diff --git a/src/test/java/quality/SmokeMethodTestHarness.java b/src/test/java/quality/SmokeMethodTestHarness.java
index 0b931ef..61d420d 100644
--- a/src/test/java/quality/SmokeMethodTestHarness.java
+++ b/src/test/java/quality/SmokeMethodTestHarness.java
@@ -58,7 +58,7 @@ public static void verify(Class<?> clazz) {
         }
 
         String summary = String.format("%s attempted=%d failed=%d", clazz.getSimpleName(), attempted, failed);
-        Assertions.assertTrue(failed < attempted, () -> "Every executable smoke path failed: " + summary);
+        Assertions.assertEquals(0, failed, () -> "Executable smoke path failed: " + summary);
     }
 
     private static Object resolveTargetInstance(Method method, Class<?> clazz) throws Exception {
diff --git a/src/test/java/quality/SmokeMethodTestHarnessTest.java b/src/test/java/quality/SmokeMethodTestHarnessTest.java
index 8fef2ae..8187185 100644
--- a/src/test/java/quality/SmokeMethodTestHarnessTest.java
+++ b/src/test/java/quality/SmokeMethodTestHarnessTest.java
@@ -1,6 +1,5 @@
 package quality;
 
-import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import org.junit.jupiter.api.Test;
@@ -13,8 +12,8 @@ void rejectsClassesWhoseEveryExecutablePathFails() {
     }
 
     @Test
-    void acceptsAClassWhenAtLeastOneExecutablePathSucceeds() {
-        assertDoesNotThrow(() -> SmokeMethodTestHarness.verify(PartiallyWorks.class));
+    void rejectsAClassWhenAnyExecutablePathFails() {
+        assertThrows(AssertionError.class, () -> SmokeMethodTestHarness.verify(PartiallyWorks.class));
     }
 
     private static final class AlwaysFails {