Combine integration tests into single binary (#679)

Combine all integration test binaries into a single binary with the root
in `tests/lib.rs`. This also turns of automatic test discovery, so
when adding another set of integration tests, a mod statement will need
to be added to `tests/lib.rs`.

Cargo.toml

@@ -8,6 +8,7 @@ homepage    = "https://github.com/casey/just"
 repository  = "https://github.com/casey/just"
 readme      = "crates-io-readme.md"
 edition     = "2018"
+autotests   = false
 
 [features]
 default       = []
@@ -53,3 +54,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [profile.release]
 lto = true
+
+[[test]]
+name = "integration"
+path = "tests/lib.rs"

src/lexer.rs

@@ -228,10 +228,7 @@ impl<'src> Lexer<'src> {
 
   /// True if `c` can be the first character of an identifier
   fn is_identifier_start(c: char) -> bool {
-    match c {
-      'a'..='z' | 'A'..='Z' | '_' => true,
-      _ => false,
-    }
+    matches!(c, 'a'..='z' | 'A'..='Z' | '_')
   }
 
   /// True if `c` can be a continuation character of an idenitifier
@@ -240,10 +237,7 @@ impl<'src> Lexer<'src> {
       return true;
     }
 
-    match c {
-      '0'..='9' | '-' => true,
-      _ => false,
-    }
+    matches!(c, '0'..='9' | '-')
   }
 
   /// Consume the text and produce a series of tokens

tests/lib.rs

@@ -0,0 +1,12 @@
+mod completions;
+mod dotenv;
+mod edit;
+mod examples;
+mod init;
+mod interrupts;
+mod invocation_directory;
+mod misc;
+mod readme;
+mod search;
+mod shell;
+mod working_directory;