diff --git a/addon-test-support/format-violation.ts b/addon-test-support/format-violation.ts
index bd7891ac..ae824ed7 100644
--- a/addon-test-support/format-violation.ts
+++ b/addon-test-support/format-violation.ts
@@ -3,18 +3,13 @@ import type { Result } from 'axe-core';
 /**
  * Formats the axe violation for human consumption
  *
- * @param {AxeViolation} violation
- * @param {string | string[]} markup (optional) string of HTML relevant to the violation
+ * @param {Partial<Result>} violation
+ * @param {string[]} markup (optional) string of HTML relevant to the violation
  */
 export default function formatViolation(
-  violation: Partial<Result> | undefined,
-  markup?: string | string[]
+  violation: Partial<Result>,
+  markup: string[]
 ) {
-  if (!violation) {
-    throw new Error(
-      'formatViolation called without required parameter: violation'
-    );
-  }
   if (!violation.impact || !violation.help || !violation.helpUrl) {
     throw new Error(
       'formatViolation called with improper structure of parameter: violation. Required properties: impact, help, helpUrl.'
@@ -22,19 +17,15 @@ export default function formatViolation(
   }
 
   let count = 1;
+  let formattedMarkup = '';
 
-  if (markup) {
-    if (Array.isArray(markup)) {
-      count = markup.length;
-      markup = markup.join('\n');
-    }
-    markup = ` Offending nodes are: \n${markup}`;
-  } else {
-    markup = '';
+  if (markup.length) {
+    count = markup.length;
+    formattedMarkup = ` Offending nodes are: \n${markup.join('\n')}`;
   }
 
   let plural = count === 1 ? '' : 's';
   let violationCount = `Violated ${count} time${plural}.`;
 
-  return `[${violation.impact}]: ${violation.help} \n${violationCount}${markup}\n${violation.helpUrl}`;
+  return `[${violation.impact}]: ${violation.help} \n${violationCount}${formattedMarkup}\n${violation.helpUrl}`;
 }
diff --git a/tests/unit/format-violation-test.ts b/tests/unit/format-violation-test.ts
index 1f0f385e..4cfc166d 100644
--- a/tests/unit/format-violation-test.ts
+++ b/tests/unit/format-violation-test.ts
@@ -22,7 +22,7 @@ module('Unit | Utils | formatViolation', function () {
       ],
     };
 
-    let message = formatViolation(violation, violation.nodes[0].html);
+    let message = formatViolation(violation, [violation.nodes[0].html]);
     let expected = `[critical]: it should be better \nViolated 1 time. Offending nodes are: \n<input type="text">\nhttp://example.com`;
     assert.equal(message, expected);
   });
@@ -38,7 +38,7 @@ module('Unit | Utils | formatViolation', function () {
       nodes: [],
     };
 
-    let message = formatViolation(violation);
+    let message = formatViolation(violation, []);
     let expected = `[critical]: it should be better \nViolated 1 time.\nhttp://example.com`;
     assert.equal(message, expected);
   });
@@ -64,15 +64,7 @@ module('Unit | Utils | formatViolation', function () {
     let expected = /formatViolation called with improper structure of parameter: violation. Required properties: impact, help, helpUrl./;
 
     assert.throws(function () {
-      formatViolation(violation, violation.nodes[0].html);
-    }, expected);
-  });
-
-  test('validates violation parameter exists', function (assert) {
-    let expected = /formatViolation called without required parameter: violation/;
-
-    assert.throws(function () {
-      formatViolation(undefined);
+      formatViolation(violation, [violation.nodes[0].html]);
     }, expected);
   });
 });