diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..2e02949
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,31 @@
+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Testing CI
+
+on:
+  push:
+    branches: [ "dev", "main" ]
+  pull_request:
+    branches: [ "dev", "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [16.x]
+        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+    - run: npm install
+    - run: npm run test:unit
+
diff --git a/src/helpers/filters.ts b/src/helpers/filters.ts
index 8894e81..e83f726 100644
--- a/src/helpers/filters.ts
+++ b/src/helpers/filters.ts
@@ -1,23 +1,42 @@
-import { getAvgRating } from '$helpers';
-import type { Product, Tag } from '$types';
+import { avgRating } from '$helpers';
+import type { FullProduct, Tag } from '$types';
+
+export type TagArgs = {
+	value: string;
+	$tags: Tag[];
+};
+
+export type RatingArgs = {
+	value: string | number;
+};
 
 /** Default value for filter selectors, saved in store */
 export const defaultFilter = { selectedCat: 0, selectedRating: 0 };
 
-/** Filters products by matching tags according to passed value */
-export const filterByCat = (products: Product[], value: string, tags: Tag[]): Product[] =>
+/** Rating greater than what is passed in */
+export const _ratingHigher = (product: FullProduct, { value }: RatingArgs) =>
+	product.rating && avgRating(product.rating) >= Number(value);
+
+/** Matches tags according to passed value */
+export const _matchesTag = (product: FullProduct, { value, $tags }: TagArgs): boolean => {
+	try {
+		if (product.tags) {
+			const selectedTagId = $tags.find((tag) => tag.name === value)._id;
+			const productTags = product.tags.map((tag) => tag._ref);
+			if (productTags.includes(selectedTagId)) return true;
+		} else return false;
+	} catch {
+		return true;
+	}
+};
+
+/** Filters products */
+export const filterProductsBy = (type: string, products: FullProduct[], config) =>
 	products.filter((product) => {
-		try {
-			if (product.tags) {
-				const selectedTagId = tags.find((tag) => tag.name === value)._id;
-				const productTags = product.tags.map((tag) => tag._ref);
-				if (productTags.includes(selectedTagId)) return true;
-			} else return false;
-		} catch {
-			return true;
+		switch (type) {
+			case 'tag':
+				return _matchesTag(product, config);
+			case 'rating':
+				return _ratingHigher(product, config);
 		}
 	});
-
-/** Filters by rating greater than what is passed in */
-export const filterByRating = (products: Product[], value: string | number) =>
-	products.filter((product) => product.rating && getAvgRating(product.rating) >= Number(value));
diff --git a/src/helpers/index.ts b/src/helpers/index.ts
index 4f23bb4..c42af27 100644
--- a/src/helpers/index.ts
+++ b/src/helpers/index.ts
@@ -1,5 +1,5 @@
 export * from './toProduct';
-export * from './parse';
-export * from './getAvgRating';
+export * from './utils/parse';
+export * from './utils/avgRating';
 export * from './param';
-export * from './filters'
\ No newline at end of file
+export * from './filters';
diff --git a/src/helpers/tests/filters.test.ts b/src/helpers/tests/filters.test.ts
index b582ac4..5f2e391 100644
--- a/src/helpers/tests/filters.test.ts
+++ b/src/helpers/tests/filters.test.ts
@@ -1,22 +1,26 @@
-import { filterByCat, filterByRating } from '$helpers';
+import { filterProductsBy } from '$helpers';
 import { describe, expect, test } from 'vitest';
 import { testProducts, testTags } from './data';
 
-describe('filterByCat', () => {
+describe('filterProducts', () => {
 	test('filters products by passed category tag', () => {
-		expect(filterByCat(testProducts, 'Exercise', testTags)).toHaveLength(1);
-		expect(filterByCat(testProducts, 'Electronics', testTags)).toHaveLength(1);
+		expect(
+			filterProductsBy('tag', testProducts, { value: 'Exercise', $tags: testTags })
+		).toHaveLength(1);
+		expect(
+			filterProductsBy('tag', testProducts, { value: 'Electronics', $tags: testTags })
+		).toHaveLength(1);
 	});
 
