Enhance: add testcase for `getIsIsolatedModules`

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e40dd84) 88.29% compared to head (265934b) 88.35%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #84 +/- ## ========================================== + Coverage 88.29% 88.35% +0.06% ========================================== Files 65 66 +1 Lines 1085 1091 +6 Branches 222 223 +1 ========================================== + Hits 958 964 +6 Misses 123 123 Partials 4 4 ``` | [Files](https://app.codecov.io/gh/imjuni/ctix/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ByungJoon+Lee) | Coverage Δ | | |---|---|---| | [.../expect-getIsIsolatedModules-function-component.ts](https://app.codecov.io/gh/imjuni/ctix/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ByungJoon+Lee#diff-c3JjL2NvbXBpbGVycy9fX3Rlc3RzX18vZXhwZWN0cy9leHBlY3QtZ2V0SXNJc29sYXRlZE1vZHVsZXMtZnVuY3Rpb24tY29tcG9uZW50LnRz) | `100.00% <100.00%> (ø)` | | | [src/compilers/getIsIsolatedModules.ts](https://app.codecov.io/gh/imjuni/ctix/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ByungJoon+Lee#diff-c3JjL2NvbXBpbGVycy9nZXRJc0lzb2xhdGVkTW9kdWxlcy50cw==) | `88.88% <100.00%> (+0.65%)` | :arrow_up: | | [src/testenv/env.ts](https://app.codecov.io/gh/imjuni/ctix/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ByungJoon+Lee#diff-c3JjL3Rlc3RlbnYvZW52LnRz) | `100.00% <100.00%> (ø)` | |

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