Add ability to check if a HealthCheck.Result is healthy using a boole…

…an (#498)

* Add hasHealthyValue(boolean) to HealthCheckResultAssertions

Closes #494

src/main/java/org/kiwiproject/test/assertj/dropwizard/metrics/HealthCheckResultAssertions.java

@@ -112,6 +112,20 @@ public HealthCheckResultAssertions isUnhealthy() {
         return this;
     }
 
+    /**
+     * Asserts the health check result returns the given boolean value from {@link HealthCheck.Result#isHealthy}.
+     *
+     * @param value the expected value
+     * @return this instance
+     */
+    public HealthCheckResultAssertions hasHealthyValue(boolean value) {
+        Assertions.assertThat(result.isHealthy())
+                .describedAs("Expected result to return %b from isHealthy", value)
+                .isEqualTo(value);
+
+        return this;
+    }
+
     /**
      * Asserts the health check result has the given message.
      *

src/test/java/org/kiwiproject/test/assertj/dropwizard/metrics/HealthCheckResultAssertionsTest.java

@@ -121,6 +121,29 @@ void shouldFail_WhenHealthy() {
         }
     }
 
+    @Nested
+    class HasHealthyValue {
+
+        @ParameterizedTest
+        @ValueSource(booleans = { true, false })
+        void shouldPass_WhenReturnsExpectedValue(boolean healthy) {
+            var healthCheck = MockHealthCheck.builder().healthy(healthy).build();
+
+            assertThatCode(() -> assertThat(healthCheck).hasHealthyValue(healthy))
+                    .doesNotThrowAnyException();
+        }
+
+        @ParameterizedTest
+        @ValueSource(booleans = { true, false })
+        void shouldFail_WhenDoesNotReturnExpectedValue(boolean healthy) {
+            var healthCheck = MockHealthCheck.builder().healthy(!healthy).build();
+
+            assertThatThrownBy(() -> assertThat(healthCheck).hasHealthyValue(healthy))
+                    .isNotNull()
+                    .hasMessageContaining("Expected result to return %b from isHealthy", healthy);
+        }
+    }
+
     @Nested
     class HasMessageMethods {