diff --git a/config/detekt/detekt.yml b/config/detekt/detekt.yml
index d7cd09e74..0b8ea81c4 100644
--- a/config/detekt/detekt.yml
+++ b/config/detekt/detekt.yml
@@ -43,6 +43,8 @@ complexity:
     excludes: ['**/test/**', '**/*.Test.kt', '**/*.Spec.kt']
   MethodOverloading:
     active: true
+  TooManyFunctions:
+    excludes: ['**/test/**', '**/functionalTest/**']
 
 coroutines:
   active: true
@@ -129,6 +131,10 @@ naming:
   VariableMinLength:
     active: true
 
+performance:
+  SpreadOperator:
+    excludes: ['**/test/**', '**/functionalTest/**']
+
 potential-bugs:
   AvoidReferentialEquality:
     active: true
diff --git a/detekt-gradle-plugin/build.gradle.kts b/detekt-gradle-plugin/build.gradle.kts
index 483372541..8fe7fe491 100644
--- a/detekt-gradle-plugin/build.gradle.kts
+++ b/detekt-gradle-plugin/build.gradle.kts
@@ -90,10 +90,15 @@ gradlePlugin {
     testSourceSets(
         sourceSets["testFixtures"],
         sourceSets["functionalTest"],
-        sourceSets["test"]
     )
 }
 
