add case for filterProfile func

pkg/cover/server.go

@@ -187,7 +187,7 @@ func profile(c *gin.Context) {
 	}
 }
 
-// filterProfile output profiles of the packages matching the coverPkg
+// filterProfile filters profiles of the packages matching the coverPkg
 func filterProfile(coverPkg []string, profiles []*cover.Profile) ([]*cover.Profile, error) {
 	var out = make([]*cover.Profile, 0)
 

pkg/cover/server_test.go

@@ -6,11 +6,13 @@ import (
 	"net/http/httptest"
 	"net/url"
 	"os"
+	"reflect"
 	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
+	"golang.org/x/tools/cover"
 )
 
 // MockStore is mock store mainly for unittest
@@ -216,10 +218,77 @@ func TestInitService(t *testing.T) {
 }
 
 func TestFilterProfile(t *testing.T) {
-	// var tcs = []struct {
-	// 	pattern  []string
-	// 	profile  []*cover.Profile
-	// 	expected []*cover.Profile
-	// 	err      error
-	// }{}
+	var tcs = []struct {
+		name      string
+		pattern   []string
+		input     []*cover.Profile
+		output    []*cover.Profile
+		expectErr bool
+	}{
+		{
+			name:    "valid test",
+			pattern: []string{"some/fancy/gopath", "a/fancy/gopath"},
+			input: []*cover.Profile{
+				{
+					FileName: "some/fancy/gopath/a.go",
+				},
+				{
+					FileName: "some/fancy/gopath/b/a.go",
+				},
+				{
+					FileName: "a/fancy/gopath/a.go",
+				},
+				{
+					FileName: "b/fancy/gopath/a.go",
+				},
+				{
+					FileName: "b/a/fancy/gopath/a.go",
+				},
+			},
+			output: []*cover.Profile{
+				{
+					FileName: "some/fancy/gopath/a.go",
+				},
+				{
+					FileName: "some/fancy/gopath/b/a.go",
+				},
+				{
+					FileName: "a/fancy/gopath/a.go",
+				},
+				{
+					FileName: "b/a/fancy/gopath/a.go",
+				},
+			},
+		},
+	}
+
+	for _, tc := range tcs {
+		t.Run(tc.name, func(t *testing.T) {
+			out, err := filterProfile(tc.pattern, tc.input)
+			if err != nil {
+				if !tc.expectErr {
+					t.Errorf("Unexpected error: %v", err)
+				}
+				return
+			}
+
+			if tc.expectErr {
+				t.Errorf("Expected an error, but got value %s", stringifyCoverProfile(out))
+			}
+
+			if !reflect.DeepEqual(out, tc.output) {
+				t.Errorf("Mismatched results. \nExpected: %s\nActual:%s", stringifyCoverProfile(tc.output), stringifyCoverProfile(out))
+			}
+
+		})
+	}
+}
+
+func stringifyCoverProfile(profiles []*cover.Profile) string {
+	res := make([]cover.Profile, 0, len(profiles))
+	for _, p := range profiles {
+		res = append(res, *p)
+	}
+
+	return fmt.Sprintf("%#v", res)
 }