MDL-47180 qformat_webct: Import of calculated questions broken

question/format/webct/format.php

@@ -525,7 +525,7 @@ class qformat_webct extends qformat_default {
                                 break;
 
                             case 'calculated':
-                                foreach ($question->answers as $answer) {
+                                foreach ($question->answer as $answer) {
                                     if ($formulaerror = qtype_calculated_find_formula_errors($answer)) {
                                         $warnings[] = "'$question->name': ". $formulaerror;
                                         $questionok = false;
@@ -535,7 +535,6 @@ class qformat_webct extends qformat_default {
                                     $dataset->itemcount = count($dataset->datasetitem);
                                 }
                                 $question->import_process = true;
-                                unset($question->answer); // Not used in calculated question.
                                 break;
                             case 'match':
                                 // MDL-10680:

question/format/webct/tests/behat/importcalculated.feature

@@ -0,0 +1,30 @@
+@qformat @qformat_webct
+Feature: Test importing calculated question from WebCT format.
+  In order to reuse calculated questions from a commercial LMS
+  As a teacher
+  I need to be able to import them in WebCT format.
+
+  Background:
+    Given the following "courses" exist:
+      | fullname | shortname | format |
+      | Course 1 | C1        | topics |
+    And the following "users" exist:
+      | username | firstname |
+      | teacher  | Teacher   |
+    And the following "course enrolments" exist:
+      | user    | course | role           |
+      | teacher | C1     | editingteacher |
+    And I log in as "teacher"
+    And I follow "Course 1"
+
+  @javascript @_file_upload
+  Scenario: import a WebCT calculated question
+    When I navigate to "Import" node in "Course administration > Question bank"
+    And I set the field "id_format_webct" to "1"
+    And I upload "question/format/webct/tests/fixtures/sample_calculated_webct.txt" file to "Import" filemanager
+    And I press "id_submitbutton"
+    Then I should see "Parsing questions from import file."
+    And I should see "Importing 1 questions from file"
+    And I should see "Find the area in m2 of a square with sides of length {l} m."
+    When I press "Continue"
+    Then I should see "calculated: Square area"

question/format/webct/tests/fixtures/sample_calculated_webct.txt

@@ -0,0 +1,32 @@
+# Start of calculated question: Square area
+:TYPE:C
+:TITLE:calculated: Square area
+:QUESTION:H
+Find the area in m<sup>2</sup> of a square with sides of length {l} m.
+:IMAGE:
+:FORMULA:{l}*{l}
+:l-MIN:10
+:l-MAX:100
+:l-DEC:0
+:VALUES:10
+:l-VAL1:51
+:l-VAL2:32
+:l-VAL3:57
+:l-VAL4:94
+:l-VAL5:38
+:l-VAL6:54
+:l-VAL7:87
+:l-VAL8:90
+:l-VAL9:78
+:l-VAL10:39
+:ANS-DEC:1
+:TOL:
+:TOLTYPE:percent
+:UNITREQ:0
+:UNITSPACE:0
+:UNITCASE:0
+:UNITVAL:0
+:ANSTYPE:dec
+:FEEDBACK:H
+:CAT:Import from WebCT
+# End of calculated question: Square area