Add ts side tests

Author: kevinkassimo

tests/015_import_no_ext.out

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+Trying /Users/kevinqian/Desktop/Programming/Deno/deno/tests/015_import_no_ext.ts...
+Trying /Users/kevinqian/Desktop/Programming/Deno/deno/tests/subdir/mod3.ts...
+Trying /Users/kevinqian/Desktop/Programming/Deno/deno/tests/subdir/mod4.ts...
+Trying /Users/kevinqian/Desktop/Programming/Deno/deno/tests/subdir/mod4.js...
+Trying http://localhost:4545/tests/subdir/mod2.ts...
+Downloading http://localhost:4545/tests/subdir/mod2.ts
+Downloading http://localhost:4545/tests/subdir/print_hello.ts
+true
+true
+true
+true

tests/015_import_no_ext.ts

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+import { isTSFile, printHello } from "./subdir/mod3";
+console.log(isTSFile);
+console.log(!!printHello);
+
+import { isMod4 } from "./subdir/mod4";
+console.log(isMod4);
+
+import { printHello as ph } from "http://localhost:4545/tests/subdir/mod2";
+console.log(!!ph);

tests/subdir/mod3.js

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+export const isTSFile = false;

tests/subdir/mod3.ts

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+export const isTSFile = true;
+export { printHello } from "./print_hello.ts";

tests/subdir/mod4.js

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+export const isMod4 = true;