refactor: move common io-related functions into new file

plugins/common/io_test.go

@@ -0,0 +1,28 @@
+
+import "testing"
+
+func TestCommonFileToSlice(t *testing.T) {
+	RegisterTestingT(t)
+	Expect(setupTestApp()).To(Succeed())
+	lines, err := FileToSlice(testEnvFile)
+	Expect(err).NotTo(HaveOccurred())
+	Expect(lines).To(Equal([]string{testEnvLine}))
+	teardownTestApp()
+}
+
+func TestCommonFileExists(t *testing.T) {
+	RegisterTestingT(t)
+	Expect(setupTestApp()).To(Succeed())
+	Expect(FileExists(testEnvFile)).To(BeTrue())
+	teardownTestApp()
+}
+
+func TestCommonReadFirstLine(t *testing.T) {
+	RegisterTestingT(t)
+	line := ReadFirstLine(testEnvFile)
+	Expect(line).To(Equal(""))
+	Expect(setupTestApp()).To(Succeed())
+	line = ReadFirstLine(testEnvFile)
+	Expect(line).To(Equal(testEnvLine))
+	teardownTestApp()
+}