added go module parser tests

pkg/domain/goModuleParser_gomod_test.go

@@ -0,0 +1,63 @@
+package domain_test
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"testing"
+
+	"github.com/GoTestTools/limgo/pkg/domain"
+	"github.com/GoTestTools/limgo/pkg/model/module"
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestParseGoMod(t *testing.T) {
+
+	testcases := []struct {
+		file        string
+		expectGoMod module.GoMod
+		expectError bool
+	}{
+		{
+			file:        "empty_file",
+			expectError: true,
+		},
+		{
+			file:        "missing_go_version",
+			expectError: true,
+		},
+		{
+			file:        "missing_module",
+			expectError: true,
+		},
+		{
+			file: "valid_gomod",
+			expectGoMod: module.GoMod{
+				ModuleName: "github.com/GoTestTools/limgo",
+				GoVersion:  "1.19",
+			},
+			expectError: false,
+		},
+	}
+
+	for _, testcase := range testcases {
+		t.Run(fmt.Sprintf("with %s", testcase.file), func(t *testing.T) {
+			file, err := os.Open(path.Join("testdata", "goModuleParser_gomod", testcase.file))
+			if err != nil {
+				t.Fatalf("Unexpected error occurred when opening file '%s': %v", testcase.file, err)
+			}
+
+			goMod, err := domain.ParseGoMod(file)
+			if testcase.expectError && err == nil {
+				t.Fatalf("Expected error, but got none")
+			}
+			if !testcase.expectError && err != nil {
+				t.Fatalf("Expected no error, but got %v", err)
+			}
+
+			if diff := cmp.Diff(testcase.expectGoMod, goMod); diff != "" {
+				t.Fatalf("Detected difference in parsed GoMod: %s", diff)
+			}
+		})
+	}
+}

pkg/domain/testdata/goModuleParser_gomod/missing_go_version

@@ -0,0 +1,5 @@
+module github.com/GoTestTools/limgo
+
+require github.com/go-errors/errors v1.4.2
+
+require github.com/google/go-cmp v0.5.9

pkg/domain/testdata/goModuleParser_gomod/missing_module

@@ -0,0 +1,5 @@
+go 1.19
+
+require github.com/go-errors/errors v1.4.2
+
+require github.com/google/go-cmp v0.5.9

pkg/domain/testdata/goModuleParser_gomod/valid_gomod

@@ -0,0 +1,7 @@
+module github.com/GoTestTools/limgo
+
+go 1.19
+
+require github.com/go-errors/errors v1.4.2
+
+require github.com/google/go-cmp v0.5.9