diff --git a/package-lock.json b/package-lock.json
index 84724ab..b246822 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,10 +16,9 @@
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@@ -414,6 +413,18 @@
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@@ -512,6 +529,21 @@
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+      "resolved": "https://registry.npmjs.org/@types/chai-subset/-/chai-subset-1.3.3.tgz",
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+      "resolved": "https://registry.npmjs.org/@vitest/runner/-/runner-0.34.3.tgz",
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+        "url": "https://opencollective.com/vitest"
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+    "node_modules/@vitest/snapshot": {
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+      "resolved": "https://registry.npmjs.org/@vitest/snapshot/-/snapshot-0.34.3.tgz",
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+      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-0.34.3.tgz",
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+      "dev": true,
+      "dependencies": {
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+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
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+    "node_modules/@vitest/utils": {
+      "version": "0.34.3",
+      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-0.34.3.tgz",
+      "integrity": "sha512-kiSnzLG6m/tiT0XEl4U2H8JDBjFtwVlaE8I3QfGiMFR0QvnRDfYfdP3YvTBWM/6iJDAyaPY6yVQiCTUc7ZzTHA==",
+      "dev": true,
+      "dependencies": {
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+        "loupe": "^2.3.6",
+        "pretty-format": "^29.5.0"
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+      "funding": {
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@@ -818,6 +924,27 @@
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+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-8.2.0.tgz",
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+      "dev": true,
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+    "node_modules/ansi-styles": {
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+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
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@@ -827,6 +954,15 @@
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@@ -836,6 +972,42 @@
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+      "resolved": "https://registry.npmjs.org/cac/-/cac-6.7.14.tgz",
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+      "dev": true,
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+    "node_modules/chai": {
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+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.3.8.tgz",
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+        "check-error": "^1.0.2",
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+        "loupe": "^2.3.1",
+        "pathval": "^1.1.1",
+        "type-detect": "^4.0.5"
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+    "node_modules/check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
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@@ -990,6 +1162,18 @@
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+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-4.1.3.tgz",
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@@ -1008,6 +1192,15 @@
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+      "resolved": "https://registry.npmjs.org/diff-sequences/-/diff-sequences-29.6.3.tgz",
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@@ -1068,6 +1261,15 @@
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@@ -1077,6 +1279,12 @@
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@@ -1086,12 +1294,33 @@
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+      "dev": true,
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
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+      "resolved": "https://registry.npmjs.org/mlly/-/mlly-1.4.1.tgz",
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+        "pathe": "^1.1.1",
+        "pkg-types": "^1.0.3",
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@@ -1134,6 +1375,36 @@
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@@ -1179,6 +1461,26 @@
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@@ -1195,6 +1497,12 @@
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
+      "integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
+      "dev": true
+    },
