diff --git a/Tests/ManglingTests/MangledStrings.swift b/Tests/ManglingTests/MangledStrings.swift
new file mode 100644
index 000000000..795c4a4da
--- /dev/null
+++ b/Tests/ManglingTests/MangledStrings.swift
@@ -0,0 +1,10 @@
+extension ManglingTests {
+
+  static let inputCase =
+    "mFxF0R0UfDynamicBufferA10sF06init1lTR736selfpT2bTa" +
+    "TK1Z2gTK1G8HeadergTK1G9ElementacapacitypT1aTR2Zqin" +
+    "itializing_header_withpT1lTgTrKG3E10pT2K4R7R7YVQOu" +
+    ".fZlTtT112lTtT215rT1K9dinit_headerrT1Ke10pT2tT215K" +
+    "9gpayload_headerK4R70R72K9tT13cKj"
+
+}
diff --git a/Tests/ManglingTests/ManglingTests.swift b/Tests/ManglingTests/ManglingTests.swift
index b39603cdc..25cbaa37f 100644
--- a/Tests/ManglingTests/ManglingTests.swift
+++ b/Tests/ManglingTests/ManglingTests.swift
@@ -119,13 +119,7 @@ final class ManglingTests: XCTestCase {
   }
 
   func testMonomorphized() {
-    let m =
-      "mFxF0R0UfDynamicBufferA10sF06init1lTR736selfpT2bTa" +
-      "TK1Z2gTK1G8HeadergTK1G9ElementacapacitypT1aTR2Zqin" +
-      "itializing_header_withpT1lTgTrKG3E10pT2K4R7R7YVQOu" +
-      ".fZlTtT112lTtT215rT1K9dinit_headerrT1Ke10pT2tT215K" +
-      "9gpayload_headerK4R70R72K9tT13cKj"
-    XCTAssertNotNil(DemangledSymbol(m))
+    XCTAssertNotNil(DemangledSymbol(Self.inputCase))
   }
 
 }