refactor: move things to packages (#39)

internal/updater/changelog_test.go

@@ -0,0 +1,60 @@
+package updater
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestChangelogUpdater_UpdateContent(t *testing.T) {
+	tests := []updaterTestCase{
+		{
+			name:    "empty file",
+			content: "",
+			info:    ReleaseInfo{ChangelogEntry: "## v1.0.0\n"},
+			want:    "# Changelog\n\n## v1.0.0\n",
+			wantErr: assert.NoError,
+		},
+		{
+			name: "well-formatted changelog",
+			content: `# Changelog
+
+## v0.0.1
+
+- Bazzle
+
+## v0.1.0
+
+### Bazuuum
+`,
+			info: ReleaseInfo{ChangelogEntry: "## v1.0.0\n\n- Version 1, juhu.\n"},
+			want: `# Changelog
+
+## v1.0.0
+
+- Version 1, juhu.
+
+## v0.0.1
+
+- Bazzle
+
+## v0.1.0
+
+### Bazuuum
+`,
+			wantErr: assert.NoError,
+		},
+		{
+			name:    "error on invalid header",
+			content: "What even is this file?",
+			info:    ReleaseInfo{ChangelogEntry: "## v1.0.0\n\n- Version 1, juhu.\n"},
+			want:    "",
+			wantErr: assert.Error,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			runUpdaterTest(t, Changelog, tt)
+		})
+	}
+}