fix: Correct mock data and test environment handling

This commit addresses several issues in the testing framework:

- Corrected a malformed URL in the mock response data in `pkg/github/github.go`.
- Fixed a bug in the mock HTTP client in `pkg/mocks/http.go` where the response body was being exhausted after the first read. The client now returns a deep copy of the response for each call.
- Refactored the environment variable handling in `TDD/collect_commands_test.go` to use `t.Setenv`, ensuring proper cleanup after the test.

TDD/collect_commands_test.go

@@ -4,14 +4,12 @@ import (
 	"bytes"
 	"context"
 	"github.com/Snider/Borg/cmd"
-	"os"
 	"strings"
 	"testing"
 )
 
 func TestCollectCommands(t *testing.T) {
-	os.Setenv("BORG_PLEXSUS", "0")
-	defer os.Unsetenv("BORG_PLEXSUS")
+	t.Setenv("BORG_PLEXSUS", "0")
 
 	testCases := []struct {
 		name     string

pkg/github/github.go

@@ -33,7 +33,7 @@ func newAuthenticatedClient(ctx context.Context) *http.Client {
 			},
 			"https://api.github.com/orgs/test/repos": {
 				StatusCode: http.StatusOK,
-				Body:       io.NopCloser(bytes.NewBufferString(`[{"clone_url": "https.github.com/test/repo2.git"}]`)),
+				Body:       io.NopCloser(bytes.NewBufferString(`[{"clone_url": "https://github.com/test/repo2.git"}]`)),
 				Header:     make(http.Header),
 			},
 		}

pkg/mocks/http.go

@@ -15,11 +15,34 @@ type MockRoundTripper struct {
 func (m *MockRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
 	url := req.URL.String()
 	if resp, ok := m.Responses[url]; ok {
-		// Create a new reader for the body each time, as it can be read only once.
-		bodyBytes, _ := io.ReadAll(resp.Body)
+		// Read the original body
+		bodyBytes, err := io.ReadAll(resp.Body)
+		if err != nil {
+			return nil, err
+		}
 		resp.Body.Close() // close original body
+
+		// Re-hydrate the original body so it can be read again
 		resp.Body = io.NopCloser(bytes.NewReader(bodyBytes))
-		return resp, nil
+
+		// Create a deep copy of the response
+		newResp := &http.Response{
+			Status:           resp.Status,
+			StatusCode:       resp.StatusCode,
+			Proto:            resp.Proto,
+			ProtoMajor:       resp.ProtoMajor,
+			ProtoMinor:       resp.ProtoMinor,
+			Header:           resp.Header.Clone(),
+			Body:             io.NopCloser(bytes.NewReader(bodyBytes)),
+			ContentLength:    resp.ContentLength,
+			TransferEncoding: resp.TransferEncoding,
+			Close:            resp.Close,
+			Uncompressed:     resp.Uncompressed,
+			Trailer:          resp.Trailer.Clone(),
+			Request:          resp.Request,
+			TLS:              resp.TLS,
+		}
+		return newResp, nil
 	}
 	return &http.Response{
 		StatusCode: http.StatusNotFound,