diff --git a/Tests/GNSSCodesTests/GNSSCodesTests.swift b/Tests/GNSSCodesTests/GNSSCodesTests.swift
index e489eda..6223683 100644
--- a/Tests/GNSSCodesTests/GNSSCodesTests.swift
+++ b/Tests/GNSSCodesTests/GNSSCodesTests.swift
@@ -48,3 +48,9 @@ import Testing
     #expect(code != nil)
     #expect(code?.chips.count == 20460) // BOC(1,1) of 10230 is 20460
 }
+
+@Test func testL1CP_PRN1() {
+    let code = GNSSCodes.generate(prn: 1, type: .L1CP)
+    #expect(code != nil)
+    #expect(code?.chips.count == 20460) // BOC(1,1) of 10230 is 20460
+}