Add test: check whether default configuration is added when imag-init is called

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

tests/ui/Cargo.toml

@@ -10,9 +10,10 @@ edition = "2018"
 publish = false
 
 [dependencies]
-assert_cmd = "0.11"
-assert_fs  = "0.11"
-duct       = "0.13"
-env_logger = "0.7"
-log        = "0.4"
-predicates = "1"
+assert_cmd        = "0.11"
+assert_fs         = "0.11"
+duct              = "0.13"
+env_logger        = "0.7"
+log               = "0.4"
+predicates        = "1"
+pretty_assertions = "0.6"

tests/ui/src/imag_init.rs

@@ -48,3 +48,34 @@ fn test_init_makes_imag_dir() {
     assert!(imag_home.path().exists(), "imag dir does not exist");
 }
 
+#[test]
+fn test_init_creates_default_config() {
+    use pretty_assertions::assert_eq;
+
+    crate::setup_logging();
+    let imag_home = crate::imag::make_temphome();
+    call(&imag_home);
+
+    const CONFIGURATION_STR : &str = include_str!("../../../imagrc.toml");
+    let config = std::fs::read_to_string({
+        let mut path = imag_home.path().to_path_buf();
+        path.push("imagrc.toml");
+        path
+    })
+    .unwrap();
+
+    // the imagrc is based on the example imagrc from this repository, but the one
+    // thing that differs is that the default level for logging output is "info" rather than
+    // "default"
+    CONFIGURATION_STR
+        .to_string()
+        .replace(
+            r#"level = "debug""#,
+            r#"level = "info""#
+        )
+        .lines()
+        .zip(config.lines())
+        .for_each(|(orig, created)| {
+            assert_eq!(orig, created);
+        });
+}

tests/ui/src/lib.rs

@@ -22,6 +22,7 @@ extern crate assert_fs;
 extern crate env_logger;
 extern crate predicates;
 #[macro_use] extern crate log;
+#[macro_use] extern crate pretty_assertions;
 
 #[cfg(test)] mod imag;
 #[cfg(test)] mod imag_annotate;