diff --git a/lib/rule-tester/flat-rule-tester.js b/lib/rule-tester/flat-rule-tester.js
index fa096c6dec5..1e2f80b0612 100644
--- a/lib/rule-tester/flat-rule-tester.js
+++ b/lib/rule-tester/flat-rule-tester.js
@@ -1008,10 +1008,10 @@ class FlatRuleTester {
          * This creates a mocha test suite and pipes all supplied info through
          * one of the templates above.
          */
-        FlatRuleTester.describe(ruleName, () => {
-            FlatRuleTester.describe("valid", () => {
+        this.constructor.describe(ruleName, () => {
+            this.constructor.describe("valid", () => {
                 test.valid.forEach(valid => {
-                    FlatRuleTester[valid.only ? "itOnly" : "it"](
+                    this.constructor[valid.only ? "itOnly" : "it"](
                         sanitize(typeof valid === "object" ? valid.name || valid.code : valid),
                         () => {
                             testValidTemplate(valid);
@@ -1020,9 +1020,9 @@ class FlatRuleTester {
                 });
             });
 
-            FlatRuleTester.describe("invalid", () => {
+            this.constructor.describe("invalid", () => {
                 test.invalid.forEach(invalid => {
-                    FlatRuleTester[invalid.only ? "itOnly" : "it"](
+                    this.constructor[invalid.only ? "itOnly" : "it"](
                         sanitize(invalid.name || invalid.code),
                         () => {
                             testInvalidTemplate(invalid);
diff --git a/tests/lib/rule-tester/flat-rule-tester.js b/tests/lib/rule-tester/flat-rule-tester.js
index 3ff6eface26..465dc04ed59 100644
--- a/tests/lib/rule-tester/flat-rule-tester.js
+++ b/tests/lib/rule-tester/flat-rule-tester.js
@@ -2131,27 +2131,27 @@ describe("FlatRuleTester", () => {
         });
     });
 
-    describe("naming test cases", () => {
-
-        /**
-         * Asserts that a particular value will be emitted from an EventEmitter.
-         * @param {EventEmitter} emitter The emitter that should emit a value
-         * @param {string} emitType The type of emission to listen for
-         * @param {any} expectedValue The value that should be emitted
-         * @returns {Promise<void>} A Promise that fulfills if the value is emitted, and rejects if something else is emitted.
-         * The Promise will be indefinitely pending if no value is emitted.
-         */
-        function assertEmitted(emitter, emitType, expectedValue) {
-            return new Promise((resolve, reject) => {
-                emitter.once(emitType, emittedValue => {
-                    if (emittedValue === expectedValue) {
-                        resolve();
-                    } else {
-                        reject(new Error(`Expected ${expectedValue} to be emitted but ${emittedValue} was emitted instead.`));
-                    }
-                });
+    /**
+     * Asserts that a particular value will be emitted from an EventEmitter.
+     * @param {EventEmitter} emitter The emitter that should emit a value
+     * @param {string} emitType The type of emission to listen for
+     * @param {any} expectedValue The value that should be emitted
+     * @returns {Promise<void>} A Promise that fulfills if the value is emitted, and rejects if something else is emitted.
+     * The Promise will be indefinitely pending if no value is emitted.
+     */
+    function assertEmitted(emitter, emitType, expectedValue) {
+        return new Promise((resolve, reject) => {
+            emitter.once(emitType, emittedValue => {
+                if (emittedValue === expectedValue) {
+                    resolve();
+                } else {
+                    reject(new Error(`Expected ${expectedValue} to be emitted but ${emittedValue} was emitted instead.`));
+                }
             });
-        }
+        });
+    }
+
+    describe("naming test cases", () => {
 
         it("should use the first argument as the name of the test suite", () => {
             const assertion = assertEmitted(ruleTesterTestEmitter, "describe", "this-is-a-rule-name");
@@ -2464,4 +2464,49 @@ describe("FlatRuleTester", () => {
         });
     });
 
