diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bd2ddd8..fc0d2fe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -50,8 +50,6 @@ jobs:
 
       - run: npm ci --ignore-scripts
 
-      - run: npm ci --ignore-scripts
-
       - run: npm run build
   test:
     needs: build
diff --git a/.gitignore b/.gitignore
index 78dc869..3455d50 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,7 @@
 .vscode/settings.json
 coverage
 /commonjs/
-lib
+/lib/
 node_modules
 *.log
 
diff --git a/test/lib/compareVectors.ts b/test/lib/compareVectors.ts
new file mode 100644
index 0000000..09d3c22
--- /dev/null
+++ b/test/lib/compareVectors.ts
@@ -0,0 +1,17 @@
+/**
+ * Helper from satellite.js to compare vectors
+ */
+
+import { Vec3 } from 'lib/ootk-core';
+
+export const compareVectors = (vector1: Vec3, vector2: Vec3, numDigits: number) => {
+  if (!numDigits) {
+    expect(vector1.x).toEqual(vector2.x);
+    expect(vector1.y).toEqual(vector2.y);
+    expect(vector1.z).toEqual(vector2.z);
+  } else {
+    expect(vector1.x).toBeCloseTo(vector2.x, numDigits);
+    expect(vector1.y).toBeCloseTo(vector2.y, numDigits);
+    expect(vector1.z).toBeCloseTo(vector2.z, numDigits);
+  }
+};
diff --git a/test/sun-moon/sun-moon.test.ts b/test/sun-moon/sun-moon.test.ts
index 0609566..f55315e 100644
--- a/test/sun-moon/sun-moon.test.ts
+++ b/test/sun-moon/sun-moon.test.ts
@@ -37,6 +37,9 @@ describe('Sun and Moon', () => {
   });
 
   test('getMoonIllumination returns fraction and angle of moons illuminated limb and phase', () => {
+    // eslint-disable-next-line no-console
+    console.log('dateObj', dateObj);
+
     const moonIllum = Moon.getMoonIllumination(dateObj);
 
     expect(moonIllum).toMatchSnapshot();