stream/mts/psi/descriptor_test.go: added comments to test funcs - as well as some todos for further testing.

stream/mts/psi/descriptor_test.go

@@ -127,6 +127,10 @@ var (
 	}
 )
 
+// TestHasDescriptorExists checks that PSIBytes.HasDescriptor performs as expected
+// when the PSI we're interested in has the descriptor of interest. HasDescriptor
+// should return the descriptor bytes.
+// TODO: HasDescriptor also returns index of descriptor - we should check this.
 func TestHasDescriptorExists(t *testing.T) {
 	p := PSIBytes(tstPsi3.Bytes())
 	_, got := p.HasDescriptor(LocationDescTag)
@@ -140,6 +144,10 @@ func TestHasDescriptorExists(t *testing.T) {
 	}
 }
 
+// TestHasDescriptorAbsent checks that PSIBytes.HasDescriptor performs as expected
+// when the PSI does not have the descriptor of interest. HasDescriptor should
+// return a nil slice and a negative index.
+// TODO: check index here as well.
 func TestHasDescriptorAbsent(t *testing.T) {
 	p := PSIBytes(tstPsi3.Bytes())
 	const fakeTag = 236
@@ -150,6 +158,10 @@ func TestHasDescriptorAbsent(t *testing.T) {
 	}
 }
 
+// TestHasDescriptorNone checks that PSIBytes.HasDescriptor behaves as expected
+// when the PSI does not have any descriptors. HasDescriptor should return a nil
+// slice.
+// TODO: again check index here.
 func TestHasDescriptorNone(t *testing.T) {
 	p := PSIBytes(tstPsi2.Bytes())
 	_, got := p.HasDescriptor(LocationDescTag)
@@ -159,6 +171,8 @@ func TestHasDescriptorNone(t *testing.T) {
 	}
 }
 
+// TestProgramInfoLen checks that PSIBytes.ProgramInfoLen correctly extracts
+// the program info length from a PSI.
 func TestProgramInfoLen(t *testing.T) {
 	p := PSIBytes(tstPsi1.Bytes())
 	got := p.ProgramInfoLen()
@@ -168,6 +182,8 @@ func TestProgramInfoLen(t *testing.T) {
 	}
 }
 
+// TestDescriptors checks that PSIBytes.descriptors correctly returns the descriptors
+// from a PSI when descriptors exist.
 func TestDescriptors(t *testing.T) {
 	p := PSIBytes(tstPsi1.Bytes())
 	got := p.descriptors()
@@ -181,6 +197,8 @@ func TestDescriptors(t *testing.T) {
 	}
 }
 
+// TestDescriptors checks that PSIBYtes.desriptors correctly returns nil when
+// we try to get descriptors from a psi without any descriptors.
 func TestDescriptorsNone(t *testing.T) {
 	p := PSIBytes(tstPsi2.Bytes())
 	got := p.descriptors()
@@ -190,6 +208,8 @@ func TestDescriptorsNone(t *testing.T) {
 	}
 }
 
+// TestCreateDescriptorEmpty checks that PSIBytes.createDescriptor correctly adds
+// a descriptor to the descriptors list in a PSI when it has no descriptors already.
 func TestCreateDescriptorEmpty(t *testing.T) {
 	got := PSIBytes(tstPsi2.Bytes())
 	got.createDescriptor(TimeDescTag, make([]byte, TimeDataSize))
@@ -200,6 +220,9 @@ func TestCreateDescriptorEmpty(t *testing.T) {
 	}
 }
 
+// TestCreateDescriptorNotEmpty checks that PSIBytes.createDescriptor correctly adds
+// a descriptor to the descriptors list in a PSI when it already has one with
+// a different tag.
 func TestCreateDescriptorNotEmpty(t *testing.T) {
 	got := PSIBytes(tstPsi1.Bytes())
 	got.createDescriptor(LocationDescTag, make([]byte, LocationDataSize))
@@ -210,6 +233,8 @@ func TestCreateDescriptorNotEmpty(t *testing.T) {
 	}
 }
 
+// TestAddDescriptorEmpty checks that PSIBytes.AddDescriptor correctly adds a descriptor
+// when there are no other descriptors present in the PSI.
 func TestAddDescriptorEmpty(t *testing.T) {
 	got := PSIBytes(tstPsi2.Bytes())
 	if err := got.AddDescriptor(TimeDescTag, make([]byte, TimeDataSize)); err != nil {
@@ -221,6 +246,8 @@ func TestAddDescriptorEmpty(t *testing.T) {
 	}
 }
 
+// TestAddDescriptorNonEmpty checks that PSIBytes.AddDescriptor correctly adds a
+// descriptor when there is already a descriptor of a differing type in a PSI.
 func TestAddDescriptorNonEmpty(t *testing.T) {
 	got := PSIBytes(tstPsi1.Bytes())
 	if err := got.AddDescriptor(LocationDescTag, make([]byte, LocationDataSize)); err != nil {
@@ -231,3 +258,5 @@ func TestAddDescriptorNonEmpty(t *testing.T) {
 		t.Errorf(errNotExpectedOut, got, want)
 	}
 }
+
+// TODO: check that we can update descriptor with AddDescriptor