added tests for runtime/expressions/variable (#630)

* added tests for runtime/expressions/variable

pkg/runtime/expressions/variable_test.go

@@ -0,0 +1,70 @@
+package expressions_test
+
+import (
+	"context"
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+
+	"github.com/MontFerret/ferret/pkg/runtime/core"
+	"github.com/MontFerret/ferret/pkg/runtime/expressions"
+	"github.com/MontFerret/ferret/pkg/runtime/values"
+)
+
+var sourceMap = core.NewSourceMap("hello", 2, 3)
+var rootScope, _ = core.NewRootScope()
+var _ = rootScope.SetVariable("key", values.NewString("value"))
+
+func TestNewVariableExpression(t *testing.T) {
+
+	Convey("Should not throw error and create a VariableExpression given correct arguments", t, func() {
+		ret, err := expressions.NewVariableExpression(sourceMap, "foo")
+
+		So(ret, ShouldHaveSameTypeAs, &expressions.VariableExpression{})
+		So(err, ShouldBeNil)
+	})
+
+	Convey("Should throw error when given no name argument", t, func() {
+		_, err := expressions.NewVariableExpression(sourceMap, "")
+
+		So(err, ShouldHaveSameTypeAs, core.ErrMissedArgument)
+	})
+
+	Convey("Calling .Exec should return the correct variable set in the given scope", t, func() {
+		ret, _ := expressions.NewVariableExpression(sourceMap, "key")
+		value, err := ret.Exec(context.TODO(), rootScope)
+
+		So(value, ShouldEqual, "value")
+		So(err, ShouldBeNil)
+	})
+}
+
+func TestNewVariableDeclarationExpression(t *testing.T) {
+	Convey("Should not throw error and create a NewVariableDeclarationExpression given correct arguments", t, func() {
+		variableExpression, _ := expressions.NewVariableExpression(sourceMap, "foo")
+		ret, err := expressions.NewVariableDeclarationExpression(sourceMap, "test", variableExpression)
+
+		So(ret, ShouldHaveSameTypeAs, &expressions.VariableDeclarationExpression{})
+		So(err, ShouldBeNil)
+	})
+
+	Convey("Should throw error if init argument is nil", t, func() {
+		_, err := expressions.NewVariableDeclarationExpression(sourceMap, "test", nil)
+
+		So(err, ShouldHaveSameTypeAs, core.ErrMissedArgument)
+	})
+
+	Convey("Calling .Exec should add the value retrieved by its VariableExpression with its own name as key to the given scope", t, func() {
+		variableExpression, _ := expressions.NewVariableExpression(sourceMap, "key")
+		variableDeclarationExpression, _ := expressions.NewVariableDeclarationExpression(sourceMap, "keyTwo", variableExpression)
+		_, err := variableDeclarationExpression.Exec(context.TODO(), rootScope)
+
+		So(err, ShouldBeNil)
+
+		value, _ := rootScope.GetVariable("key")
+		value2, _ := rootScope.GetVariable("keyTwo")
+
+		So(value, ShouldEqual, "value")
+		So(value2, ShouldEqual, "value")
+	})
+}