33 строки
985 B
JavaScript
33 строки
985 B
JavaScript
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require("../env");
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var assert = require("../env-assert");
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module.exports = {
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topic: function() {
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return d3.select("body").append("div").transition();
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},
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"calls the function once": function(transition) {
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var count = 0;
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transition.call(function() { ++count; });
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assert.equal(count, 1);
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},
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"passes any optional arguments": function(transition) {
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var abc;
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transition.call(function(selection, a, b, c) { abc = [a, b, c]; }, "a", "b", "c");
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assert.deepEqual(abc, ["a", "b", "c"]);
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},
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"passes the transition as the first argument": function(transition) {
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var t;
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transition.call(function(x) { t = x; });
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assert.isTrue(t === transition);
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},
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"uses the transition as the context": function(transition) {
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var t;
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transition.call(function() { t = this; });
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assert.isTrue(t === transition);
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},
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"returns the current transition": function(transition) {
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assert.isTrue(transition.call(function() {}) === transition);
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}
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};
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