[TESTS] Truncate some long test names, for readability

The strings produced by these tests can run to thousands of characters,
which makes test logs difficult to read.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

model/labels/regexp_test.go

@@ -100,7 +100,7 @@ func TestFastRegexMatcher_MatchString(t *testing.T) {
 		r := r
 		for _, v := range testValues {
 			v := v
-			t.Run(r+` on "`+v+`"`, func(t *testing.T) {
+			t.Run(readable(r)+` on "`+readable(v)+`"`, func(t *testing.T) {
 				t.Parallel()
 				m, err := NewFastRegexMatcher(r)
 				require.NoError(t, err)
@@ -111,6 +111,14 @@ func TestFastRegexMatcher_MatchString(t *testing.T) {
 	}
 }
 
+func readable(s string) string {
+	const maxReadableStringLen = 40
+	if len(s) < maxReadableStringLen {
+		return s
+	}
+	return s[:maxReadableStringLen] + "..."
+}
+
 func TestOptimizeConcatRegex(t *testing.T) {
 	cases := []struct {
 		regex    string

promql/parser/parse_test.go

@@ -3696,9 +3696,17 @@ func makeInt64Pointer(val int64) *int64 {
 	return valp
 }
 
+func readable(s string) string {
+	const maxReadableStringLen = 40
+	if len(s) < maxReadableStringLen {
+		return s
+	}
+	return s[:maxReadableStringLen] + "..."
+}
+
 func TestParseExpressions(t *testing.T) {
 	for _, test := range testExpr {
-		t.Run(test.input, func(t *testing.T) {
+		t.Run(readable(test.input), func(t *testing.T) {
 			expr, err := ParseExpr(test.input)
 
 			// Unexpected errors are always caused by a bug.