diff --git a/src/lib.rs b/src/lib.rs
index 1f8dfe5..05bdf7e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -70,6 +70,21 @@ impl Database {
     }
 }
 
+#[cfg(test)]
+mod support {
+    use super::*;
+
+    pub fn compare(db: &Database, output: &str, expected: &str) {
+        assert!(
+            output == expected,
+            "\n\n{}\nGot:  {}\nWant: {}\n\n",
+            &db.schema.sdl(),
+            output,
+            expected
+        );
+    }
+}
+
 #[cfg(test)]
 mod queries {
     use super::*;
@@ -79,6 +94,7 @@ mod queries {
         let db = Database::new();
         let output = db.execute("{pointless}").await;
         let expected = r#"{"data":{"pointless":"this is pointless."}}"#;
+        support::compare(&db, &output, &expected);
         assert!(
             output == expected,
             "Got '{}' instead of '{}'.",
@@ -96,13 +112,7 @@ mod queries {
             .await;
         let output = db.execute(r#"{tables{name}}"#).await;
         let expected = r#"{"data":{"tables":[{"name":"fred"},{"name":"barney"}]}}"#;
-        assert!(
-            output == expected,
-            "\n\n{}\nGot:  {}\nWant: {}\n\n",
-            &db.schema.sdl(),
-            output,
-            expected
-        );
+        support::compare(&db, &output, &expected);
     }
 }
 
@@ -118,11 +128,6 @@ mod mutations {
             .await;
         let expected = r#"{"data":{"createTable":{"name":"william"}}}"#;
         println!("{}", &db.schema.sdl());
-        assert!(
-            output == expected,
-            "Got '{}' instead of '{}'.",
-            output,
-            expected
-        )
+        support::compare(&db, &output, &expected);
     }
 }