Use PHPUnit\Framework\TestCase instead of PHPUnit_Framework_TestCase (#271)

Use the `PHPUnit\Framework\TestCase` notation instead of `PHPUnit_Framework_TestCase` while extending our TestCases. This will help us migrate to PHPUnit 6, that [no longer support snake case class names](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-6.0.md#changed-1).

Author: carusogabriel

tests/PhpSpreadsheetTests/Calculation/CalculationTest.php

@@ -4,9 +4,9 @@
 
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
-class CalculationTest extends PHPUnit_Framework_TestCase
+class CalculationTest extends TestCase
 {
     public function setUp()
     {

tests/PhpSpreadsheetTests/Calculation/DateTimeTest.php

@@ -5,12 +5,12 @@
 use PhpOffice\PhpSpreadsheet\Calculation\DateTime;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 use PhpOffice\PhpSpreadsheet\Shared\Date;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class DateTimeTest.
  */
-class DateTimeTest extends PHPUnit_Framework_TestCase
+class DateTimeTest extends TestCase
 {
     public function setUp()
     {

tests/PhpSpreadsheetTests/Calculation/EngineeringTest.php

@@ -5,9 +5,9 @@
 use PhpOffice\PhpSpreadsheet\Calculation\Engineering;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 use PhpOffice\PhpSpreadsheetTests\Custom\ComplexAssert;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
-class EngineeringTest extends PHPUnit_Framework_TestCase
+class EngineeringTest extends TestCase
 {
     /**
      * @var ComplexAssert

tests/PhpSpreadsheetTests/Calculation/FinancialTest.php

@@ -4,9 +4,9 @@
 
 use PhpOffice\PhpSpreadsheet\Calculation\Financial;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
-class FinancialTest extends PHPUnit_Framework_TestCase
+class FinancialTest extends TestCase
 {
     public function setUp()
     {

tests/PhpSpreadsheetTests/Calculation/FunctionsTest.php

@@ -3,9 +3,9 @@
 namespace PhpOffice\PhpSpreadsheetTests\Calculation;
 
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
-class FunctionsTest extends PHPUnit_Framework_TestCase
+class FunctionsTest extends TestCase
 {
     public function setUp()
     {

tests/PhpSpreadsheetTests/Calculation/LogicalTest.php

@@ -4,9 +4,9 @@
 
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 use PhpOffice\PhpSpreadsheet\Calculation\Logical;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
-class LogicalTest extends PHPUnit_Framework_TestCase
+class LogicalTest extends TestCase
 {
     public function setUp()
     {

tests/PhpSpreadsheetTests/Calculation/LookupRefTest.php

@@ -4,12 +4,12 @@
 
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 use PhpOffice\PhpSpreadsheet\Calculation\LookupRef;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class LookupRefTest.
  */
-class LookupRefTest extends PHPUnit_Framework_TestCase
+class LookupRefTest extends TestCase
 {
     public function setUp()
     {

tests/PhpSpreadsheetTests/Calculation/MathTrigTest.php

@@ -5,9 +5,9 @@
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 use PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
-class MathTrigTest extends PHPUnit_Framework_TestCase
+class MathTrigTest extends TestCase
 {
     public function setUp()
     {

tests/PhpSpreadsheetTests/Calculation/TextDataTest.php

@@ -6,9 +6,9 @@
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 use PhpOffice\PhpSpreadsheet\Calculation\TextData;
 use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
-class TextDataTest extends PHPUnit_Framework_TestCase
+class TextDataTest extends TestCase
 {
     public function setUp()
     {

tests/PhpSpreadsheetTests/Cell/AdvancedValueBinderTest.php

@@ -9,9 +9,9 @@
 use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
-class AdvancedValueBinderTest extends PHPUnit_Framework_TestCase
+class AdvancedValueBinderTest extends TestCase
 {
     public function provider()
     {