test: start on the test suite

See https://git.vvvvvvaria.org/decentral1se/distribusi-go/issues/6

distribusi.go

@@ -564,24 +564,16 @@ func getCaption(c *cli.Context, fpath string) (string, error) {
 }
 
 // parseMtype parses a mimetype string to simplify programmatic type lookups.
-func parseMtype(mtype string) (string, string) {
-	stripCharset := strings.Split(mtype, ";")
-	splitTypes := strings.Split(stripCharset[0], "/")
-
-	ftype, stype := splitTypes[0], splitTypes[1]
-
-	return ftype, stype
-}
-
-// sliceContains checks if an element is present in a list.
-func sliceContains(items []string, target string) bool {
-	for _, item := range items {
-		if item == target {
-			return true
-		}
+func parseMtype(mtype string) (string, string, error) {
+	if !strings.Contains(mtype, "/") {
+		return "", "", fmt.Errorf("unable to parse %s", mtype)
 	}
 
-	return false
+	stripCharset := strings.Split(mtype, ";")
+	splitTypes := strings.Split(stripCharset[0], "/")
+	ftype, stype := splitTypes[0], splitTypes[1]
+
+	return ftype, stype, nil
 }
 
 // trimFinalNewline trims newlines from the end of bytes just read from files.
@@ -604,7 +596,10 @@ func mkHref(c *cli.Context, fpath string, mtype string) (bool, string, error) {
 	var unknown bool
 
 	fname := filepath.Base(fpath)
-	ftype, stype := parseMtype(mtype)
+	ftype, stype, err := parseMtype(mtype)
+	if err != nil {
+		return unknown, href, err
+	}
 
 	if ftype == "text" {
 		fcontents, err := os.ReadFile(fpath)
@@ -680,7 +675,10 @@ func mkDiv(c *cli.Context, mtype string, href, fname string, unknown bool) (stri
 
 	filename := fmt.Sprintf("<span class='filename'>%s</span>", fname)
 
-	ftype, stype := parseMtype(mtype)
+	ftype, stype, err := parseMtype(mtype)
+	if err != nil {
+		return div, err
+	}
 
 	if ftype == "text" {
 		divTemplate = "<div id=\"%s\" class='%s'>%s%s</div>"

distribusi_test.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestTrimFinalNewline(t *testing.T) {
+	trimmed := trimFinalNewline([]byte("foo\n"))
+	if trimmed != "foo" {
+		t.Fatalf("failed to trimmed new line from 'foo\\n'")
+	}
+}
+
+func TestTrimAllNewlines(t *testing.T) {
+	trimmed := trimAllNewlines("\nfoo\n")
+	if trimmed != "foo" {
+		t.Fatalf("failed to trimmed new line from '\\nfoo\\n'")
+	}
+}
+
+func TestParseMtype(t *testing.T) {
+	mtype := "os/directory"
+	ftype, stype, err := parseMtype(mtype)
+	if ftype != "os" || stype != "directory" {
+		t.Fatalf("unable to parse %s", mtype)
+	}
+
+	mtype = "image/gif; charset=utf-8"
+	ftype, stype, err = parseMtype(mtype)
+	if err != nil {
+		t.Fatalf("failed to parse %s", mtype)
+	}
+	if ftype != "image" || stype != "gif" {
+		t.Fatalf("unable to parse %s", mtype)
+	}
+
+	mtype = "notamimetype"
+	ftype, stype, err = parseMtype(mtype)
+	if err == nil {
+		t.Fatalf("failed to error out correctly parsing %s", mtype)
+	}
+}
+
+func TestGetLogFile(t *testing.T) {
+	f, err := getLogFile()
+	if err != nil {
+		t.Fatalf("failed to create log file, saw: %s", err)
+	}
+
+	if !strings.Contains(f.Name(), "distribusi-go") {
+		t.Fatalf("log file named incorrectly: %s", f.Name())
+	}
+
+	absPath, err := filepath.Abs(f.Name())
+	if err != nil {
+		t.Fatalf("failed to read absoluate path of %s", f.Name())
+	}
+
+	if err := os.Remove(absPath); err != nil {
+		t.Fatalf("unable to remove %s", absPath)
+	}
+}