Add coverage TIL

README.md

@@ -10,7 +10,7 @@ others" and "this is something really annoying that took forever to find out and
 I know I'll come across it again at some point so I want it committed for
 posterity".
 
-30 TILs and growing!
+31 TILs and growing!
 
 ---
 
@@ -39,6 +39,7 @@ posterity".
 ### Elixir
 
 - [Get last value in IEx](elixir/get-last-value-in-iex.md)
+- [Test coverage](elixir/test-coverage.md)
 - [Test setup](elixir/test-setup.md)
 - [Turn on history in IEx](elixir/turn-on-history-in-iex.md)
 

elixir/test-coverage.md

@@ -0,0 +1,5 @@
+# Test coverage
+
+```shell
+$ mix test --cover
+```

structure.json

@@ -1 +1 @@
-{"C++":["Scoped enums"],"JavaScript":["File system flags in Node","Readline interface","Readline interface 2","Regular expression flags"],"shell":["List directories only","`mv` Tips and Tricks","Oh My Zsh Aliases","String manipulation","`which`"],"vim":["Ruler"],"WebAssembly":["Break statements","Global variables","Memory management","Tables"],"Rails":["Active record attributes","`select` vs `pluck`"],"PostgreSQL":["Filter clause"],"VS Code":["External terminal"],"Ruby":["`squeeze`"],"Linux":["Force quit hung ssh","Killing other ssh connections","U2F","Yubico Authenticator on Fedora"],"git":["Find file creation date","Set commit message editor"],"nginx":["Redirect requests to new domain"],"Elixir":["Get last value in IEx","Test setup","Turn on history in IEx"]}
+{"C++":["Scoped enums"],"JavaScript":["File system flags in Node","Readline interface","Readline interface 2","Regular expression flags"],"shell":["List directories only","`mv` Tips and Tricks","Oh My Zsh Aliases","String manipulation","`which`"],"vim":["Ruler"],"WebAssembly":["Break statements","Global variables","Memory management","Tables"],"Rails":["Active record attributes","`select` vs `pluck`"],"PostgreSQL":["Filter clause"],"VS Code":["External terminal"],"Ruby":["`squeeze`"],"Linux":["Force quit hung ssh","Killing other ssh connections","U2F","Yubico Authenticator on Fedora"],"git":["Find file creation date","Set commit message editor"],"nginx":["Redirect requests to new domain"],"Elixir":["Get last value in IEx","Test coverage","Test setup","Turn on history in IEx"]}