diff --git a/.gitignore b/.gitignore
index 55e6dfc03f..48d035ac4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -111,4 +111,7 @@ gradle-app.setting
 .gradletasknamecache
 
 # # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
-# gradle/wrapper/gradle-wrapper.properties
\ No newline at end of file
+# gradle/wrapper/gradle-wrapper.properties
+
+# Potentially copyrighted test APK
+stock.apk
\ No newline at end of file
diff --git a/src/test/kotlin/app/revanced/patches/SignatureChecker.kt b/src/test/kotlin/app/revanced/patches/SignatureChecker.kt
new file mode 100644
index 0000000000..28cc27d67f
--- /dev/null
+++ b/src/test/kotlin/app/revanced/patches/SignatureChecker.kt
@@ -0,0 +1,39 @@
+package app.revanced.patches
+
+import app.revanced.patcher.Patcher
+import app.revanced.patcher.signature.MethodSignature
+import app.revanced.patcher.signature.PatternScanMethod
+import org.junit.Test
+import java.io.File
+
+internal class SignatureChecker {
+    @Test
+    fun checkSignatures() {
+        val file = File("stock.apk")
+        if (!file.exists()) {
+            throw IllegalStateException("Missing stock.apk! To run this test, please place stock.apk here: ${file.absolutePath}")
+        }
+        val patcher = Patcher(file)
+        patcher.addPatches(Index.patches.map { it() })
+        val unresolved = mutableListOf<MethodSignature>()
+        for (signature in patcher.resolveSignatures()) {
+            if (!signature.resolved) unresolved.add(signature)
+
+            val patternScanMethod = signature.metadata.patternScanMethod
+            if (patternScanMethod is PatternScanMethod.Fuzzy) {
+                val warnings = patternScanMethod.warnings
+                println("Signature ${signature.metadata.name} had ${warnings.size} warnings!")
+                for (warning in warnings) {
+                    println(warning.toString())
+                }
+            }
+        }
+        if (unresolved.isNotEmpty()) {
+            val base = Exception("${unresolved.size} signatures were not resolved.")
+            for (signature in unresolved) {
+                base.addSuppressed(Exception("Signature ${signature.metadata.name} was not resolved!"))
+            }
+            throw base
+        }
+    }
+}
\ No newline at end of file