add simple unit tests

Author: g-harel

testing/blobs.test.ts

@@ -0,0 +1,22 @@
+import blobs, {BlobOptions} from "..";
+
+describe("blobs", () => {
+    it("should return a different result when seed is not provided", () => {
+        const options: BlobOptions = {size: 100, complexity: 1, contrast: 1, color: "red"};
+
+        const a = blobs(options);
+        const b = blobs(options);
+
+        expect(a).not.toEqual(b);
+    });
+
+    it("should return the same result when the seed is provided", () => {
+        const options: BlobOptions = {size: 200, complexity: 0.5, contrast: 0.5, color: "blue"};
+        options.seed = "abcde";
+
+        const a = blobs(options);
+        const b = blobs(options);
+
+        expect(a).toEqual(b);
+    });
+});

testing/snapshots.test.ts

@@ -3,14 +3,14 @@ import blobs, {BlobOptions} from "..";
 // Sanity checks to ensure the output remains consistent
 // across changes to the source.
 const testCases: Record<string, BlobOptions> = {
-    "fill": {
+    fill: {
         size: 109,
         complexity: 0.1,
         contrast: 0.331,
         color: "red",
         seed: "fill",
     },
-    "stroke": {
+    stroke: {
         size: 226,
         complexity: 0.91,
         contrast: 0.6,
@@ -20,15 +20,14 @@ const testCases: Record<string, BlobOptions> = {
         },
         seed: "stroke",
     },
-    "guides": {
+    guides: {
         size: 781,
         complexity: 1,
         contrast: 0.331,
         color: "yellow",
         guides: true,
         seed: "guides",
     },
-
 };
 
 for (const testCase of Object.keys(testCases)) {