Add testdata where steps are prefixes of other steps

testdata/good/prefixed-keywords.feature

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+# language: ht
+Karakteristik: Keywords can be a prefix of another
+  Some times keywords are a prefix of another keyword.
+  In this scenario the parser should prefer the longest keyword.
+
+  Senaryo: Erasing agent memory
+    Sipoze ke there is agent J
+    Ak there is agent K
+    Le I erase agent K's memory
+    Le sa a there should be agent J
+    Men there should not be agent K

testdata/good/prefixed-keywords.feature.ast.ndjson

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+{"gherkinDocument": {"comments": [], "feature": {"children": [{"scenario": {"description": "", "examples": [], "id": "5", "keyword": "Senaryo", "location": {"column": 3, "line": 6}, "name": "Erasing agent memory", "steps": [{"id": "0", "keyword": "Sipoze ke ", "keywordType": "Context", "location": {"column": 5, "line": 7}, "text": "there is agent J"}, {"id": "1", "keyword": "Ak ", "keywordType": "Conjunction", "location": {"column": 5, "line": 8}, "text": "there is agent K"}, {"id": "2", "keyword": "Le ", "keywordType": "Action", "location": {"column": 5, "line": 9}, "text": "I erase agent K's memory"}, {"id": "3", "keyword": "Le sa a ", "keywordType": "Outcome", "location": {"column": 5, "line": 10}, "text": "there should be agent J"}, {"id": "4", "keyword": "Men ", "keywordType": "Conjunction", "location": {"column": 5, "line": 11}, "text": "there should not be agent K"}], "tags": []}}], "description": "  Some times keywords are a prefix of another keyword.\n  In this scenario the parser should prefer the longest keyword.", "keyword": "Karakteristik", "language": "ht", "location": {"column": 1, "line": 2}, "name": "Keywords can be a prefix of another", "tags": []}, "uri": "../testdata/good/prefixed-keywords.feature"}}

testdata/good/prefixed-keywords.feature.pickles.ndjson

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+{"pickle": {"astNodeIds": ["5"], "id": "11", "language": "ht", "name": "Erasing agent memory", "steps": [{"astNodeIds": ["0"], "id": "6", "text": "there is agent J", "type": "Context"}, {"astNodeIds": ["1"], "id": "7", "text": "there is agent K", "type": "Context"}, {"astNodeIds": ["2"], "id": "8", "text": "I erase agent K's memory", "type": "Action"}, {"astNodeIds": ["3"], "id": "9", "text": "there should be agent J", "type": "Outcome"}, {"astNodeIds": ["4"], "id": "10", "text": "there should not be agent K", "type": "Outcome"}], "tags": [], "uri": "../testdata/good/prefixed-keywords.feature"}}

testdata/good/prefixed-keywords.feature.source.ndjson

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+{"source": {"data": "# language: ht\nKarakteristik: Keywords can be a prefix of another\n  Some times keywords are a prefix of another keyword.\n  In this scenario the parser should prefer the longest keyword.\n\n  Senaryo: Erasing agent memory\n    Sipoze ke there is agent J\n    Ak there is agent K\n    Le I erase agent K's memory\n    Le sa a there should be agent J\n    Men there should not be agent K\n", "mediaType": "text/x.cucumber.gherkin+plain", "uri": "../testdata/good/prefixed-keywords.feature"}}

testdata/good/prefixed-keywords.feature.tokens

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+(1:1)Language:/ht/
+(2:1)FeatureLine:()Karakteristik/Keywords can be a prefix of another/
+(3:1)Other:/  Some times keywords are a prefix of another keyword./
+(4:1)Other:/  In this scenario the parser should prefer the longest keyword./
+(5:1)Other://
+(6:3)ScenarioLine:()Senaryo/Erasing agent memory/
+(7:5)StepLine:(Context)Sipoze ke /there is agent J/
+(8:5)StepLine:(Conjunction)Ak /there is agent K/
+(9:5)StepLine:(Action)Le /I erase agent K's memory/
+(10:5)StepLine:(Outcome)Le sa a /there should be agent J/
+(11:5)StepLine:(Conjunction)Men /there should not be agent K/
+EOF