add test cases for header parsing

pkg/commands/headers_test.go

@@ -0,0 +1,95 @@
+package commands
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestHeaderParsing(t *testing.T) {
+	for _, testCase := range []struct {
+		name      string
+		values    []string
+		wantError bool
+		expected  http.Header
+	}{
+		{
+			name: "single-valued header",
+			values: []string{
+				"foo: bar",
+			},
+			expected: http.Header{
+				"Foo": []string{"bar"},
+			},
+		},
+		{
+			name: "multiple headers",
+			values: []string{
+				"foo: bar",
+				"baz: qux",
+			},
+			expected: http.Header{
+				"Foo": []string{"bar"},
+				"Baz": []string{"qux"},
+			},
+		},
+		{
+			name: "single header with multiple values",
+			values: []string{
+				"foo: bar",
+				"foo:baz",
+			},
+			expected: http.Header{
+				"Foo": []string{"bar", "baz"},
+			},
+		},
+		{
+			name: "malformed",
+			values: []string{
+				"foo",
+			},
+			wantError: true,
+		},
+		{
+			name: "from file",
+			values: []string{
+				"@testdata/headers.txt",
+			},
+			expected: http.Header{
+				"Foo": []string{"bar"},
+				"Baz": []string{"qux"},
+			},
+		},
+		{
+			name: "nonexistent file",
+			values: []string{
+				"@notreal.txt",
+			},
+			wantError: true,
+		},
+		{
+			name: "file and inline",
+			values: []string{
+				"@testdata/headers.txt",
+				"baz: bop",
+				"other: one",
+			},
+			expected: http.Header{
+				"Foo":   []string{"bar"},
+				"Baz":   []string{"qux", "bop"},
+				"Other": []string{"one"},
+			},
+		},
+	} {
+		t.Run(testCase.name, func(t *testing.T) {
+			result, err := parseHeaders(testCase.values)
+			if testCase.wantError {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, testCase.expected, result)
+			}
+		})
+	}
+}

pkg/commands/testdata/headers.txt

@@ -0,0 +1,2 @@
+foo: bar
+baz: qux