-	test('returns unchanged products if tag does not exist', () => {
-		expect(filterByCat(testProducts, 'grapes', testTags)).toEqual(testProducts);
-	});
-});
-
-describe('filterByRating', () => {
-	test('filterByRating returns products only greater than # passed in', () => {
-		expect(filterByRating(testProducts, 3)).toHaveLength(3);
-
-		expect(filterByRating(testProducts, 5)).toHaveLength(0);
+	test('filter by tag returns unchanged products if tag does not exist', () => {
+		expect(filterProductsBy('tag', testProducts, { value: 'grapes', $tags: testTags })).toEqual(
+			testProducts
+		);
+	});
+
+	test('filters ratings only greater than # passed in', () => {
+		expect(filterProductsBy('rating', testProducts, { value: 3 })).toHaveLength(3);
+
+		expect(filterProductsBy('rating', testProducts, { value: 5 })).toHaveLength(0);
 	});
 });
diff --git a/src/helpers/tests/getAvgRating.test.ts b/src/helpers/tests/getAvgRating.test.ts
index a05eb7d..8413b08 100644
--- a/src/helpers/tests/getAvgRating.test.ts
+++ b/src/helpers/tests/getAvgRating.test.ts
@@ -1,21 +1,19 @@
-import { getAvgRating } from '$helpers';
+import { avgRating } from '$helpers';
 import { test, expect } from 'vitest';
 import { testRating1, testRating2 } from './data';
 
 test('return false if no parameters are passed', async () => {
-	expect(getAvgRating()).toBeFalsy();
+	expect(avgRating()).toBeFalsy();
 });
 
 test('return false if array with empty object is passed', async () => {
-	expect(getAvgRating([{}])).toBeFalsy();
+	expect(avgRating([{}])).toBeFalsy();
 });
 
 test('return single rating if only one rating is passed', async () => {
-	expect(getAvgRating([testRating1])).toBe(testRating1.rating);
+	expect(avgRating([testRating1])).toBe(testRating1.rating);
 });
 
 test('return average of 2 ratings passed', async () => {
-	expect(getAvgRating([testRating1, testRating2])).toBe(
-		(testRating1.rating + testRating2.rating) / 2
-	);
+	expect(avgRating([testRating1, testRating2])).toBe((testRating1.rating + testRating2.rating) / 2);
 });
diff --git a/src/helpers/getAvgRating.ts b/src/helpers/utils/avgRating.ts
similarity index 80%
rename from src/helpers/getAvgRating.ts
rename to src/helpers/utils/avgRating.ts
index 83ea8f7..8f68808 100644
--- a/src/helpers/getAvgRating.ts
+++ b/src/helpers/utils/avgRating.ts
@@ -1,7 +1,7 @@
 import type { Rating } from '$types';
 
 /** Average of all ratings of a product */
-export const getAvgRating = (ratings: Rating[]): number => {
+export const avgRating = (ratings: Rating[]): number => {
 	if (!ratings) return 0;
 	if (ratings.length === 1) return ratings[0].rating;
 	else return ratings.reduce((total, curr) => total + curr.rating, 0) / ratings.length;
diff --git a/src/helpers/parse.ts b/src/helpers/utils/parse.ts
similarity index 100%
rename from src/helpers/parse.ts
rename to src/helpers/utils/parse.ts
diff --git a/src/lib/Feature/Feature.svelte b/src/lib/Feature/Feature.svelte
index 9f1c945..4cc2163 100644
--- a/src/lib/Feature/Feature.svelte
+++ b/src/lib/Feature/Feature.svelte
@@ -4,55 +4,42 @@
 	import Rating from './Rating/Rating.svelte';
 	import PrevNext from './PrevNext/PrevNext.svelte';
 	import Tag from './Tag/Tag.svelte';
-
-	const {
-		container,
-		imageView,
-		subname,
-		description,
-		productInfo,
-		date,
-		tags,
-		img,
-		ratings
-	} = {
-		container: 'flex flex-col',
-		imageView: 'flex m-16 gap-12 w-100',
-		productInfo: 'flex flex-col gap-2',
-		subname: '-mb-2 font-light text-sm',
-		description: 'leading-5',
-		date: 'text-xs w-2/3 mt-auto mb-4',
-		tags: 'flex gap-1 mb-1',
-		img: 'p-8 border w-72 h-72 min-w-36 min-h-36  border-black border-2 p-3',
-		ratings: 'w-100'
-	};
 </script>
 
