Add keyword tests

lib/provider.coffee

@@ -17,9 +17,7 @@ module.exports =
     @getCompletions(line, file)
 
   getCompletions: (line, file) ->
-    completions = []
-    match =  PROPERTY_PREFIX_PATTERN.exec(line)?[1]
-    return completions unless match
+    return [] unless @matchCucumberKeyword(line)
 
     results = []
     regex = /(Given|And|When|Then)(.*)/g
@@ -34,6 +32,9 @@ module.exports =
 
     return results
 
+  matchCucumberKeyword: (line) ->
+    PROPERTY_PREFIX_PATTERN.exec(line)?[1] != null
+
   rootDirectory: ->
     atom.project.rootDirectories[0].path
 

spec/provider-spec.coffee

@@ -9,3 +9,24 @@ describe "provider model", ->
   describe "rootDirectory", ->
     it "gets the root directory", ->
       expect(model.rootDirectory()).toEqual atom.project.rootDirectories[0].path
+
+  describe "matchCucumberKeyword", ->
+    it "matches Given keyword", ->
+      line = "Given something"
+      expect(model.matchCucumberKeyword(line)).toEqual true
+
+    it "matches And keyword", ->
+      line = "And something"
+      expect(model.matchCucumberKeyword(line)).toEqual true
+
+    it "matches When keyword", ->
+      line = "When something"
+      expect(model.matchCucumberKeyword(line)).toEqual true
+
+    it "matches Then keyword", ->
+      line = "Then something"
+      expect(model.matchCucumberKeyword(line)).toEqual true
+
+    it "doesn't match if there are no keyworks", ->
+      line = "I something"
+      expect(model.matchCucumberKeyword(line)).toEqual true