Add test for compact being used with variable strings (#223)

Tests/VariableAnalysisSniff/VariableAnalysisTest.php

@@ -502,10 +502,33 @@ public function testCompactWarnings() {
       19,
       23,
       26,
+      36,
     ];
     $this->assertEquals($expectedWarnings, $lines);
   }
 
+  public function testCompactWarningsHaveCorrectSniffCodes() {
+    $fixtureFile = $this->getFixture('CompactFixture.php');
+    $phpcsFile = $this->prepareLocalFileForSniffs($fixtureFile);
+    $phpcsFile->ruleset->setSniffProperty(
+      'VariableAnalysis\Sniffs\CodeAnalysis\VariableAnalysisSniff',
+      'allowUnusedParametersBeforeUsed',
+      'false'
+    );
+    $phpcsFile->process();
+
+    $warnings = $phpcsFile->getWarnings();
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable', $warnings[2][49][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable', $warnings[7][23][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable', $warnings[10][54][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable', $warnings[14][52][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable', $warnings[19][5][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable', $warnings[23][23][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable', $warnings[26][66][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable', $warnings[36][5][0]['source']);
+    $this->assertEquals('VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable', $warnings[36][23][0]['source']);
+  }
+
   public function testTraitAllowsThis() {
     $fixtureFile = $this->getFixture('TraitFixture.php');
     $phpcsFile = $this->prepareLocalFileForSniffs($fixtureFile);

Tests/VariableAnalysisSniff/fixtures/CompactFixture.php

@@ -1,32 +1,37 @@
 <?php
-function function_with_literal_compact($param1, $param2, $param3, $param4) {
+function function_with_literal_compact($param1, $param2, $param3, $param4) { // unused variable param2
     $var1 = 'value1';
     $var2 = 'value2';
     $var4 = 'value4';
     $squish = compact('var1');
-    $squish = compact('var3');
+    $squish = compact('var3'); // undefined variable var3
     $squish = compact('param1');
     $squish = compact('var2', /*comment*/ 'param3');
-    $squish = compact(array('var4'), array('param4', 'var5'));
+    $squish = compact(array('var4'), array('param4', 'var5')); // undefined variable var5
     echo $squish;
 }
 
-function function_with_expression_compact($param1, $param2, $param3, $param4) {
+function function_with_expression_compact($param1, $param2, $param3, $param4) { // unused variable param2
     $var1 = "value1";
     $var2 = "value2";
     $var4 = "value4";
     $var6 = "value6";
-    $var7 = "value7";
+    $var7 = "value7"; // unused variale var7 (not actually unused but it's hard to detect that line 28 uses it)
     $var8 = "value8";
     $var9 = "value9";
     $squish = compact("var1");
-    $squish = compact("var3"/*comment*/ );
+    $squish = compact("var3"/*comment*/ ); // undefined variable var3
     $squish = compact("param1");
     $squish = compact("var2", "param3");
-    $squish = compact(array("var4"), array("param4", /*comment*/ "var5"));
+    $squish = compact(array("var4"), array("param4", /*comment*/ "var5")); // undefined variable var5
     $squish = compact($var6);
     $squish = compact("var" . "7");
     $squish = compact("blah $var8");
     $squish = compact("$var9");
     echo $squish;
 }
+
+function foo() {
+    $a = 'Hello';
+    $c = compact( $a, $b ); // Unused variable c and undefined variable b
+}