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nv/html/dwv/tests/math/stats.test.js

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+/**
+ * Tests for the 'math/stats.js' file.
+ */
+// Do not warn if these variables were not defined before.
+/* global QUnit */
+QUnit.module("stats");
+
+/**
+ * Tests for {@link dwv.math.getStats}.
+ * @function module:tests/math~getStats
+ */
+QUnit.test("Test getStats.", function (assert) {
+    var arr0 = [1, 2, 3, 4, 5];
+    var q0 = dwv.math.getStats(arr0);
+    // min
+    assert.equal(q0.min, 1, "min.0");
+    // max
+    assert.equal(q0.max, 5, "max.0");
+    // mean
+    assert.equal(q0.mean, 3, "mean.0");
+    // stdDev
+    assert.equal(q0.stdDev, 1.4142135623730951, "stdDev.0");
+
+    var arr1 = [9, 2, 5, 4, 12, 7, 8, 11, 9, 3, 7, 4, 12, 5, 4, 10, 9, 6, 9, 4];
+    var q1 = dwv.math.getStats(arr1);
+    // min
+    assert.equal(q1.min, 2, "min.1");
+    // max
+    assert.equal(q1.max, 12, "max.1");
+    // mean
+    assert.equal(q1.mean, 7, "mean.1");
+    // stdDev
+    assert.equal(q1.stdDev, 2.9832867780352594, "stdDev.1");
+});
+
+/**
+ * Tests for {@link dwv.math.guid}.
+ * @function module:tests/math~guid
+ */
+QUnit.test("Test GUID.", function (assert) {
+    var id0 = dwv.math.guid();
+    var id1 = dwv.math.guid();
+    assert.equal((id0 === id1), false, "Two GUids should not be equal.");
+
+    var duplicates = 0;
+    // create an array of guids
+    var ids = [];
+    for (var i = 0; i < 1000; ++i) {
+        ids[ids.length] = dwv.math.guid();
+    }
+    // check duplicates
+    var id = 0;
+    for (i = 0; i < ids.length - 1; ++i) {
+        id = ids.pop();
+        if (ids.indexOf(id) !== -1) {
+            ++duplicates;
+        }
+    }
+    assert.equal(duplicates, 0, "1000 GUids should not be equal.");
+});