Simplify ghostscript util test for -dSAFER command

With the simple test that only checks that malicious code is not executed
we can theoretically have false positive result if command itself
will not work. The idea is that we run more simplistic commands which are
expected to work the same way in more environments.

QA-12194

Autoported commit.
Original commit hash: [dd6071c3a]

Author: yulian-gaponenko

itext.tests/itext.io.tests/itext/io/util/GhostscriptHelperTest.cs

@@ -146,38 +146,21 @@ public virtual void RunGhostScriptTestForAllPages() {
 
         [NUnit.Framework.Test]
         public virtual void DSaferParamInGhostScriptHelperTest() {
-            String cmpPdf = sourceFolder + "maliciousPsInvokingCalcExe.ps";
-            String maliciousPsInvokingCalcExe = destinationFolder + "maliciousPsInvokingCalcExe.png";
-            int majorVersion = 0;
-            int minorVersion = 0;
-            bool isWindows = IdentifyOsType().ToLowerInvariant().Contains("win");
-            if (isWindows) {
-                String gsExec = SystemUtil.GetEnvironmentVariable(GhostscriptHelper.GHOSTSCRIPT_ENVIRONMENT_VARIABLE);
-                if (gsExec == null) {
-                    gsExec = SystemUtil.GetEnvironmentVariable(GhostscriptHelper.GHOSTSCRIPT_ENVIRONMENT_VARIABLE_LEGACY);
-                }
-                String[] pathParts = iText.IO.Util.StringUtil.Split(gsExec, "\\d\\.\\d\\d");
-                for (int i = 0; i < pathParts.Length; i++) {
-                    gsExec = gsExec.Replace(pathParts[i], "");
-                }
-                String[] version = iText.IO.Util.StringUtil.Split(gsExec, "\\.");
-                majorVersion = Convert.ToInt32(version[0], System.Globalization.CultureInfo.InvariantCulture);
-                minorVersion = Convert.ToInt32(version[1], System.Globalization.CultureInfo.InvariantCulture);
-            }
+            String input = sourceFolder + "unsafePostScript.ps";
+            String outputName = "unsafePostScript.png";
+            String maliciousResult1 = destinationFolder + "output1.txt";
+            String maliciousResult2 = destinationFolder + "output2.txt";
             try {
                 GhostscriptHelper ghostscriptHelper = new GhostscriptHelper();
-                ghostscriptHelper.RunGhostScriptImageGeneration(cmpPdf, destinationFolder, "maliciousPsInvokingCalcExe.png"
-                    );
-                if (isWindows) {
-                    NUnit.Framework.Assert.IsTrue((majorVersion > 9 || (majorVersion == 9 && minorVersion >= 50)));
-                }
+                ghostscriptHelper.RunGhostScriptImageGeneration(input, destinationFolder, outputName);
             }
             catch (GhostscriptHelper.GhostscriptExecutionException) {
-                if (isWindows) {
-                    NUnit.Framework.Assert.IsTrue((majorVersion < 9 || (majorVersion == 9 && minorVersion < 50)));
-                }
+                System.Console.Out.WriteLine("Error code was returned on processing of malicious script with -dSAFER option enabled. "
+                     + "This is expected for some environments and ghostscript versions. " + "We assert only the absence of malicious script result (created file).\n"
+                    );
             }
-            NUnit.Framework.Assert.IsFalse(FileUtil.FileExists(maliciousPsInvokingCalcExe));
+            NUnit.Framework.Assert.IsFalse(FileUtil.FileExists(maliciousResult1));
+            NUnit.Framework.Assert.IsFalse(FileUtil.FileExists(maliciousResult2));
         }
 
         [NUnit.Framework.Test]
@@ -194,16 +177,5 @@ public virtual void GhostScriptImageGenerationTest() {
             NUnit.Framework.Assert.IsTrue(imageMagickHelper.RunImageMagickImageCompare(resultantImage, cmpResultantImage
                 , diff));
         }
-
-        /// <summary>Identifies type of current OS and return it (win, linux).</summary>
-        /// <returns>
-        /// type of current os as
-        /// <see cref="System.String"/>
-        /// </returns>
-        private static String IdentifyOsType() {
-            String os = Environment.GetEnvironmentVariable("os.name") == null ? Environment.GetEnvironmentVariable("OS"
-                ) : Environment.GetEnvironmentVariable("os.name");
-            return os.ToLowerInvariant();
-        }
     }
 }

itext.tests/itext.io.tests/resources/itext/io/util/GhostscriptHelperTest/maliciousPsInvokingCalcExe.ps

@@ -1 +1 @@
-2c8594cff3a3178071365f6c0c984876ab3af968
+dd6071c3ac05b5901e1b4b66e94949f6817eca66