Separate non-scalar tests from test_timestamps
Getting DataFrame, Series, Index tests out of tests.scalars and organizing them better, should make it easier to go and parametrize some older tests, in particular arithmetic and comparisons.
> note to parametrize

Noted. # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19385?src=pr&el=h1) Report
> Merging [#19385](https://codecov.io/gh/pandas-dev/pandas/pull/19385?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/b4662cd9cbcc81f7d55ab15323d8227b8b0803b2?src=pr&el=desc) will **increase** coverage by `0.06%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/19385/graphs/tree.svg?token=eZ4WkYLtcO&width=650&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/19385?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #19385      +/-   ##
==========================================
+ Coverage   91.57%   91.64%   +0.06%     
==========================================
  Files         150      150              
  Lines       48684    48699      +15     
==========================================
+ Hits        44583    44630      +47     
+ Misses       4101     4069      -32
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.01% <ø> (+0.06%)` | :arrow_up: |
| #single | `41.72% <ø> (-0.01%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/19385?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/indexes/interval.py](https://codecov.io/gh/pandas-dev/pandas/pull/19385/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9pbnRlcnZhbC5weQ==) | `92.4% <0%> (-0.02%)` | :arrow_down: |
| [pandas/core/categorical.py](https://codecov.io/gh/pandas-dev/pandas/pull/19385/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY2F0ZWdvcmljYWwucHk=) | `100% <0%> (ø)` | :arrow_up: |
| [pandas/core/reshape/tile.py](https://codecov.io/gh/pandas-dev/pandas/pull/19385/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcmVzaGFwZS90aWxlLnB5) | `90.25% <0%> (ø)` | :arrow_up: |
| [pandas/core/dtypes/generic.py](https://codecov.io/gh/pandas-dev/pandas/pull/19385/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZHR5cGVzL2dlbmVyaWMucHk=) | `100% <0%> (ø)` | :arrow_up: |
| [pandas/core/indexes/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/19385/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9iYXNlLnB5) | `96.46% <0%> (ø)` | :arrow_up: |
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/19385/diff?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `66.95% <0%> (+1.73%)` | :arrow_up: |
| [pandas/io/parquet.py](https://codecov.io/gh/pandas-dev/pandas/pull/19385/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3BhcnF1ZXQucHk=) | `71.55% <0%> (+19.26%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19385?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19385?src=pr&el=footer). Last update [b4662cd...a6abdc2](https://codecov.io/gh/pandas-dev/pandas/pull/19385?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks. a PR to separate into submodules (comparisons, arithmetic, and ops)  would be very helpful (hint to do next).