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             observable-tests.ts
        
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             / djx / src / test / ts / observable-tests.ts
          
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      import { observe } from "./observable";

      import * as t from "tap";

      const subj1 = observe<number>(({ next, complete }) => {

          next(1);

          complete();

          next(2);

      });

      const consumer1 = {

          sum: 0,

          next(v: number) {

              this.sum += v;

          }

      };

      subj1.subscribe(consumer1);

      t.equal(consumer1.sum, 1, "Should get only one value");

      subj1.subscribe(consumer1);

      t.equal(consumer1.sum, 2, "Should get the value again");

      const consumer2 = {

          value: 0,

          completed: false,

          next(v: number) { this.value = v; },

          complete() { this.completed = true; }

      };

      let maps = 0;

      subj1

          .map(v => {

              t.comment(`map1: ${v * 2}`);

              maps++;

              return v * 2;

          })

          .map (v => {

              t.comment(`map2: ${v * 2}`);

              maps++;

              return v * 2;

          })

          .map(v => {

              t.comment(`map3: ${v * 2}`);

              maps++;

              return v * 2;

          })

          .subscribe(consumer2);

      t.equal(consumer2.value, 8, "Should map");

      t.equal(maps, 3, "The map chain should not be executed after completion");

      t.ok(consumer2.completed, "The completion signal should pass through");

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				import { observe } from "./observable";
				import * as t from "tap";

				const subj1 = observe<number>(({ next, complete }) => {
				next(1);
				complete();
				next(2);
				});

				const consumer1 = {
				sum: 0,
				next(v: number) {
				this.sum += v;
				}
				};

				subj1.subscribe(consumer1);
				t.equal(consumer1.sum, 1, "Should get only one value");

				subj1.subscribe(consumer1);
				t.equal(consumer1.sum, 2, "Should get the value again");

				const consumer2 = {
				value: 0,
				completed: false,
				next(v: number) { this.value = v; },
				complete() { this.completed = true; }
				};

				let maps = 0;

				subj1
				.map(v => {
				t.comment(`map1: ${v * 2}`);
				maps++;
				return v * 2;
				})
				.map (v => {
				t.comment(`map2: ${v * 2}`);
				maps++;
				return v * 2;
				})
				.map(v => {
				t.comment(`map3: ${v * 2}`);
				maps++;
				return v * 2;
				})
				.subscribe(consumer2);

				t.equal(consumer2.value, 8, "Should map");
				t.equal(maps, 3, "The map chain should not be executed after completion");
				t.ok(consumer2.completed, "The completion signal should pass through");