fix: copy paste last value pasting a promise

[gokulk16]

Changes:

• Removing the it and using test to be consistent in the unit tests
• Fix for the bug where the Promise object is printed instead of pasting the last numeric value
• Added unit tests for the above fix and its relevant methods
• round of copied values using keyboard shortcuts

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	64.33% ⬆️ +0.67%	691 / 1074
🔵	Statements	64.33% ⬆️ +0.67%	691 / 1074
🔵	Functions	64.06% ⬆️ +2.16%	41 / 64
🔵	Branches	75.19% ⬆️ +0.59%	97 / 129

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
js/editor.js	58.86%	78.16%	59.18%	58.86%	38, 41-42, 48-54, 56-59, 73-78, 86-90, 120-123, 129-130, 161-162, 192-196, 199-208, 210-250, 252-279, 281-287, 290-315, 321-325, 330-331, 334-343, 387-390, 414, 425-430, 443-445, 452-482, 503-504, 537-553, 590-591, 617-621, 623-628, 630-634, 654-656, 658-682, 696-697, 700-704, 706-717, 719-726, 728-730, 732-738, 740-743

Generated in workflow #35