Add informative error when no valid version is detected

Author: mattnichols

lib/binks/gradle.rb

@@ -12,6 +12,7 @@ def initialize(filename)
     def version
       @version ||= begin
         match = @text.match(GRADLE_VERSION)
+        raise ::Binks::BinksError, "No valid version detected in #{@filename}" if match.nil?
         ::Binks::VersionParser.new(match[:version])
       end
     end

spec/binks/gradle_spec.rb

@@ -21,6 +21,14 @@
     end
   end
 
+  context "with invalid version" do
+    let(:build_file) { "spec/resources/build_invalid.gradle" }
+
+    it "loads version of with correct value" do
+      expect { subject.version }.to raise_error ::Binks::BinksError, "No valid version detected in spec/resources/build_invalid.gradle"
+    end
+  end
+
   it "loads version of type VersionParser" do
     expect(subject.version.class).to eq(::Binks::VersionParser)
   end

spec/resources/build_invalid.gradle

@@ -0,0 +1,4 @@
+apply plugin: 'java'
+apply plugin: 'eclipse'
+
+version = '0.0.1-some_invalid_junk'