Test: Add tests for file.go

.gitignore

@@ -16,6 +16,9 @@ dist
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 
+# Dummy conflict code
+conflict/testdata/output.swift
+
 ### Code ###
 # Visual Studio Code - https://code.visualstudio.com/
 .settings/

conflict/file_test.go

@@ -0,0 +1,60 @@
+package conflict
+
+import (
+	"reflect"
+	"testing"
+)
+
+var conflictFile = struct {
+	readPath  string
+	writePath string
+	markers   []int
+	lineNum   int
+}{
+	readPath:  "testdata/CircularCrownSelector.swift",
+	writePath: "testdata/output.swift",
+	markers:   []int{14, 22, 30, 38},
+	lineNum:   39,
+}
+
+func TestRead(t *testing.T) {
+	f := File{AbsolutePath: conflictFile.readPath}
+	if err := f.Read(); err != nil {
+		t.Error("Read failed: could not read file")
+	}
+
+	if len(f.Lines) != conflictFile.lineNum {
+		t.Errorf("Read failed: got %d lines, wanted %d lines", len(f.Lines), conflictFile.lineNum)
+	}
+}
+
+func TestWriteChanges(t *testing.T) {
+	f := File{AbsolutePath: conflictFile.readPath}
+	if err := f.Read(); err != nil {
+		t.Error("WriteChanges/Read failed")
+	}
+
+	conflicts, err := parseConflictsIn(f, conflictFile.markers)
+	if err != nil {
+		t.Error("WriteChanges/parseConflicts failed")
+	}
+
+	f.Conflicts = conflicts
+	targetConflict := &f.Conflicts[0]
+	targetConflict.Choice = Local
+
+	f.AbsolutePath = conflictFile.writePath
+	if err := f.WriteChanges(); err != nil {
+		t.Errorf("WriteChages failed: %s", err.Error())
+	}
+
+	expected := f.Lines[11:22]
+	f.Lines = nil
+	if err := f.Read(); err != nil {
+		t.Error("WriteChanges/Read failed")
+	}
+
+	output := f.Lines[11:]
+	if reflect.DeepEqual(output, expected) {
+	}
+}