-<div class={container}>
-	<div class={imageView}>
+<div class="flex flex-col">
+	<div class="flex m-16 gap-12 w-full">
 		{#if $currentProduct.image}
-		<img src={urlFor($currentProduct.image).url()} class={img} alt={$currentProduct.name} />
+			<img
+				src={urlFor($currentProduct.image).url()}
+				class="min-w-36 min-h-36 w-72 h-72 border-black border-2 p-3"
+				alt={$currentProduct.name}
+			/>
 		{/if}
-		<div class={productInfo}>
+		<div class="productInfo">
 			{#if $currentProduct.subname}
-				<span class={subname}>{$currentProduct.subname}</span>
+				<span class="subname">{$currentProduct.subname}</span>
 			{/if}
-			<a href={$currentProduct?.url} target="_blank" class={`font-bold text-2xl title ${$currentProduct.url? 'text-sky-600':''}`}>{$currentProduct.name}</a>
+			<a
+				href={$currentProduct?.url}
+				target="_blank"
+				class={`font-bold text-2xl title ${$currentProduct.url ? 'text-sky-600' : ''}`}
+				>{$currentProduct.name}</a
+			>
 			{#if $currentProduct.tags}
-				<div class={tags}>
+				<div class="tags">
 					{#each $currentProduct.tags as tag (tag._ref)}
 						<Tag {tag} />
 					{/each}
 				</div>
 			{/if}
 			{#if $currentProduct.description}
-				<p class={description}>{$currentProduct.description}</p>
+				<p class="description">{$currentProduct.description}</p>
 			{/if}
-			<p class={date}>Created on: {new Date($currentProduct._createdAt)}</p>
+			<p class="date">Created on: {new Date($currentProduct._createdAt)}</p>
 		</div>
 	</div>
 	{#if $currentProduct.rating}
-		<div class={ratings}>
+		<div class="ratings">
 			{#each $currentProduct.rating as rating (rating._key)}
 				<Rating {rating} />
 			{/each}
@@ -61,12 +48,31 @@
 	<PrevNext />
 </div>
 
-<style>
+<style lang="postcss">
+	.productInfo {
+		@apply flex flex-col gap-2;
+	}
+	.subname {
+		@apply -mb-2 font-light text-sm;
+	}
+	.description {
+		@apply leading-5;
+	}
+	.date {
+		@apply text-xs w-2/3 mt-auto mb-4;
+	}
+	.tags {
+		@apply flex gap-1 mb-1;
+	}
+	.ratings {
+		@apply w-full;
+	}
 	img {
 		image-rendering: pixelated;
 	}
-	.title:hover, img:hover{
+	.title:hover,
+	img:hover {
 		background-image: url('dither.gif');
-  background-repeat: repeat;
+		background-repeat: repeat;
 	}
 </style>
diff --git a/src/lib/Feature/Tag/Tag.svelte b/src/lib/Feature/Tag/Tag.svelte
index 11a02c5..be2868e 100644
--- a/src/lib/Feature/Tag/Tag.svelte
+++ b/src/lib/Feature/Tag/Tag.svelte
@@ -1,28 +1,27 @@
 <script>
 	export let tag;
 	import { tags, currentProduct, productsView, products, filters } from '$lib/stores';
-	import { filterByCat, resetParams } from '$helpers';
+	import { filterProductsBy, resetParams } from '$helpers';
 
