refactoring tests to make this easier

lexer_test.go

@@ -6,7 +6,7 @@ import (
 	"code.ndumas.com/ndumas/wikilink-parser"
 )
 
-func Test_ObsidianWikilinks_LinksIntext(t *testing.T) {
+func Test_ObsidianWikilinks_LinksEndOfInput(t *testing.T) {
 	tcs := []struct {
 		name     string
 		in       string
@@ -14,7 +14,7 @@ func Test_ObsidianWikilinks_LinksIntext(t *testing.T) {
 	}{
 		{
 			name: "wikilink",
-			in:   "this is a [[wikilink]]",
+			in:   "[[wikilink]]",
 			expected: []wikilink.Lexeme{
 				{Typ: wikilink.LexText, Val: "this is a "},
 				{Typ: wikilink.LexOpenLink, Val: "[["},
@@ -25,7 +25,7 @@ func Test_ObsidianWikilinks_LinksIntext(t *testing.T) {
 		},
 		{
 			name: "wikilink|display name",
-			in:   "this is a [[wikilink|display name]]",
+			in:   "is a [[wikilink|display name]]",
 			expected: []wikilink.Lexeme{
 				{Typ: wikilink.LexText, Val: "this is a "},
 				{Typ: wikilink.LexOpenLink, Val: "[["},
@@ -457,33 +457,45 @@ func Test_ObsidianWikilinks_Basic(t *testing.T) {
 	}
 
 	for _, tc := range tcs {
-		tc := tc
-		t.Run(tc.name, func(t *testing.T) {
-			// t.Parallel()
-			l := wikilink.Lex("testLexer", tc.in)
-			defer l.L.Sync()
-			if len(tc.expected) != len(l.Items) {
-				t.Logf("expected %d tokens, got %d\n", len(tc.expected), len(l.Items))
+		mut, test := mutateTestCase(tc, "", "")
+		t.Run(mut.name, test)
+	}
+}
+
+type tc struct {
+	name     string
+	in       string
+	expected []wikilink.Lexeme
+}
+
+func mutateTestCase(tc tc, prefix, suffix string) (tc, func(t *testing.T)) {
+	tc.in = prefix + tc.in
+	tc.in = tc.in + suffix
+	return tc, func(t *testing.T) {
+		// t.Parallel()
+		l := wikilink.Lex("testLexer", tc.in)
+		defer l.L.Sync()
+		if len(tc.expected) != len(l.Items) {
+			t.Logf("expected %d tokens, got %d\n", len(tc.expected), len(l.Items))
+			t.Fail()
+
+			return
+		}
+		for i, e := range tc.expected {
+			n := l.Items[i]
+			if e.Typ != n.Typ {
+				t.Logf("expected Type %s, received %s", e.Typ.String(), n.Typ.String())
 				t.Fail()
 
 				return
 			}
-			for i, e := range tc.expected {
-				n := l.Items[i]
-				if e.Typ != n.Typ {
-					t.Logf("expected Type %s, received %s", e.Typ.String(), n.Typ.String())
-					t.Fail()
 
-					return
-				}
-
-				if e.Val != n.Val {
-					t.Logf("expected Value %q, received %q", e.Val, n.Val)
-					t.Fail()
+			if e.Val != n.Val {
+				t.Logf("expected Value %q, received %q", e.Val, n.Val)
+				t.Fail()
 
-					return
-				}
+				return
 			}
-		})
+		}
 	}
 }