codegen: add interpreter tests

Also simplify project structure. The executable is now produced in
the root directory. Work in progress.

1 files changed, 47 insertions, 0 deletions

diff --git a/codegen/interpreter_test.go b/codegen/interpreter_test.go
new file mode 100644
index 0000000..1d8a6b5
--- /dev/null
+++ b/codegen/interpreter_test.go
@@ -0,0 +1,47 @@
+package codegen
+
+import (
+	"fmt"
+	"log"
+	"testing"
+
+	"github.com/gnolang/parscan/lang/golang"
+)
+
+func TestEval(t *testing.T) {
+	for _, test := range evalTests {
+		test := test
+		t.Run("", func(t *testing.T) {
+			interp := NewInterpreter(golang.GoParser)
+			errStr := ""
+			r, e := interp.Eval(test.src)
+			if e != nil {
+				errStr = e.Error()
+			}
+			if errStr != test.err {
+				t.Errorf("got error %#v, want error %#v", errStr, test.err)
+			}
+			res := fmt.Sprintf("%v", r)
+			if res != test.res {
+				t.Errorf("got %#v, want %#v", res, test.res)
+			}
+			log.Println(r, e)
+		})
+	}
+}
+
+var evalTests = []struct {
+	name, src, res, err string
+}{{ /* #00 */
+	src: "1 + 2",
+	res: "3",
+}, { // #01
+	src: "a := 2; a = a + 3",
+	res: "5",
+}, { // #02
+	src: "func f(a int) int { return a + 1 }; f(5)",
+	res: "6",
+}, { // #03
+	src: "func f(a int) (b int) { b = a + 1; return }; f(5)",
+	res: "6",
+}}