 	const tagName = $tags.find((dirTag) => dirTag._id === tag._ref).name;
 
 	const filter = () => {
-		const updatedByCat = filterByCat($products, tagName, $tags);
 		currentProduct.set({});
-		productsView.set(updatedByCat);
+		productsView.set(filterProductsBy('tag', $products, { value: tagName, $tags }));
 		filters.set({ ...$filters, selectedCat: tagName });
 		resetParams();
 	};
-
-	const { container } = {
-		container: 'text-sm flex rounded-md pl-2 pr-2 pt-1 pb-1 bg-gray-200'
-	};
 </script>
 
-<button class={container} on:click={filter}>{tagName}</button>
+<button class="container" on:click={filter}>{tagName}</button>
 
-<style>
+<style lang="postcss">
 	button:hover {
 		background-image: url('dither.gif');
 		background-repeat: repeat;
 	}
+
+	.container {
+		@apply text-sm flex rounded-md pl-2 pr-2 pt-1 pb-1 bg-gray-200 w-auto;
+	}
 </style>
diff --git a/src/lib/Layout/Filters.svelte b/src/lib/Layout/Filters.svelte
index f5b555e..fdbaf0e 100644
--- a/src/lib/Layout/Filters.svelte
+++ b/src/lib/Layout/Filters.svelte
@@ -1,48 +1,61 @@
 <script>
 	import { productsView, products, tags, filters } from '$lib/stores';
-	import { normalize, filterByRating, filterByCat } from '$helpers';
+	import { normalize, filterProductsBy } from '$helpers';
 	export let reset;
 	let { selectedCat, selectedRating } = $filters;
 
 	const stars = ['⭐ ⬆', '⭐⭐ ⬆', '⭐⭐⭐ ⬆', '⭐⭐⭐⭐ ⬆', '⭐⭐⭐⭐⭐ ⬆'];
 
+	const filterProducts = (name, otherVal, { rating = '', tag = '', $tags = [] }) => {
+		const { otherValName, filterArgs, otherFilterArgs } =
+			name === 'rating'
+				? {
+						otherValName: 'tag',
+						filterArgs: { value: rating },
+						otherFilterArgs: { value: otherVal, $tags }
+				  }
+				: {
+						otherValName: 'rating',
+						filterArgs: { value: tag, $tags },
+						otherFilterArgs: { value: otherVal }
+				  };
+
+		const filterOne = filterProductsBy(name, $products, filterArgs);
+		const filterBoth = filterProductsBy(otherValName, filterOne, otherFilterArgs);
+
+		return otherVal ? filterBoth : filterOne;
+	};
+
 	const filter = ({ target: { name, value } }) => {
 		if (Number(value) === 0) {
 			reset();
-
 			return;
 		}
 		switch (normalize(name)) {
 			case 'rating':
-				if (selectedCat)
-					productsView.set(filterByCat(filterByRating($products, value), selectedCat, $tags));
-				else productsView.set(filterByRating($products, value));
+				productsView.set(
+					filterProducts(name, selectedCat, { rating: value, tag: selectedCat, $tags })
+				);
 				break;
-			case 'category':
-				if (selectedRating)
-					productsView.set(filterByRating(filterByCat($products, value, $tags), selectedRating));
-				else productsView.set(filterByCat($products, value, $tags));
+			case 'tag':
+				productsView.set(
+					filterProducts(name, selectedRating, { rating: selectedRating, tag: value, $tags })
+				);
 				break;
 		}
 	};
-
-	const { container, filterBar, filterTitle } = {
-		container: 'flex flex-col text-sm h-auto mb-4 mr-6 mt-4',
-		filterBar: 'pl-4 p-2 pr-2  flex justify-between',
-		filterTitle: 'font-bold'
-	};
 </script>
 
