenizer/retrievers/base/pom.xml b/mavenizer/retrievers/base/pom.xml
index d13b4cb..ace86c6 100644
--- a/mavenizer/retrievers/base/pom.xml
+++ b/mavenizer/retrievers/base/pom.xml
@@ -32,7 +32,7 @@
 
     <properties>
         <powermock.version>1.6.2</powermock.version>
-        <junit.version>4.8.2</junit.version>
+        <junit.version>4.11</junit.version>
     </properties>
 
     <dependencies>
@@ -47,9 +47,9 @@
             <version>1.8.1</version>
         </dependency>
         <dependency>
-            <groupId>commons-lang</groupId>
-            <artifactId>commons-lang</artifactId>
-            <version>2.6</version>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.3.2</version>
         </dependency>
 
         <!--TEST-->
@@ -60,27 +60,9 @@
             <scope>test</scope>
         </dependency>
         <dependency>
-            <groupId>org.powermock</groupId>
-            <artifactId>powermock-module-junit4-rule-agent</artifactId>
-            <version>${powermock.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.powermock</groupId>
-            <artifactId>powermock-module-junit4</artifactId>
-            <version>${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.easymock</groupId>
-            <artifactId>easymock</artifactId>
-            <version>3.3.1</version>
+            <groupId>pl.pragmatists</groupId>
+            <artifactId>JUnitParams</artifactId>
+            <version>1.0.4</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
diff --git a/mavenizer/retrievers/base/src/main/java/org/apache/flex/utilities/converter/retrievers/types/PlatformType.java b/mavenizer/retrievers/base/src/main/java/org/apache/flex/utilities/converter/retrievers/types/PlatformType.java
index 2dceba0..d7320d4 100644
--- a/mavenizer/retrievers/base/src/main/java/org/apache/flex/utilities/converter/retrievers/types/PlatformType.java
+++ b/mavenizer/retrievers/base/src/main/java/org/apache/flex/utilities/converter/retrievers/types/PlatformType.java
@@ -16,6 +16,8 @@
  */
 package org.apache.flex.utilities.converter.retrievers.types;
 
+import org.apache.commons.lang3.SystemUtils;
+
 /**
  * Created by cdutz on 18.05.2014.
  */
@@ -25,95 +27,23 @@
     LINUX,
     MAC;
 
-    public static PlatformType getCurrent()
-    {
+    public static PlatformType getCurrent() throws Exception {
         PlatformType platformType = null;
 
-        if (isWindows())
+        if (SystemUtils.IS_OS_WINDOWS)
         {
             platformType = PlatformType.WINDOWS;
         }
-        else if (isMac())
+        else if (SystemUtils.IS_OS_MAC || SystemUtils.IS_OS_MAC_OSX)
         {
             platformType = PlatformType.MAC;
         }
-        else if (isUnixBased())
+        else if (SystemUtils.IS_OS_UNIX)
         {
             platformType = PlatformType.LINUX;
         }
+        else throw new Exception("Unsupported OS.");
 
         return platformType;
     }
-
-    static final String NET_BSD = "netbsd";
-
-    static final String FREE_BSD = "freebsd";
-
-    static final String WINDOWS_OS = "windows";
-
-    static final String MAC_OS = "mac os x";
-
-    static final String MAC_OS_DARWIN = "darwin";
-
-    static final String LINUX_OS = "linux";
-
-    static final String SOLARIS_OS = "sunos";
-
-    private static String osString()
-    {
-        return System.getProperty( "os.name" ).toLowerCase();
-    }
-
-    /**
-     * Return a boolean to show if we are running on Windows.
-     *
-     * @return true if we are running on Windows.
-     */
-    private static boolean isWindows()
-    {
-        return osString().startsWith( WINDOWS_OS );
-    }
-
-    /**
-     * Return a boolean to show if we are running on Linux.
-     *
-     * @return true if we are running on Linux.
-     */
-    private static boolean isLinux()
-    {
-        return osString().startsWith( LINUX_OS ) ||
-                // I know, but people said that workds...
-                osString().startsWith( NET_BSD ) ||
-                osString().startsWith( FREE_BSD );
-    }
-
-    /**
-     * Return a boolean to show if we are running on Solaris.
-     *
-     * @return true if we are running on Solaris.
-     */
-    private static boolean isSolaris()
-    {
-        return osString().startsWith( SOLARIS_OS );
-    }
-
-    /**
-     * Return a boolean to show if we are running on a unix-based OS.
-     *
-     * @return true if we are running on a unix-based OS.
-     */
-    private static boolean isUnixBased()
-    {
-        return isLinux() || isSolaris();
-    }
-
-    /**
-     * Return a boolean to show if we are running on Mac OS X.
-     *
-     * @return true if we are running on Mac OS X.
-     */
-    private static boolean isMac()
-    {
-        return osString().startsWith( MAC_OS ) || osString().startsWith( MAC_OS_DARWIN );
-    }
 }
diff --git a/mavenizer/retrievers/base/src/main/java/org/apache/flex/utilities/converter/retrievers/utils/ProgressBar.java b/mavenizer/retrievers/base/src/main/java/org/apache/flex/utilities/converter/retrievers/utils/ProgressBar.java
index 72ee855..c15d26b 100644
--- a/mavenizer/retrievers/base/src/main/java/org/apache/flex/utilities/converter/retrievers/utils/ProgressBar.java
+++ b/mavenizer/retrievers/base/src/main/java/org/apache/flex/utilities/converter/retrievers/utils/ProgressBar.java
@@ -16,7 +16,7 @@
  */
 package org.apache.flex.utilities.converter.retrievers.utils;
 
