Update cheatsheets

rspec

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rspec
+
+> Behavior-driven development testing framework written in Ruby to test Ruby code.
+> More information: <https://rspec.info>.
+
+- Initialize an .rspec configuration and a spec helper file:
+
+`rspec --init`
+
+- Run all tests:
+
+`rspec`
+
+- Run a specific directory of tests:
+
+`rspec {{path/to/directory}}`
+
+- Run one or more test files:
+
+`rspec {{path/to/file1 path/to/file2 ...}}`
+
+- Run a specific test in a file (e.g. the test starts on line 83):
+
+`rspec {{path/to/file}}:{{83}}`
+
+- Run specs with a specific seed:
+
+`rspec --seed {{seed_number}}`