diff --git a/.github/workflows/default.yml b/.github/workflows/default.yml
index 8c18957d..a7b7f97d 100644
--- a/.github/workflows/default.yml
+++ b/.github/workflows/default.yml
@@ -72,8 +72,8 @@ jobs:
 
       - name: Assert fixes
         run: |
-          cd test-project/build/reports/ktlint
-          grep 'no-empty-class-body' main-format.txt | grep -q 'EmptyClassBodyClass.kt:3:27'
+          cd test-project/service/build/reports/ktlint
+          grep 'kotlinter-test-rules:no-var' main-lint.txt | grep -q 'CustomNoVar.kt:4:5'
           grep 'op-spacing' test-format.txt | grep -q 'OpSpacing.kt:5:16'
 
       - name: Upload reports
diff --git a/test-project/build.gradle.kts b/test-project/build.gradle.kts
index d5fbdfd6..2682285e 100644
--- a/test-project/build.gradle.kts
+++ b/test-project/build.gradle.kts
@@ -1,4 +1,3 @@
 plugins {
-    kotlin("jvm") version "2.1.0"
-    id("org.jmailen.kotlinter")
+    kotlin("jvm") version "2.1.0" apply false
 }
diff --git a/test-project/rules/build.gradle.kts b/test-project/rules/build.gradle.kts
new file mode 100644
index 00000000..4f6f62dd
--- /dev/null
+++ b/test-project/rules/build.gradle.kts
@@ -0,0 +1,7 @@
+plugins {
+    kotlin("jvm")
+}
+
+dependencies {
+    compileOnly("com.pinterest.ktlint:ktlint-cli-ruleset-core:1.5.0")
+}
diff --git a/test-project/rules/src/main/kotlin/org/jmailen/ktlint/rule/NoVarRule.kt b/test-project/rules/src/main/kotlin/org/jmailen/ktlint/rule/NoVarRule.kt
new file mode 100644
index 00000000..937951e9
--- /dev/null
+++ b/test-project/rules/src/main/kotlin/org/jmailen/ktlint/rule/NoVarRule.kt
@@ -0,0 +1,23 @@
+package org.jmailen.ktlint.rule
+
+import com.pinterest.ktlint.rule.engine.core.api.*
+import org.jetbrains.kotlin.com.intellij.lang.ASTNode
+
+class NoVarRule :
+    Rule(
+        ruleId = RuleId("$CUSTOM_RULE_SET_ID:no-var"),
+        about = About(
+            maintainer = "jmailen",
+            repositoryUrl = "https://gtihub.com/jeremymailen/kotlinter-gradle"
+        )
+    ),
+    RuleAutocorrectApproveHandler {
+    override fun beforeVisitChildNodes(
+        node: ASTNode,
+        emit: (offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> AutocorrectDecision
+    ) {
+        if (node.elementType == ElementType.VAR_KEYWORD) {
+            emit(node.startOffset, "Use val instead of var", false)
+        }
+    }
+}
diff --git a/test-project/rules/src/main/kotlin/org/jmailen/ktlint/rule/RuleSetProvider.kt b/test-project/rules/src/main/kotlin/org/jmailen/ktlint/rule/RuleSetProvider.kt
new file mode 100644
index 00000000..f698e7e3
--- /dev/null
+++ b/test-project/rules/src/main/kotlin/org/jmailen/ktlint/rule/RuleSetProvider.kt
@@ -0,0 +1,16 @@
+package org.jmailen.ktlint.rule
+
+import com.pinterest.ktlint.cli.ruleset.core.api.RuleSetProviderV3
+import com.pinterest.ktlint.rule.engine.core.api.RuleProvider
+import com.pinterest.ktlint.rule.engine.core.api.RuleSetId
+
+internal val CUSTOM_RULE_SET_ID = "kotlinter-test-rules"
+
+class CustomRuleSetProvider : RuleSetProviderV3(RuleSetId(CUSTOM_RULE_SET_ID)) {
+    override fun getRuleProviders(): Set<RuleProvider> =
+        setOf(
+            RuleProvider {
+                NoVarRule()
+            },
+        )
+}
diff --git a/test-project/rules/src/main/resources/META-INF/services/com.pinterest.ktlint.cli.ruleset.core.api.RuleSetProviderV3 b/test-project/rules/src/main/resources/META-INF/services/com.pinterest.ktlint.cli.ruleset.core.api.RuleSetProviderV3
new file mode 100644
index 00000000..683baa14
--- /dev/null
+++ b/test-project/rules/src/main/resources/META-INF/services/com.pinterest.ktlint.cli.ruleset.core.api.RuleSetProviderV3
@@ -0,0 +1 @@
+org.jmailen.ktlint.rule.CustomRuleSetProvider
diff --git a/test-project/service/build.gradle.kts b/test-project/service/build.gradle.kts
new file mode 100644
index 00000000..f01fc325
--- /dev/null
+++ b/test-project/service/build.gradle.kts
@@ -0,0 +1,13 @@
+plugins {
+    kotlin("jvm")
+    id("org.jmailen.kotlinter")
+}
+
+dependencies {
+    ktlint(project(":rules"))
+}
+
+kotlinter {
+    reporters = arrayOf("plain", "checkstyle")
+    ignoreLintFailures = true
+}
diff --git a/test-project/service/src/main/kotlin/org/jmailen/gradle/kotlinter/sample/CustomNoVar.kt b/test-project/service/src/main/kotlin/org/jmailen/gradle/kotlinter/sample/CustomNoVar.kt
new file mode 100644
index 00000000..5952ecef
--- /dev/null
+++ b/test-project/service/src/main/kotlin/org/jmailen/gradle/kotlinter/sample/CustomNoVar.kt
@@ -0,0 +1,5 @@
+package org.jmailen.gradle.kotlinter.sample
+
+class CustomNoVar {
+    var test: String = "test"
+}
diff --git a/test-project/src/test/kotlin/org/jmailen/gradle/kotlinter/sample/OpSpacing.kt b/test-project/service/src/test/kotlin/org/jmailen/gradle/kotlinter/sample/OpSpacing.kt
similarity index 100%
rename from test-project/src/test/kotlin/org/jmailen/gradle/kotlinter/sample/OpSpacing.kt
rename to test-project/service/src/test/kotlin/org/jmailen/gradle/kotlinter/sample/OpSpacing.kt
diff --git a/test-project/settings.gradle.kts b/test-project/settings.gradle.kts
index e8bbe0f0..c5f7e923 100644
--- a/test-project/settings.gradle.kts
+++ b/test-project/settings.gradle.kts
@@ -10,3 +10,6 @@ dependencyResolutionManagement {
 plugins {
     id("org.gradle.toolchains.foojay-resolver-convention") version "0.7.0"
 }
+
+include(":service")
+include(":rules")
diff --git a/test-project/src/main/kotlin/org/jmailen/gradle/kotlinter/sample/EmptyClassBodyClass.kt b/test-project/src/main/kotlin/org/jmailen/gradle/kotlinter/sample/EmptyClassBodyClass.kt
deleted file mode 100644
index cc7fbd3b..00000000
--- a/test-project/src/main/kotlin/org/jmailen/gradle/kotlinter/sample/EmptyClassBodyClass.kt
+++ /dev/null
@@ -1,4 +0,0 @@
-package org.jmailen.gradle.kotlinter.sample
-
-class EmptyClassBodyClass {
-}