Add editor pattern test in BracketedPatternTest

CHANGELOG.md

@@ -93,6 +93,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We fixed an issue where no preview could be generated for some entry types and led to an exception [#9947](https://github.com/JabRef/jabref/issues/9947)
 - We fixed an issue where the Linux terminal working directory argument was malformed and therefore ignored upon opening a terminal [#9953](https://github.com/JabRef/jabref/issues/9953)
 - We fixed an issue where an Automatic Keyword Group could not be deleted in the UI. [#9778](https://github.com/JabRef/jabref/issues/9778)
+- We fixed an issue where the citation key pattern `[edtrN_M]` returned the wrong editor. [#9946](https://github.com/JabRef/jabref/pull/9946)
 
 ### Removed
 

src/main/java/org/jabref/logic/citationkeypattern/BracketedPattern.java

@@ -421,7 +421,7 @@ public static String getFieldValue(BibEntry entry, String pattern, Character key
                     String[] nums = pattern.substring(4).split("_");
                     return authNofMth(editorList,
                             Integer.parseInt(nums[0]),
-                            Integer.parseInt(nums[1]) - 1);
+                            Integer.parseInt(nums[1]));
                 } else if (pattern.matches("edtr\\d+")) {
                     String fa = firstAuthor(editorList);
                     int num = Integer.parseInt(pattern.substring(4));

src/test/java/org/jabref/logic/citationkeypattern/BracketedPatternTest.java

@@ -660,4 +660,27 @@ void expandBracketsWithoutProtectiveBracesUsingUnprotectTermsModifier() {
                 .withField(StandardField.JOURNAL, "{ACS} Medicinal Chemistry Letters");
         assertEquals("ACS Medicinal Chemistry Letters", BracketedPattern.expandBrackets("[JOURNAL:unprotect_terms]", null, bibEntry, null));
     }
+
+    @ParameterizedTest
+    @CsvSource({
+            "'Newton', '[edtr]', 'Isaac Newton'",
+            "'I', '[edtrForeIni]', 'Isaac Newton'",
+            "'Newton', '[editors]', 'Isaac Newton'",
+            "'Ne', '[edtrIni2]', 'Isaac Newton'",
+            "'New', '[edtr3]', 'Isaac Newton'",
+            "'Newton', '[edtr7]', 'Isaac Newton'",
+            "'New', '[edtr3_1]', 'Isaac Newton'",
+            "'Newton.Maxwell', '[edtr.edtr.ea]', 'Isaac Newton and James Maxwell'",
+            "'Newton', '[edtrshort]', 'Isaac Newton'",
+            "'Newton', '[editorLast]', 'Isaac Newton'",
+            "'I', '[editorLastForeIni]', 'Isaac Newton'",
+
+            "'EUASA', '[editors]', '{European Union Aviation Safety Agency}'"
+    })
+
+    void testEditorFieldMarkers(String expectedCitationKey, String pattern, String editor) {
+        BibEntry bibEntry = new BibEntry().withField(StandardField.EDITOR, editor);
+        BracketedPattern bracketedPattern = new BracketedPattern(pattern);
+        assertEquals(expectedCitationKey, bracketedPattern.expand(bibEntry));
+    }
 }