diff --git a/test/cppunit_test.rb b/test/cppunit_test.rb
index 3bc5e8a..5de5965 100644
--- a/test/cppunit_test.rb
+++ b/test/cppunit_test.rb
@@ -4,7 +4,7 @@
 class CppUnitTest < Test::Unit::TestCase
 
   def testCppUnit
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       output = `./cppunit_test`
       assert_equal 1, $?.exitstatus
       assert_match /^[\.FE]+$/, output
@@ -13,7 +13,7 @@ def testCppUnit
   end
 
   def testCppUnitVersion
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       %w(-v --version).each {|opt|
         output = `./cppunit_test #{opt}`
         assert_equal 0, $?.exitstatus
@@ -23,7 +23,7 @@ def testCppUnitVersion
   end
 
   def testCppUnitHelp
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       %w(-h --help).each {|opt|
         output = `./cppunit_test #{opt}`
         assert_equal 0, $?.exitstatus
@@ -33,7 +33,7 @@ def testCppUnitHelp
   end
 
   def testCppUnitBadOption
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       output, error, status = Open3.capture3 './cppunit_test -X'
       assert_equal 1, status.exitstatus
       assert_match /invalid option -X/, error
@@ -41,7 +41,7 @@ def testCppUnitBadOption
   end
 
   def testCppUnitDisableProgress
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       %w(-p --no-print-progress).each {|opt|
         output = `./cppunit_test #{opt}`
         assert_equal 1, $?.exitstatus
@@ -52,7 +52,7 @@ def testCppUnitDisableProgress
   end
 
   def testCppUnitDisableResult
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       %w(-r --no-print-result).each {|opt|
         output = `./cppunit_test #{opt}`
         assert_equal 1, $?.exitstatus
@@ -63,7 +63,7 @@ def testCppUnitDisableResult
   end
 
   def testCppUnitVerbose
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       %w(-V --verbose).each {|opt|
         output = `./cppunit_test #{opt}`
         assert_equal 1, $?.exitstatus
@@ -74,7 +74,7 @@ def testCppUnitVerbose
   end
 
   def testCppUnitXml
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       %w(-x --xml-output).each {|opt|
         output = `./cppunit_test #{opt}`
         assert_equal 1, $?.exitstatus
@@ -86,7 +86,7 @@ def testCppUnitXml
   end
 
   def testCppUnitByName
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       output = `./cppunit_test -V FooTest`
       assert_equal 1, $?.exitstatus
       assert_match /FooTest/, output
@@ -102,11 +102,15 @@ def testCppUnitByName
   end
 
   def testCppUnitByMethod
-    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', ENV['CONFIGURATION'].to_s)) {
+    Dir.chdir(File.join(File.dirname(__FILE__), '..', 'build', 'test', configuration.to_s)) {
       output = `./cppunit_test -V FooTest::testOk`
       assert_equal 0, $?.exitstatus
       assert_match /FooTest::testOk/, output
       assert_match /OK\s+\(1\stests\)/, output
     }
   end
+
+  def configuration
+    ENV['CONFIGURAtION'] || 'Debug'
+  end
 end