ci(test): update CI tests to cover gno test default directory behavior

gnovm/cmd/gno/testdata/test/no_path_empty_dir.txtar

@@ -0,0 +1,6 @@
+# Run gno test without path argument on an empty dir 
+
+gno test
+
+! stdout .+
+stderr '[no test files]'

gnovm/cmd/gno/testdata/test/no_path_empty_gno.txtar

@@ -0,0 +1,8 @@
+# Test empty gno without path argument
+
+gno test
+
+! stdout .+
+stderr '\?       \. 	\[no test files\]'
+
+-- empty.gno --

gnovm/cmd/gno/testdata/test/no_path_flag_run.txtar

@@ -0,0 +1,99 @@
+# Run test on gno.land/p/demo/ufmt without path argument
+
+gno test
+
+gno test -v 
+
+! stdout .+
+stderr '=== RUN   TestRun/hello'
+stderr '=== RUN   TestRun/hi_you'
+stderr '=== RUN   TestRun/hi_me'
+stderr '=== RUN   TestRun'
+stderr '--- PASS: TestRun'
+
+gno test -v -run .*
+
+! stdout .+
+stderr '=== RUN   TestRun/hello'
+stderr '=== RUN   TestRun/hi_you'
+stderr '=== RUN   TestRun/hi_me'
+stderr '=== RUN   TestRun'
+stderr '--- PASS: TestRun'
+
+gno test -v -run NotExists
+
+! stdout .+
+! stderr '=== RUN   TestRun'
+
+gno test -v -run .*/hello
+
+! stdout .+
+stderr '=== RUN   TestRun/hello'
+! stderr '=== RUN   TestRun/hi_you'
+! stderr '=== RUN   TestRun/hi_me'
+stderr '=== RUN   TestRun'
+stderr '--- PASS: TestRun'
+
+gno test -v -run .*/hi
+
+! stdout .+
+! stderr '=== RUN   TestRun/hello'
+stderr '=== RUN   TestRun/hi_you'
+stderr '=== RUN   TestRun/hi_me'
+stderr '=== RUN   TestRun'
+stderr '--- PASS: TestRun'
+
+gno test -v -run .*/NotExists
+
+! stdout .+
+stderr '=== RUN   TestRun'
+stderr '--- PASS: TestRun'
+
+gno test -v -run Run/.*
+
+! stdout .+
+stderr '=== RUN   TestRun/hello'
+stderr '=== RUN   TestRun/hi_you'
+stderr '=== RUN   TestRun/hi_me'
+stderr '=== RUN   TestRun'
+stderr '--- PASS: TestRun'
+
+gno test -v -run Run/
+
+! stdout .+
+stderr '=== RUN   TestRun/hello'
+stderr '=== RUN   TestRun/hi_you'
+stderr '=== RUN   TestRun/hi_me'
+stderr '=== RUN   TestRun'
+stderr '--- PASS: TestRun'
+
+gno test -v -run Run/hello
+
+! stdout .+
+stderr '=== RUN   TestRun/hello'
+! stderr '=== RUN   TestRun/hi_you'
+! stderr '=== RUN   TestRun/hi_me'
+stderr '=== RUN   TestRun'
+stderr '--- PASS: TestRun'
+
+-- run.gno --
+package run
+
+-- run_test.gno --
+package run
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestRun(t *testing.T) {
+	cases := []string {
+		"hello",
+		"hi you",
+		"hi me",
+	}
+	for _, tc := range cases {
+		t.Run(tc, func(t *testing.T) {})
+	}
+}

gnovm/cmd/gno/testdata/test/no_path_valid_filetest.txtar

@@ -0,0 +1,26 @@
+# Test with a valid _filetest.gno file
+
+gno test
+
+! stdout .+
+stderr 'ok      \. 	\d\.\d\ds'
+
+gno test -v
+
+stdout 'test'
+stderr '=== RUN   file/valid_filetest.gno'
+stderr '--- PASS: file/valid_filetest.gno \(\d\.\d\ds\)'
+stderr 'ok      \. 	\d\.\d\ds'
+
+-- valid.gno --
+package valid
+
+-- valid_filetest.gno --
+package main
+
+func main() {
+	println("test")
+}
+
+// Output:
+// test

gnovm/cmd/gno/testdata/test/no_path_valid_test.txtar

@@ -0,0 +1,18 @@
+# Test with a valid _test.gno file without path argument
+
+gno test
+
+! stdout .+ 
+stderr 'ok      \. 	\d\.\d\ds'
+
+-- valid.gno --
+package valid
+
+-- valid_test.gno --
+package valid
+
+import "testing"
+
+func TestAlwaysValid(t *testing.T) {
+	// noop
+}