-import org.apache.commons.lang.StringUtils;
+import org.apache.commons.lang3.StringUtils;
 
 /**
  * Created by cdutz on 24.05.2014.
diff --git a/mavenizer/retrievers/base/src/test/java/org/apache/flex/utilities/converter/retrievers/types/PlatformTypeTest.java b/mavenizer/retrievers/base/src/test/java/org/apache/flex/utilities/converter/retrievers/types/PlatformTypeTest.java
index d8571bc..eeb6a22 100644
--- a/mavenizer/retrievers/base/src/test/java/org/apache/flex/utilities/converter/retrievers/types/PlatformTypeTest.java
+++ b/mavenizer/retrievers/base/src/test/java/org/apache/flex/utilities/converter/retrievers/types/PlatformTypeTest.java
@@ -1,61 +1,69 @@
 package org.apache.flex.utilities.converter.retrievers.types;
 
-import org.junit.Rule;
+import junitparams.JUnitParamsRunner;
+import junitparams.Parameters;
+import org.apache.commons.lang3.SystemUtils;
+import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.junit.runners.Parameterized;
-import org.powermock.core.classloader.annotations.PrepareForTest;
-import org.powermock.modules.junit4.rule.PowerMockRule;
 
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
 import java.util.Arrays;
 import java.util.Collection;
 
-import static org.easymock.EasyMock.expect;
 import static org.junit.Assert.assertEquals;
-import static org.powermock.api.easymock.PowerMock.*;
 
 /**
  * @author: Frederic Thomas
  * Date: 12/05/2015
  * Time: 01:34
  */
-@PrepareForTest( { PlatformType.class })
-@RunWith(Parameterized.class)
+@RunWith(JUnitParamsRunner.class)
 public class PlatformTypeTest {
 
-	private String osName;
-	private PlatformType platformType;
+	private Class<SystemUtils> systemUtilsClass;
 
-	@Rule
-	public PowerMockRule powerMockRule = new PowerMockRule();
-
-	@Parameterized.Parameters
-	public static Collection<Object[]> data() {
-
+	public static Collection<Object[]> platformParameters() {
 		return Arrays.asList(new Object[][]{
-				{PlatformType.WINDOWS_OS, PlatformType.WINDOWS},
-				{PlatformType.MAC_OS, PlatformType.MAC},
-				{PlatformType.MAC_OS_DARWIN, PlatformType.MAC},
-				{PlatformType.FREE_BSD, PlatformType.LINUX},
-				{PlatformType.LINUX_OS, PlatformType.LINUX},
-				{PlatformType.NET_BSD, PlatformType.LINUX},
-				{PlatformType.SOLARIS_OS, PlatformType.LINUX}
+				{"IS_OS_WINDOWS", PlatformType.WINDOWS},
+				{"IS_OS_MAC", PlatformType.MAC},
+				{"IS_OS_MAC_OSX", PlatformType.MAC},
+				{"IS_OS_UNIX", PlatformType.LINUX}
 		});
 	}
 
-	public PlatformTypeTest(String osName, PlatformType platformType) {
-		this.osName = osName;
-		this.platformType = platformType;
+	@Before
+	public void setUp() throws Exception {
+		systemUtilsClass = SystemUtils.class;
+
+		setFinalStatic(systemUtilsClass.getField("IS_OS_WINDOWS"), false);
+		setFinalStatic(systemUtilsClass.getField("IS_OS_MAC"), false);
+		setFinalStatic(systemUtilsClass.getField("IS_OS_MAC_OSX"), false);
+		setFinalStatic(systemUtilsClass.getField("IS_OS_UNIX"), false);
 	}
 
 	@Test
-	public void it_returns_the_current_platform_type() throws Exception {
-		mockStatic(System.class);
+	@Parameters(method = "platformParameters")
+	public void it_detects_the_current_platform_type(String fieldName, PlatformType platformType) throws Exception {
 
-		expect(System.getProperty("os.name")).andReturn(osName).anyTimes();
-		replayAll();
-
+		setFinalStatic(systemUtilsClass.getField(fieldName), true);
 		assertEquals(platformType, PlatformType.getCurrent());
-		verifyAll();
+	}
+
+	@Test(expected = Exception.class)
+	public void it_throws_an_exception_when_it_can_not_detect_the_current_platform_type() throws Exception {
+		PlatformType.getCurrent();
+	}
+
+	private static void setFinalStatic(Field field, Object newValue) throws Exception {
+		field.setAccessible(true);
+
+		// remove final modifier from field
+		Field modifiersField = Field.class.getDeclaredField("modifiers");
+		modifiersField.setAccessible(true);
+		modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
+
+		field.set(null, newValue);
 	}
 }