+    describe("Subclassing", () => {
+        it("should allow subclasses to s`et the describe/it/itOnly statics and should correctly use those values", () => {
+            const assertionDescribe = assertEmitted(ruleTesterTestEmitter, "custom describe", "this-is-a-rule-name");
+            const assertionIt = assertEmitted(ruleTesterTestEmitter, "custom it", "valid(code);");
+            const assertionItOnly = assertEmitted(ruleTesterTestEmitter, "custom itOnly", "validOnly(code);");
+
+            /**
+             * Subclass for testing
+             */
+            class RuleTesterSubclass extends FlatRuleTester { }
+            RuleTesterSubclass.describe = function(text, method) {
+                ruleTesterTestEmitter.emit("custom describe", text, method);
+                return method.call(this);
+            };
+            RuleTesterSubclass.it = function(text, method) {
+                ruleTesterTestEmitter.emit("custom it", text, method);
+                return method.call(this);
+            };
+            RuleTesterSubclass.itOnly = function(text, method) {
+                ruleTesterTestEmitter.emit("custom itOnly", text, method);
+                return method.call(this);
+            };
+
+            const ruleTesterSubclass = new RuleTesterSubclass();
+
+            ruleTesterSubclass.run("this-is-a-rule-name", require("../../fixtures/testers/rule-tester/no-var"), {
+                valid: [
+                    "valid(code);",
+                    {
+                        code: "validOnly(code);",
+                        only: true
+                    }
+                ],
+                invalid: []
+            });
+
+            return Promise.all([
+                assertionDescribe,
+                assertionIt,
+                assertionItOnly
+            ]);
+        });
+
+    });
+
 });
diff --git a/tests/lib/rule-tester/rule-tester.js b/tests/lib/rule-tester/rule-tester.js
index 39ebddcfd06..ae5bee314c1 100644
--- a/tests/lib/rule-tester/rule-tester.js
+++ b/tests/lib/rule-tester/rule-tester.js
@@ -2628,45 +2628,50 @@ describe("RuleTester", () => {
         });
     });
 
-    it("should allow subclasses to set the describe/it/itOnly statics and should correctly use those values", () => {
-        const assertionDescribe = assertEmitted(ruleTesterTestEmitter, "custom describe", "this-is-a-rule-name");
-        const assertionIt = assertEmitted(ruleTesterTestEmitter, "custom it", "valid(code);");
-        const assertionItOnly = assertEmitted(ruleTesterTestEmitter, "custom itOnly", "validOnly(code);");
+    describe("Subclassing", () => {
+
+        it("should allow subclasses to set the describe/it/itOnly statics and should correctly use those values", () => {
+            const assertionDescribe = assertEmitted(ruleTesterTestEmitter, "custom describe", "this-is-a-rule-name");
+            const assertionIt = assertEmitted(ruleTesterTestEmitter, "custom it", "valid(code);");
+            const assertionItOnly = assertEmitted(ruleTesterTestEmitter, "custom itOnly", "validOnly(code);");
+
+            /**
+             * Subclass for testing
+             */
+            class RuleTesterSubclass extends RuleTester { }
+            RuleTesterSubclass.describe = function(text, method) {
+                ruleTesterTestEmitter.emit("custom describe", text, method);
+                return method.call(this);
+            };
+            RuleTesterSubclass.it = function(text, method) {
+                ruleTesterTestEmitter.emit("custom it", text, method);
+                return method.call(this);
+            };
+            RuleTesterSubclass.itOnly = function(text, method) {
+                ruleTesterTestEmitter.emit("custom itOnly", text, method);
+                return method.call(this);
+            };
 
-        /**
-         * Subclass for testing
-         */
-        class RuleTesterSubclass extends RuleTester { }
-        RuleTesterSubclass.describe = function(text, method) {
-            ruleTesterTestEmitter.emit("custom describe", text, method);
-            return method.call(this);
-        };
-        RuleTesterSubclass.it = function(text, method) {
-            ruleTesterTestEmitter.emit("custom it", text, method);
-            return method.call(this);
-        };
-        RuleTesterSubclass.itOnly = function(text, method) {
-            ruleTesterTestEmitter.emit("custom itOnly", text, method);
-            return method.call(this);
-        };
+            const ruleTesterSubclass = new RuleTesterSubclass();
 
-        const ruleTesterSubclass = new RuleTesterSubclass();
+            ruleTesterSubclass.run("this-is-a-rule-name", require("../../fixtures/testers/rule-tester/no-var"), {
+                valid: [
+                    "valid(code);",
+                    {
+                        code: "validOnly(code);",
+                        only: true
+                    }
+                ],
+                invalid: []
+            });
 
-        ruleTesterSubclass.run("this-is-a-rule-name", require("../../fixtures/testers/rule-tester/no-var"), {
-            valid: [
-                "valid(code);",
-                {
-                    code: "validOnly(code);",
-                    only: true
-                }
-            ],
-            invalid: []
+            return Promise.all([
+                assertionDescribe,
+                assertionIt,
+                assertionItOnly
+            ]);
         });
 
-        return Promise.all([
-            assertionDescribe,
-            assertionIt,
-            assertionItOnly
-        ]);
     });
+
 });