+// Some functional tests reference internal functions in the Gradle plugin. This should become unnecessary as further
+// updates are made to the functional test suite.
+kotlin.target.compilations.getByName("functionalTest") {
+    associateWith(target.compilations.getByName("main"))
+}
+
 // Manually inject dependency to gradle-testkit since the default injected plugin classpath is from `main.runtime`.
 tasks.pluginUnderTestMetadata {
     pluginClasspath.from(pluginCompileOnly)
diff --git a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/ConfigurationCacheSpec.kt b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/ConfigurationCacheSpec.kt
similarity index 100%
rename from detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/ConfigurationCacheSpec.kt
rename to detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/ConfigurationCacheSpec.kt
diff --git a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektAndroidSpec.kt b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektAndroidSpec.kt
similarity index 100%
rename from detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektAndroidSpec.kt
rename to detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektAndroidSpec.kt
diff --git a/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektJvmSpec.kt b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektJvmSpec.kt
new file mode 100644
index 000000000..326a73144
--- /dev/null
+++ b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektJvmSpec.kt
@@ -0,0 +1,89 @@
+package io.gitlab.arturbosch.detekt
+
+import io.gitlab.arturbosch.detekt.testkit.DslGradleRunner
+import io.gitlab.arturbosch.detekt.testkit.ProjectLayout
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Nested
+import org.junit.jupiter.api.Test
+
+class DetektJvmSpec {
+    @Nested
+    inner class `When applying detekt in a JVM project` {
+
+        @Nested
+        inner class `report location set on extension & task` {
+            val gradleRunner = DslGradleRunner(
+                projectLayout = ProjectLayout(numberOfSourceFilesInRootPerSourceDir = 1),
+                buildFileName = "build.gradle.kts",
+                mainBuildFileContent = """
+                    plugins {
+                        kotlin("jvm")
+                        id("io.gitlab.arturbosch.detekt")
+                    }
+
+                    repositories {
+                        mavenCentral()
+                        mavenLocal()
+                    }
+
+                    detekt {
+                        reports {
+                            txt.destination = file("output-path.txt")
+                        }
+                    }
+
+                    tasks.withType<io.gitlab.arturbosch.detekt.Detekt>().configureEach {
+                        reports {
+                            txt.destination = file("output-path2.txt")
+                        }
+                    }
+                """.trimIndent(),
+                dryRun = false
+            ).also {
+                it.setupProject()
+            }
+
+            @Test
+            fun `logs a warning`() {
+                gradleRunner.runTasksAndCheckResult(":detektMain") { buildResult ->
+                    assertThat(buildResult.output).contains("TXT report location set on detekt {} extension will be ignored for detektMain task.")
+                }
+            }
+        }
+
+        @Nested
+        inner class `report location set on task only` {
+            val gradleRunner = DslGradleRunner(
+                projectLayout = ProjectLayout(numberOfSourceFilesInRootPerSourceDir = 1),
+                buildFileName = "build.gradle.kts",
+                mainBuildFileContent = """
+                    plugins {
+                        kotlin("jvm")
+                        id("io.gitlab.arturbosch.detekt")
+                    }
+
+                    repositories {
+                        mavenCentral()
+                        mavenLocal()
+                    }
+
+                    tasks.withType<io.gitlab.arturbosch.detekt.Detekt>().configureEach {
+                        reports {
+                            txt.destination = file("output-path2.txt")
+                        }
+                    }
+                """.trimIndent(),
+                dryRun = false
+            ).also {
+                it.setupProject()
+            }
+
+            @Test
+            fun `logs a warning`() {
+                gradleRunner.runTasksAndCheckResult(":detektMain") { buildResult ->
+                    assertThat(buildResult.output).doesNotContain("report location set on detekt {} extension will be ignored")
+                }
+            }
+        }
+    }
+}
diff --git a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektMultiplatformSpec.kt b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektMultiplatformSpec.kt
similarity index 100%
rename from detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektMultiplatformSpec.kt
rename to detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektMultiplatformSpec.kt
diff --git a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektPlainSpec.kt b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektPlainSpec.kt
similarity index 100%
rename from detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektPlainSpec.kt
rename to detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektPlainSpec.kt
diff --git a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektTaskDslSpec.kt b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektTaskDslSpec.kt
similarity index 100%
rename from detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektTaskDslSpec.kt
rename to detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/DetektTaskDslSpec.kt
diff --git a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/GradleVersionSpec.kt b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/GradleVersionSpec.kt
similarity index 100%
rename from detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/GradleVersionSpec.kt
rename to detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/GradleVersionSpec.kt
diff --git a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/report/ReportMergeSpec.kt b/detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/report/ReportMergeSpec.kt
similarity index 100%
rename from detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/report/ReportMergeSpec.kt
rename to detekt-gradle-plugin/src/functionalTest/kotlin/io/gitlab/arturbosch/detekt/report/ReportMergeSpec.kt
diff --git a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektJvmSpec.kt b/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektJvmSpec.kt
index 8d15e9bb7..ed102f50c 100644
--- a/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektJvmSpec.kt
+++ b/detekt-gradle-plugin/src/test/kotlin/io/gitlab/arturbosch/detekt/DetektJvmSpec.kt
@@ -64,81 +64,5 @@ class DetektJvmSpec {
                 assertThat(argumentString).contains("--classpath")
             }
         }
-
-        @Nested
-        inner class `report location set on extension & task` {
-            val gradleRunner = DslGradleRunner(
-                projectLayout = ProjectLayout(numberOfSourceFilesInRootPerSourceDir = 1),
-                buildFileName = "build.gradle.kts",
-                mainBuildFileContent = """
-                    plugins {
-                        kotlin("jvm")
-                        id("io.gitlab.arturbosch.detekt")
-                    }
-
-                    repositories {
-                        mavenCentral()
-                        mavenLocal()
-                    }
-
-                    detekt {
-                        reports {
-                            txt.destination = file("output-path.txt")
-                        }
-                    }
-
-                    tasks.withType<io.gitlab.arturbosch.detekt.Detekt>().configureEach {
-                        reports {
-                            txt.destination = file("output-path2.txt")
-                        }
-                    }
-                """.trimIndent(),
-                dryRun = false
-            ).also {
-                it.setupProject()
-            }
-
-            @Test
-            fun `logs a warning`() {
-                gradleRunner.runTasksAndCheckResult(":detektMain") { buildResult ->
-                    assertThat(buildResult.output).contains("TXT report location set on detekt {} extension will be ignored for detektMain task.")
-                }
-            }
-        }
-
-        @Nested
-        inner class `report location set on task only` {
-            val gradleRunner = DslGradleRunner(
-                projectLayout = ProjectLayout(numberOfSourceFilesInRootPerSourceDir = 1),
-                buildFileName = "build.gradle.kts",
-                mainBuildFileContent = """
-                    plugins {
-                        kotlin("jvm")
-                        id("io.gitlab.arturbosch.detekt")
-                    }
-
-                    repositories {
-                        mavenCentral()
-                        mavenLocal()
-                    }
-
-                    tasks.withType<io.gitlab.arturbosch.detekt.Detekt>().configureEach {
-                        reports {
-                            txt.destination = file("output-path2.txt")
-                        }
-                    }
-                """.trimIndent(),
-                dryRun = false
-            ).also {
-                it.setupProject()
-            }
-
-            @Test
-            fun `logs a warning`() {
-                gradleRunner.runTasksAndCheckResult(":detektMain") { buildResult ->
-                    assertThat(buildResult.output).doesNotContain("report location set on detekt {} extension will be ignored")
-                }
-            }
-        }
     }
 }