add simple test case

Author: lpatiny

src/__tests__/simple.js

@@ -0,0 +1,90 @@
+'use strict';
+
+var gsd = require('../gsd');
+
+describe('Simple test cases', () => {
+  let X = [];
+  let Y = [];
+  for (let i = 0; i < 10; i++) {
+    X.push(X.length);
+    Y.push(0);
+  }
+  for (let i = 0; i <= 10; i++) {
+    X.push(X.length);
+    Y.push(i > 5 ? 10 - i : i);
+  }
+  for (let i = 0; i < 10; i++) {
+    X.push(X.length);
+    Y.push(0);
+  }
+
+  it('gsd not realtop', () => {
+    let peaks = gsd(X, Y, {
+      realTopDetection: false,
+      smoothY: true,
+      sgOptions: {
+        windowSize: 5,
+        polynomial: 3
+      }
+    });
+
+    expect(peaks).toStrictEqual([
+      {
+        base: 1.1956287811760204,
+        index: 15,
+        soft: false,
+        width: 2,
+        x: 15,
+        y: 4.657142857142857
+      }
+    ]);
+  });
+
+  it('gsd not realtop asymetric', () => {
+    let Y2 = Y.slice(0);
+    Y2[14] = 5;
+    let peaks = gsd(X, Y2, {
+      realTopDetection: false,
+      smoothY: true,
+      sgOptions: {
+        windowSize: 5,
+        polynomial: 3
+      }
+    });
+
+    expect(peaks).toStrictEqual([
+      {
+        base: 1.2434539324230613,
+        index: 15,
+        soft: false,
+        width: 3,
+        x: 15,
+        y: 5
+      }
+    ]);
+  });
+
+  it('gsd realtop', () => {
+    let Y2 = Y.slice();
+    Y2[14] = 5;
+    let peaks = gsd(X, Y2, {
+      realTopDetection: true,
+      smoothY: true,
+      sgOptions: {
+        windowSize: 5,
+        polynomial: 3
+      }
+    });
+
+    expect(peaks).toStrictEqual([
+      {
+        base: 1.2434539324230613,
+        index: 15,
+        soft: false,
+        width: 3,
+        x: 14.755485084898725,
+        y: 3.7914767697342637
+      }
+    ]);
+  });
+});