implement reporter

also introduce gomock and tests

internal/reporter_test.go

@@ -0,0 +1,42 @@
+package internal_test
+
+import (
+	"io"
+	"math/big"
+	"testing"
+
+	"git.naterciomoniz.net/applications/broker2anexoj/internal"
+	"git.naterciomoniz.net/applications/broker2anexoj/internal/mocks"
+	"go.uber.org/mock/gomock"
+)
+
+func TestReporter_Run(t *testing.T) {
+	ctrl := gomock.NewController(t)
+
+	rec := mocks.NewMockRecord(ctrl)
+	rec.EXPECT().Price().Return(big.NewFloat(1.25)).AnyTimes()
+	rec.EXPECT().Quantity().Return(big.NewFloat(10)).AnyTimes()
+	rec.EXPECT().Side().Return(internal.SideBuy).AnyTimes()
+	rec.EXPECT().Symbol().Return("TEST").AnyTimes()
+
+	reader := mocks.NewMockRecordReader(ctrl)
+	records := []internal.Record{
+		rec,
+		rec,
+	}
+	reader.EXPECT().ReadRecord().DoAndReturn(func() (internal.Record, error) {
+		if len(records) > 0 {
+			r := records[0]
+			records = records[1:]
+			return r, nil
+		} else {
+			return nil, io.EOF
+		}
+	}).AnyTimes()
+
+	reporter := internal.NewReporter(reader)
+	gotErr := reporter.Run()
+	if gotErr != nil {
+		t.Fatalf("got unexpected err: %v", gotErr)
+	}
+}