Add basic test cases

Author: hunts

main_test.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"io/ioutil"
+	"os"
+	"strings"
+	"testing"
+)
+
+var (
+	inDir  = "testdata/input/"
+	outDir = "testdata/output/"
+)
+
+func TestProcess(t *testing.T) {
+	files, err := ioutil.ReadDir(inDir)
+	if err != nil {
+		t.Errorf("failed to read the testdata: %s", err)
+	}
+
+	for _, file := range files {
+		t.Run(file.Name(), func(t *testing.T) {
+			inpath := inDir + file.Name()
+			outpath := outDir + file.Name()
+
+			f, err := os.Open(inpath)
+			if err != nil {
+				t.Errorf("failed to load input: %s", err)
+			}
+
+			in := bufio.NewReader(f)
+			out := &bytes.Buffer{}
+
+			process(in, out)
+
+			expectedBytes, err := ioutil.ReadFile(outpath)
+			if err != nil {
+				t.Errorf("failed to load output: %s", err)
+			}
+
+			actual := out.String()
+			expected := string(expectedBytes)
+			if strings.Compare(expected, actual) != 0 {
+				t.Errorf("expected:\n\n%s\nbut got:\n\n%s\n", expected, actual)
+			}
+		})
+	}
+}

testdata/input/with-rule.txt

@@ -0,0 +1,3 @@
+./file1.yaml:4:5: [warning] comment not indented like content (comments-indentation)
+./file1.yaml:5:6: [error] wrong indentation: expected 4 but found 5 (indentation)
+./file2.yaml:7:5: [error] syntax error: expected <block end>, but found '<block mapping start>' (syntax)

testdata/input/without-rule.txt

@@ -0,0 +1,3 @@
+./file1.yaml:4:5: [warning] comment not indented like content
+./file1.yaml:5:6: [error] wrong indentation: expected 4 but found 5
+./file2.yaml:7:5: [error] syntax error: expected <block end>, but found '<block mapping start>'

testdata/output/with-rule.txt

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<checkstyle version="5.0">
+    <file name="./file1.yaml">
+        <error line="4" column="5" severity="warning" source="comments-indentation" message="comment not indented like content"></error>
+        <error line="5" column="6" severity="error" source="indentation" message="wrong indentation: expected 4 but found 5"></error>
+    </file>
+    <file name="./file2.yaml">
+        <error line="7" column="5" severity="error" source="syntax" message="syntax error: expected &lt;block end&gt;, but found &#39;&lt;block mapping start&gt;&#39;"></error>
+    </file>
+</checkstyle>

testdata/output/without-rule.txt

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<checkstyle version="5.0">
+    <file name="./file1.yaml">
+        <error line="4" column="5" severity="warning" message="comment not indented like content"></error>
+        <error line="5" column="6" severity="error" message="wrong indentation: expected 4 but found 5"></error>
+    </file>
+    <file name="./file2.yaml">
+        <error line="7" column="5" severity="error" message="syntax error: expected &lt;block end&gt;, but found &#39;&lt;block mapping start&gt;&#39;"></error>
+    </file>
+</checkstyle>