integration_test: Create helpers to initialize tests with custom indexes

[ahmetb]

Currently integration_test test cases for:

• krew index
• other krew cmds that test multi-index behavior

keep repeating the commands to create multiple indexes, such as:

	localIndex := test.TempDir().Path("index/" + constants.DefaultIndexName)
	test.Krew("index", "add", "foo", localIndex).RunOrFail()

Right now, this is achieved by doing test = NewTest(t).WithIndex() and aliasing the cloned default index directory into another index.

So perhaps we need to:

• modify: WithIndex() → WithDefaultIndex()
• add: WithDefaultIndexAlias(name string)

the last name could use improvement, like maybe WithCustomIndex.

This way the test author does not need to worry about where the custom index is coming from. Roughly related to #562.

/kind cleanup
/help
cc: @chriskim06
/area multi-index

[k8s-ci-robot]

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In response to this:

Currently integration_test test cases for:

• krew index
• other krew cmds that test multi-index behavior

keep repeating the commands to create multiple indexes, such as:

  localIndex := test.TempDir().Path("index/" + constants.DefaultIndexName)
  test.Krew("index", "add", "foo", localIndex).RunOrFail()

Right now, this is achieved by doing test = NewTest(t).WithIndex() and aliasing the cloned default index directory into another index.

So perhaps we need to:

• modify: WithIndex() → WithDefaultIndex()
• add: WithDefaultIndexAlias(name string)

the last name could use improvement, like maybe WithCustomIndex.

This way the test author does not need to worry about where the custom index is coming from. Roughly related to #562.

/kind cleanup
/help
cc: @chriskim06
/area multi-index

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[chriskim06]

/assign