     "node_modules/source-map-js": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.2.tgz",
@@ -1204,6 +1512,30 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/stackback": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
+      "integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+      "dev": true
+    },
+    "node_modules/std-env": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-3.4.3.tgz",
+      "integrity": "sha512-f9aPhy8fYBuMN+sNfakZV18U39PbalgjXG3lLB9WkaYTxijru61wb57V9wxxNthXM5Sd88ETBWi29qLAsHO52Q==",
+      "dev": true
+    },
+    "node_modules/strip-literal": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/strip-literal/-/strip-literal-1.3.0.tgz",
+      "integrity": "sha512-PugKzOsyXpArk0yWmUwqOZecSO0GH0bPoctLcqNDH9J04pVW3lflYE0ujElBGTloevcxF5MofAOZ7C5l2b+wLg==",
+      "dev": true,
+      "dependencies": {
+        "acorn": "^8.10.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
     "node_modules/svelte": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/svelte/-/svelte-4.2.0.tgz",
@@ -1228,15 +1560,6 @@
         "node": ">=16"
       }
     },
-    "node_modules/svelte-dnd-action": {
-      "version": "0.9.25",
-      "resolved": "https://registry.npmjs.org/svelte-dnd-action/-/svelte-dnd-action-0.9.25.tgz",
-      "integrity": "sha512-6cW+5b+xYn2w1KaYdzdMiWOn4wzFq9KHpWMyYwixN4M+94RFw9Sn8GiRI0EPFoT5r6/RVD3d3lZ/OjllZlpYbg==",
-      "dev": true,
-      "peerDependencies": {
-        "svelte": ">=3.23.0"
-      }
-    },
     "node_modules/svelte-hmr": {
       "version": "0.15.3",
       "resolved": "https://registry.npmjs.org/svelte-hmr/-/svelte-hmr-0.15.3.tgz",
@@ -1249,15 +1572,45 @@
         "svelte": "^3.19.0 || ^4.0.0"
       }
     },
-    "node_modules/svelvet": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/svelvet/-/svelvet-8.1.0.tgz",
-      "integrity": "sha512-rH67tgb7e2aTBQZBCW+V5hSvulLwvzBiOml9Dzdz2ATkgQr58mHi2WtlQFOOb+eZt6zH/J10a2MataC29Qdpuw==",
+    "node_modules/tinybench": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.5.0.tgz",
+      "integrity": "sha512-kRwSG8Zx4tjF9ZiyH4bhaebu+EDz1BOx9hOigYHlUW4xxI/wKIUQUqo018UlU4ar6ATPBsaMrdbKZ+tmPdohFA==",
+      "dev": true
+    },
+    "node_modules/tinypool": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/tinypool/-/tinypool-0.7.0.tgz",
+      "integrity": "sha512-zSYNUlYSMhJ6Zdou4cJwo/p7w5nmAH17GRfU/ui3ctvjXFErXXkruT4MWW6poDeXgCaIBlGLrfU6TbTXxyGMww==",
       "dev": true,
-      "peerDependencies": {
-        "svelte": ">=3.59.2 || ^4.0.0"
+      "engines": {
+        "node": ">=14.0.0"
       }
     },
+    "node_modules/tinyspy": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/tinyspy/-/tinyspy-2.1.1.tgz",
+      "integrity": "sha512-XPJL2uSzcOyBMky6OFrusqWlzfFrXtE0hPuMgW8A2HmaqrPo4ZQHRN/V0QXN3FSjKxpsbRrFc5LI7KOwBsT1/w==",
+      "dev": true,
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/ufo": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/ufo/-/ufo-1.3.0.tgz",
+      "integrity": "sha512-bRn3CsoojyNStCZe0BG0Mt4Nr/4KF+rhFlnNXybgqt5pXHNFRlqinSoQaTrGyzE4X8aHplSb+TorH+COin9Yxw==",
+      "dev": true
+    },
     "node_modules/uuid": {
       "version": "9.0.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-9.0.0.tgz",
@@ -1322,6 +1675,29 @@
         }
       }
     },
+    "node_modules/vite-node": {
+      "version": "0.34.3",
+      "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-0.34.3.tgz",
+      "integrity": "sha512-+0TzJf1g0tYXj6tR2vEyiA42OPq68QkRZCu/ERSo2PtsDJfBpDyEfuKbRvLmZqi/CgC7SCBtyC+WjTGNMRIaig==",
+      "dev": true,
+      "dependencies": {
+        "cac": "^6.7.14",
+        "debug": "^4.3.4",
+        "mlly": "^1.4.0",
+        "pathe": "^1.1.1",
+        "picocolors": "^1.0.0",
+        "vite": "^3.0.0 || ^4.0.0"
+      },
+      "bin": {
+        "vite-node": "vite-node.mjs"
+      },
+      "engines": {
+        "node": ">=v14.18.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
     "node_modules/vitefu": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/vitefu/-/vitefu-0.2.4.tgz",
@@ -1335,6 +1711,111 @@
           "optional": true
         }
       }
+    },
+    "node_modules/vitest": {
+      "version": "0.34.3",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-0.34.3.tgz",
+      "integrity": "sha512-7+VA5Iw4S3USYk+qwPxHl8plCMhA5rtfwMjgoQXMT7rO5ldWcdsdo3U1QD289JgglGK4WeOzgoLTsGFu6VISyQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/chai": "^4.3.5",
+        "@types/chai-subset": "^1.3.3",
+        "@types/node": "*",
+        "@vitest/expect": "0.34.3",
