Fix for #476

src/CodeCoverage.php

@@ -361,6 +361,8 @@ public function append(array $data, $id = null, $append = true, $linesToBeCovere
         $this->tests[$id] = ['size' => $size, 'status' => $status];
 
         foreach ($data as $file => $lines) {
+            $file = $this->filter->unifyFilename($file);
+
             if (!$this->filter->isFile($file)) {
                 continue;
             }
@@ -387,6 +389,8 @@ public function merge(CodeCoverage $that)
         );
 
         foreach ($that->data as $file => $lines) {
+            $file = $this->filter->unifyFilename($file);
+
             if (!isset($this->data[$file])) {
                 if (!$this->filter->isFiltered($file)) {
                     $this->data[$file] = $lines;
@@ -680,6 +684,8 @@ private function applyIgnoredLinesFilter(array &$data)
     private function initializeFilesThatAreSeenTheFirstTime(array $data)
     {
         foreach ($data as $file => $lines) {
+            $file = $this->filter->unifyFilename($file);
+
             if ($this->filter->isFile($file) && !isset($this->data[$file])) {
                 $this->data[$file] = [];
 

src/Filter.php

@@ -46,7 +46,7 @@ public function addDirectoryToWhitelist($directory, $suffix = '.php', $prefix =
      */
     public function addFileToWhitelist($filename)
     {
-        $this->whitelistedFiles[realpath($filename)] = true;
+        $this->whitelistedFiles[$this->unifyFilename($filename)] = true;
     }
 
     /**
@@ -85,7 +85,7 @@ public function removeDirectoryFromWhitelist($directory, $suffix = '.php', $pref
      */
     public function removeFileFromWhitelist($filename)
     {
-        $filename = realpath($filename);
+        $filename = $this->unifyFilename($filename);
 
         unset($this->whitelistedFiles[$filename]);
     }
@@ -126,7 +126,7 @@ public function isFiltered($filename)
             return true;
         }
 
-        $filename = realpath($filename);
+        $filename = $this->unifyFilename($filename);
 
         return !isset($this->whitelistedFiles[$filename]);
     }
@@ -166,8 +166,24 @@ public function getWhitelistedFiles()
      *
      * @param array $whitelistedFiles
      */
-    public function setWhitelistedFiles($whitelistedFiles)
+    public function setWhitelistedFiles(array $whitelistedFiles)
     {
         $this->whitelistedFiles = $whitelistedFiles;
+
+        $this->addFilesToWhitelist(array_keys($whitelistedFiles));
+    }
+
+    /**
+     * Gets unified filename with lower-cased directory path and original name of file.
+     *
+     * @param string $filename
+     *
+     * @return string
+     */
+    public function unifyFilename($filename)
+    {
+        $filename = realpath($filename);
+
+        return strtolower(dirname($filename)) . DIRECTORY_SEPARATOR . basename($filename);
     }
 }

tests/TestCase.php

@@ -232,8 +232,10 @@ protected function getCoverageForBankAccountForLastTwoTests()
 
     protected function getExpectedDataArrayForBankAccount()
     {
+        $filter = new Filter();
+
         return [
-            TEST_FILES_PATH . 'BankAccount.php' => [
+            $filter->unifyFilename(TEST_FILES_PATH . 'BankAccount.php') => [
                 8 => [
                     0 => 'BankAccountTest::testBalanceIsInitiallyZero',
                     1 => 'BankAccountTest::testDepositWithdrawMoney'

tests/tests/BuilderTest.php

@@ -10,6 +10,7 @@
 
 namespace SebastianBergmann\CodeCoverage\Report;
 
+use SebastianBergmann\CodeCoverage\Filter;
 use SebastianBergmann\CodeCoverage\TestCase;
 use SebastianBergmann\CodeCoverage\Node\Builder;
 
@@ -25,8 +26,9 @@ protected function setUp()
     public function testSomething()
     {
         $root = $this->getCoverageForBankAccount()->getReport();
+        $filter = new Filter();
 
-        $expectedPath = rtrim(TEST_FILES_PATH, DIRECTORY_SEPARATOR);
+        $expectedPath = $filter->unifyFilename(rtrim(TEST_FILES_PATH, DIRECTORY_SEPARATOR));
         $this->assertEquals($expectedPath, $root->getName());
         $this->assertEquals($expectedPath, $root->getPath());
         $this->assertEquals(10, $root->getNumExecutableLines());

tests/tests/FilterTest.php

@@ -69,6 +69,12 @@ protected function setUp()
             TEST_FILES_PATH . 'source_without_ignore.php',
             TEST_FILES_PATH . 'source_without_namespace.php'
         ];
+
+        $filter = $this->filter;
+
+        $this->files = array_map(function($file) use ($filter) {
+            return $filter->unifyFilename($file);
+        }, $this->files);
     }
 
     /**
@@ -78,9 +84,10 @@ protected function setUp()
     public function testAddingAFileToTheWhitelistWorks()
     {
         $this->filter->addFileToWhitelist($this->files[0]);
+        $expected = $this->filter->unifyFilename($this->files[0]);
 
         $this->assertEquals(
-            [$this->files[0]],
+            [$expected],
             $this->filter->getWhitelist()
         );
     }