Add unit tests for imageParts

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

Closes: #1112
Approved by: rhatdan

libpod/image/parts_test.go

@@ -0,0 +1,69 @@
+package image
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDecompose(t *testing.T) {
+	const digestSuffix = "@sha256:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
+
+	for _, c := range []struct {
+		input                          string
+		transport, registry, name, tag string
+		isTagged, hasRegistry          bool
+		assembled                      string
+		assembledWithTransport         string
+	}{
+		{"#", "", "", "", "", false, false, "", ""}, // Entirely invalid input
+		{ // Fully qualified docker.io, name-only input
+			"docker.io/library/busybox", "docker://", "docker.io", "library/busybox", "latest", false, true,
+			"docker.io/library/busybox:latest", "docker://docker.io/library/busybox:latest",
+		},
+		{ // Fully qualified example.com, name-only input
+			"example.com/ns/busybox", "docker://", "example.com", "ns/busybox", "latest", false, true,
+			"example.com/ns/busybox:latest", "docker://example.com/ns/busybox:latest",
+		},
+		{ // Unqualified single-name input
+			"busybox", "docker://", "", "busybox", "latest", false, false,
+			// FIXME? The [empty]/busybox syntax is surprising.
+			"/busybox:latest", "docker:///busybox:latest",
+		},
+		{ // Unqualified namespaced input
+			// FIXME: .registry == "ns" !!
+			"ns/busybox", "docker://", "ns", "busybox", "latest", false, true,
+			"ns/busybox:latest", "docker://ns/busybox:latest",
+		},
+		{ // name:tag
+			"example.com/ns/busybox:notlatest", "docker://", "example.com", "ns/busybox", "notlatest", true, true,
+			"example.com/ns/busybox:notlatest", "docker://example.com/ns/busybox:notlatest",
+		},
+		{ // name@digest
+			// FIXME? .tag == "none"
+			"example.com/ns/busybox" + digestSuffix, "docker://", "example.com", "ns/busybox", "none", false, true,
+			// FIXME: this drops the digest and replaces it with an incorrect tag.
+			"example.com/ns/busybox:none", "docker://example.com/ns/busybox:none",
+		},
+		{ // name:tag@digest
+			"example.com/ns/busybox:notlatest" + digestSuffix, "docker://", "example.com", "ns/busybox", "notlatest", true, true,
+			// FIXME: This drops the digest
+			"example.com/ns/busybox:notlatest", "docker://example.com/ns/busybox:notlatest",
+		},
+	} {
+		parts, err := decompose(c.input)
+		if c.transport == "" {
+			assert.Error(t, err, c.input)
+		} else {
+			assert.NoError(t, err, c.input)
+			assert.Equal(t, c.transport, parts.transport, c.input)
+			assert.Equal(t, c.registry, parts.registry, c.input)
+			assert.Equal(t, c.name, parts.name, c.input)
+			assert.Equal(t, c.tag, parts.tag, c.input)
+			assert.Equal(t, c.isTagged, parts.isTagged, c.input)
+			assert.Equal(t, c.hasRegistry, parts.hasRegistry, c.input)
+			assert.Equal(t, c.assembled, parts.assemble(), c.input)
+			assert.Equal(t, c.assembledWithTransport, parts.assembleWithTransport(), c.input)
+		}
+	}
+}