+        "@vitest/runner": "0.34.3",
+        "@vitest/snapshot": "0.34.3",
+        "@vitest/spy": "0.34.3",
+        "@vitest/utils": "0.34.3",
+        "acorn": "^8.9.0",
+        "acorn-walk": "^8.2.0",
+        "cac": "^6.7.14",
+        "chai": "^4.3.7",
+        "debug": "^4.3.4",
+        "local-pkg": "^0.4.3",
+        "magic-string": "^0.30.1",
+        "pathe": "^1.1.1",
+        "picocolors": "^1.0.0",
+        "std-env": "^3.3.3",
+        "strip-literal": "^1.0.1",
+        "tinybench": "^2.5.0",
+        "tinypool": "^0.7.0",
+        "vite": "^3.0.0 || ^4.0.0",
+        "vite-node": "0.34.3",
+        "why-is-node-running": "^2.2.2"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": ">=v14.18.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@vitest/browser": "*",
+        "@vitest/ui": "*",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "playwright": "*",
+        "safaridriver": "*",
+        "webdriverio": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "playwright": {
+          "optional": true
+        },
+        "safaridriver": {
+          "optional": true
+        },
+        "webdriverio": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.2.2.tgz",
+      "integrity": "sha512-6tSwToZxTOcotxHeA+qGCq1mVzKR3CwcJGmVcY+QE8SHy6TnpFnh8PAvPNHYr7EcuVeG0QSMxtYCuO1ta/G/oA==",
+      "dev": true,
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yocto-queue": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-1.0.0.tgz",
+      "integrity": "sha512-9bnSc/HEW2uRy67wc+T8UwauLuPJVn28jb+GtJY16iiKWyvmYJRXVT4UamsAEGQfPohgr2q4Tq0sQbQlxTfi1g==",
+      "dev": true,
+      "engines": {
+        "node": ">=12.20"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 5072744..aedf7a2 100644
--- a/package.json
+++ b/package.json
@@ -6,14 +6,16 @@
   "scripts": {
     "dev": "vite",
     "build": "vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest"
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^2.4.2",
     "@xyflow/svelte": "^0.0.12",
     "svelte": "^4.0.5",
     "uuid": "^9.0.0",
-    "vite": "^4.4.5"
+    "vite": "^4.4.5",
+    "vitest": "^0.34.3"
   },
   "dependencies": {
     "@ffmpeg/ffmpeg": "^0.12.4",
diff --git a/src/stores.js b/src/stores.js
index 0f3ad98..c87e649 100644
--- a/src/stores.js
+++ b/src/stores.js
@@ -9,7 +9,7 @@ export const selectedFilter = writable();
 addNode({ name: "punch.mp4" }, "input");
 addNode({ name: "out.mp4" }, "output");
 
-function makeFilterArgs(f) {
+export function makeFilterArgs(f) {
   let fCommand = f.name;
   if (f.params && f.params.length > 0) {
     let params = f.params
diff --git a/tests/unit-tests/commandbuilder.js b/tests/unit-tests/commandbuilder.js
new file mode 100644
index 0000000..b4acea3
--- /dev/null
+++ b/tests/unit-tests/commandbuilder.js
@@ -0,0 +1,35 @@
+import { expect, test, describe } from "vitest";
+import { makeFilterArgs } from "../../src/stores.js";
+
+describe("Filter param builder", () => {
+	test("No params", () => {
+		const results = makeFilterArgs({
+			name: "filter",
+		});
+		expect(results).toBe("filter");
+	});
+
+	test("One param", () => {
+		const results = makeFilterArgs({
+			name: "filter",
+			params: [{ name: "param", value: 10 }],
+		});
+		expect(results).toBe("filter=param=10");
+	});
+
+	test("Param without values", () => {
+		const results = makeFilterArgs({
+			name: "filter",
+			params: [{ name: "param" }],
+		});
+		expect(results).toBe("filter");
+	});
+
+	test("Param with default value", () => {
+		const results = makeFilterArgs({
+			name: "filter",
+			params: [{ name: "param", value: 1, default: 1 }],
+		});
+		expect(results).toBe("filter");
+	});
+});
diff --git a/vite.config.js b/vite.config.js
index fa639c7..426de2a 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -1,16 +1,19 @@
-import { defineConfig } from 'vite'
-import { svelte } from '@sveltejs/vite-plugin-svelte'
+import { defineConfig } from "vite";
+import { svelte } from "@sveltejs/vite-plugin-svelte";
 
 // https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [svelte()],
+	plugins: [svelte()],
+	test: {
+		include: ["tests/**/*.js"],
+	},
 	optimizeDeps: {
-    exclude: ["@ffmpeg/ffmpeg", "@ffmpeg/util"],
-  },
+		exclude: ["@ffmpeg/ffmpeg", "@ffmpeg/util"],
+	},
 	server: {
-    headers: {
-      "Cross-Origin-Opener-Policy": "same-origin",
-      "Cross-Origin-Embedder-Policy": "require-corp",
-    },
-  },
-})
+		headers: {
+			"Cross-Origin-Opener-Policy": "same-origin",
+			"Cross-Origin-Embedder-Policy": "require-corp",
+		},
+	},
+});