Add: UnknownStepKind error

1 files changed, 7 insertions, 3 deletions

diff --git a/src/steps.rs b/src/steps.rs
index 86ca0a9..7fbb8a8 100644
--- a/src/steps.rs
+++ b/src/steps.rs
@@ -1,4 +1,8 @@
 #[deny(missing_docs)]
+
+use crate::{Error, Result};
+
+
 /// A scenario step.
 ///
 /// The scenario parser creates these kinds of data structures to
@@ -34,14 +38,14 @@ impl ScenarioStep {
     }
 
     /// Construct a step from a line in a scenario.
-    pub fn from_str(text: &str) -> Option<ScenarioStep> {
+    pub fn from_str(text: &str) -> Result<ScenarioStep> {
         let mut words = text.split_whitespace();
 
         let kind = match words.next() {
             Some("given") => StepKind::Given,
             Some("when") => StepKind::When,
             Some("then") => StepKind::Then,
-            _ => return None,
+            _ => return Err(Error::UnknownStepKind),
         };
 
         let mut joined = String::new();
@@ -52,7 +56,7 @@ impl ScenarioStep {
         if joined.len() > 1 {
             joined.pop();
         }
-        Some(ScenarioStep::new(kind, &joined))
+        Ok(ScenarioStep::new(kind, &joined))
     }
 }