Convert ShouldBeErrorId to Should -Throw -ErrorId in PowerShell tests.
Get rid of try { } catch { } formula to assert that errors were thrown.
Small fixes in tests to obey the new Pester -Parameter syntax.
Based on standard practices, we need to have a copyright and license notice at the top of each source file. Removed existing copyrights and updated/added copyright notices for .h, .cpp, .cs, .ps1, and .psm1 files.
Updated module manifests for consistency to have Author = "PowerShell" and Company = "Microsoft Corporation". Removed multiple line breaks.
Separate PR coming to update contribution document for new source files: #6140
Manually reviewed each change.
Fix#6073
* Make small optimization in parser tests
* Add Clear() for common command
Remove commands from AfterEach
* Refactoring test 'functions are resolved before cmdlets'
The tokenizer did multiple scans the script line to get tokens. Before
the fix the tokenizer on the first pass examined that string as
double-quoted (Expandable) string not as here string, figured the
average double quotation mark as a closing and then starting with the
single quotation mark continued processing the line as single-quoted
string which had no closing single quotation mark.
The fix is to stop the first scan pass after getting '=' (assume
assignment-expression '$a=' for next pass).
