Add test: check whether imag-create works as expected

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

tests/ui/Cargo.toml

@@ -17,3 +17,4 @@ env_logger        = "0.7"
 log               = "0.4"
 predicates        = "1"
 pretty_assertions = "0.6"
+semver            = "0.9"

tests/ui/src/imag_create.rs

@@ -17,3 +17,67 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 //
 
+use std::process::Command;
+
+use assert_cmd::prelude::*;
+use assert_fs::fixture::TempDir;
+
+/// Helper to call imag-create
+pub fn call(tempdir: &TempDir, targets: &[&str]) {
+    let mut bin = binary(tempdir);
+
+    // ensure that stdin is not used by the child process
+    bin.stdin(std::process::Stdio::inherit());
+
+    for target in targets.iter() {
+        bin.arg(target);
+    }
+    debug!("Command = {:?}", bin);
+
+    bin.assert().success();
+}
+
+pub fn binary(tempdir: &TempDir) -> Command {
+    crate::imag::binary(tempdir, "imag-create")
+}
+
+
+#[test]
+fn test_creating_works() {
+    crate::setup_logging();
+    let imag_home = crate::imag::make_temphome();
+    crate::imag_init::call(&imag_home);
+
+    call(&imag_home, &["test"]);
+
+    let entry_path = {
+        let mut path = imag_home.path().to_path_buf();
+        path.push("store");
+        path.push("test");
+        path
+    };
+
+    debug!("Calculated path = {:?}", entry_path);
+
+    assert!(entry_path.exists(), "Entry was not created: {:?}", entry_path);
+    assert!(entry_path.is_file() , "Entry is not a file: {:?}", entry_path);
+
+    let contents  = std::fs::read_to_string(entry_path).unwrap();
+    let mut lines = contents.lines();
+
+    assert_eq!(lines.next(), Some("---"));
+    assert_eq!(lines.next(), Some("[imag]"));
+    {
+        let version_line = lines.next().unwrap();
+        assert!(version_line.starts_with("version = '"));
+        assert!(version_line.ends_with("'"));
+        let version = version_line.replace("version = '", "").replace("'", "");
+        let semver = semver::Version::parse(&version);
+        assert!(semver.is_ok());
+        assert!(!semver.unwrap().is_prerelease()); // we only want full versions in the header
+
+    }
+    assert_eq!(lines.next(), Some("---"));
+    assert_eq!(lines.next(), None);
+}
+

tests/ui/src/lib.rs

@@ -21,6 +21,7 @@ extern crate assert_cmd;
 extern crate assert_fs;
 extern crate env_logger;
 extern crate predicates;
+extern crate semver;
 #[macro_use] extern crate log;
 #[macro_use] extern crate pretty_assertions;