-<div class={container}>
-	<div class={filterBar}>
-		<div class={filterTitle}>Filter</div>
+<div class="container">
+	<div class="filterBar">
+		<div class="filterTitle">Filter</div>
 		<button on:click={reset}> ✖️ </button>
 	</div>
 
 	<select
 		on:change={filter}
 		class={`p-1 pl-5  mr-12 w-full focus:outline-none ${$filters.selectedCat ? 'dither' : ''}`}
-		name="category"
+		name="tag"
 		bind:value={$filters.selectedCat}
 	>
 		<option select="selected" value={0}>Category</option>
@@ -64,7 +77,18 @@
 	</select>
 </div>
 
-<style>
+<style lang="postcss">
+	.container {
+		@apply flex flex-col text-sm h-auto mb-4 mr-6 mt-4;
+	}
+
+	.filterBar {
+		@apply pl-4 p-2 pr-2  flex justify-between;
+	}
+
+	.filterTitle {
+		@apply font-bold;
+	}
 	select:hover {
 		background-image: url('dither.gif');
 		background-repeat: repeat;
diff --git a/src/lib/Layout/Sort.svelte b/src/lib/Layout/Sort.svelte
index ebf7dc2..7b3d5dd 100644
--- a/src/lib/Layout/Sort.svelte
+++ b/src/lib/Layout/Sort.svelte
@@ -1,7 +1,7 @@
 <script>
 	import SortOption from './SortOption.svelte';
 	import { productsView } from '$lib/stores';
-	import { normalize, getAvgRating } from '$helpers';
+	import { normalize, avgRating } from '$helpers';
 
 	const sortOptions = ['Rating', 'Name', 'Created'];
 
@@ -10,8 +10,8 @@
 			case 'rating':
 				productsView.set(
 					$productsView.sort((prev, curr) => {
-						if (current) return getAvgRating(prev.rating) < getAvgRating(curr.rating) ? -1 : 1;
-						else return getAvgRating(prev.rating) < getAvgRating(curr.rating) ? 1 : -1;
+						if (current) return avgRating(prev.rating) < avgRating(curr.rating) ? -1 : 1;
+						else return avgRating(prev.rating) < avgRating(curr.rating) ? 1 : -1;
 					})
 				);
 				break;
diff --git a/src/routes/index.svelte b/src/routes/index.svelte
index 0b52257..b9648eb 100644
--- a/src/routes/index.svelte
+++ b/src/routes/index.svelte
@@ -18,20 +18,22 @@
 			load();
 		};
 	}
-
-	const { container } = {
-		container: 'h-screen overflow-auto w-screen'
-	};
 </script>
 
 <svelte:head>
 	<title>Rating Room</title>
 </svelte:head>
 
-<div class={container}>
+<div class="container">
 	{#if Object.keys($currentProduct).length}
 		<Feature />
 	{:else}
 		<Grid products={$productsView} />
 	{/if}
 </div>
+
+<style lang="postcss">
+	.container {
+		@apply h-screen overflow-auto w-screen;
+	}
+</style>
diff --git a/src/types/index.ts b/src/types/index.ts
index 341d475..d9f6c77 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -46,8 +46,23 @@ export interface Product {
 	description: string;
 	image?: Image;
 	name: string;
-	rating?: Ref[] | Rating[];
-	tags?: Ref[] | Tag[];
+	rating?: Ref[];
+	tags?: Ref[];
+	url?: string;
+	subname?: string;
+}
+
+export interface FullProduct {
+	_createdAt: string;
+	_id: string;
+	_rev: string;
+	_type: 'product';
+	_updatedAt: string;
+	description: string;
+	image?: Image;
+	name: string;
+	rating?: Rating[];
+	tags?: Ref[];
 	url?: string;
 	subname?: string;
 }