feat(spec): version field (#85)

Adds a `version` field to the `jsonnetfile.json`, so that `jb` can automatically recognize too old / too new schema versions, instead of panicking.

spec/v1/deps/dependencies_test.go

@@ -0,0 +1,80 @@
+// Copyright 2018 jsonnet-bundler authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package deps
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParseDependency(t *testing.T) {
+	const testFolder = "test/jsonnet/foobar"
+	err := os.MkdirAll(testFolder, os.ModePerm)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll("test")
+
+	tests := []struct {
+		name string
+		path string
+		want *Dependency
+	}{
+		{
+			name: "Empty",
+			path: "",
+			want: nil,
+		},
+		{
+			name: "Invalid",
+			path: "example.com/foo",
+			want: nil,
+		},
+		{
+			name: "InvalidDomain",
+			path: "example.c/foo/bar",
+			want: nil,
+		},
+		{
+			name: "InvalidDomain2",
+			path: "examplec/foo/bar",
+			want: nil,
+		},
+		{
+			name: "local",
+			path: testFolder,
+			want: &Dependency{
+				Source: Source{
+					LocalSource: &Local{
+						Directory: "test/jsonnet/foobar",
+					},
+				},
+				Version: "",
+			},
+		},
+	}
+	for _, tt := range tests {
+		_ = t.Run(tt.name, func(t *testing.T) {
+			dependency := Parse("", tt.path)
+
+			if tt.path == "" {
+				assert.Nil(t, dependency)
+			} else {
+				assert.Equal(t, tt.want, dependency)
+			}
+		})
+	}
+}