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diff --git a/prime?/prime-test.scm b/prime?/prime-test.scm
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+++ b/prime?/prime-test.scm
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+;; -*- compile-command: "guile -L . prime-test.scm"; -*-
+(use-modules (srfi srfi-64)
+             (prime))
+
+(test-begin "harness")
+
+
+(test-assert "test-not-prime-0"
+  (not (prime? 12)))
+
+(test-assert "test-not-prime-1"
+  (not (prime? 21)))
+
+(test-assert "test-prime"
+  (prime? 13))
+
+(test-assert "test-prime-large"
+  (prime? 1000033))
+
+(test-assert "test-two"
+  (prime? 2))
+
+;; one is NOT considered prime!
+(test-assert "test-one"
+  (not (prime? 1)))
+
+;; zero is NOT considered prime!
+(test-assert "test-zero"
+  (not (prime? 0)))
+
+(test-assert "test-negative"
+  (not (prime? -13)))
+
+
+(test-end "harness")