Auto merge of #4292 - Turbo87:license-validation, r=Turbo87

Add tests for license expression validation

related to:
- #2595

src/models/version.rs

@@ -177,16 +177,7 @@ impl NewVersion {
 
     fn validate_license(&mut self, license_file: Option<&str>) -> AppResult<()> {
         if let Some(ref license) = self.license {
-            for part in license.split('/') {
-                license_exprs::validate_license_expr(part).map_err(|e| {
-                    cargo_err(&format_args!(
-                        "{}; see http://opensource.org/licenses \
-                         for options, and http://spdx.org/licenses/ \
-                         for their identifiers",
-                        e
-                    ))
-                })?;
-            }
+            validate_license_expr(license)?;
         } else if license_file.is_some() {
             // If no license is given, but a license file is given, flag this
             // crate as having a nonstandard license. Note that we don't
@@ -197,9 +188,19 @@ impl NewVersion {
     }
 }
 
+fn validate_license_expr(s: &str) -> AppResult<()> {
+    for part in s.split('/') {
+        license_exprs::validate_license_expr(part).map_err(|e| {
+            cargo_err(&format_args!("{}; see http://opensource.org/licenses for options, and http://spdx.org/licenses/ for their identifiers", e))
+        })?;
+    }
+
+    Ok(())
+}
+
 #[cfg(test)]
 mod tests {
-    use super::TopVersions;
+    use super::{validate_license_expr, TopVersions};
     use chrono::NaiveDateTime;
 
     #[track_caller]
@@ -269,4 +270,20 @@ mod tests {
             }
         );
     }
+
+    #[test]
+    fn licenses() {
+        assert_ok!(validate_license_expr("MIT"));
+        assert_ok!(validate_license_expr("MIT OR Apache-2.0"));
+        assert_ok!(validate_license_expr("MIT/Apache-2.0"));
+        assert_ok!(validate_license_expr("MIT AND Apache-2.0"));
+
+        let error = assert_err!(validate_license_expr("apache 2.0"));
+        let error = format!("{}", error);
+        assert!(error.starts_with("unknown license or other term: apache; see http"));
+
+        let error = assert_err!(validate_license_expr("MIT OR (Apache-2.0 AND MIT)"));
+        let error = format!("{}", error);
+        assert!(error.starts_with("unknown license or other term: (Apache-2.0; see http"));
+    }
 }