diff --git a/test/placing.test.js b/test/placing.test.js
index 1500174..c127641 100644
--- a/test/placing.test.js
+++ b/test/placing.test.js
@@ -397,9 +397,27 @@ describe('compute', () => {
   };
 
   test('no nodes', () => {
-    const nodes = placing({diagonals: false}).compute({}, []);
+    const nodes = placing().compute({}, []);
     expect(nodes).toEqual({});
   });
+  test('invalid node', () => {
+    try {
+      placing().compute({
+        'a': {name: 'a', x: 'hello'}
+      }, []);
+      fail('no error thrown');
+    } catch (err) {
+      expect(err).toBe('node \'a\' is invalid at key x');
+    }
+  });
+  test('invalid link', () => {
+    try {
+      placing().compute({}, [{from: 'a', to: 5}]);
+      fail('no error thrown');
+    } catch (err) {
+      expect(err).toBe('link 0 (a->5) is invalid at key to');
+    }
+  });
   test('3 nodes no link', () => {
     const nodes = placing({diagonals: false}).compute(createNodes(3), []);
     expect(nodes).toEqual({
diff --git a/test/rendering.test.js b/test/rendering.test.js
index ec920ab..828cc25 100644
--- a/test/rendering.test.js
+++ b/test/rendering.test.js
@@ -124,4 +124,22 @@ describe('compute', () => {
     const res = rendering({beautify: true, 'h-spacing': 1.2, scale: 20}).compute({}, []);
     expect(res).toEqual('<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 0 0" width="0" height="0">\n</svg>');
   });
+  test('invalid node', () => {
+    try {
+      rendering().compute({
+        'a': {name: 'a', icon: 5}
+      }, []);
+      fail('no error thrown');
+    } catch (err) {
+      expect(err).toBe('node \'a\' is invalid at key icon');
+    }
+  });
+  test('invalid link', () => {
+    try {
+      rendering().compute({}, [{from: 'a', to: 'b', type: 5}]);
+      fail('no error thrown');
+    } catch (err) {
+      expect(err).toBe('link 0 (a->b) is invalid at key type');
+    }
+  });
 });
\ No newline at end of file